A series of new Ni(II) poly-phosphinates have been synthesised using Ni(II) acetylacetonate as nickel precursor and a succession of ligands derived from phosphinic acid: ethyl-butyl-phosphinic acid, ethyl-butyl-thio-phosphinic acid, and respectively ethylbutyl-di-thio-phosphinic acid. Chemical analysis gel-chromatography, infrared spectroscopy (IR), spin electronic resonance (RES), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), electrical resistance measurements at different temper...
Autori: Daniel Sutiman, Doina Sibiescu, , Mircea Teodor Nechita
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25118

AbstractThe corrosion behaviour of three commercial nickel-chromium based dental materials was investigated by electrochemical methods in a corroding mixture of sodium chloride, oxalic acid and lactic acid. In order to establish electrochemical parameters of the corrosion process, linear and cyclic polarization curves were plotted. The samples performances in the corroding system were investigated by weight loss, pH and electrical conductivity measurements. The quantitative analysis related with...
Autori: , Daniel Mareci, Daniel Sutiman, Mircea Teodor Nechita
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25132

AbstractCatalysts having mobile electrons in bulk such as metals and semiconductors are good solid materials for red/ox type of reaction (oxidation) and can be effectively used in gas sensing devices as well. The aims of this work were: (i) to investigate the surface behavior of Pt(0.28%)/Al2O3 and SnO2(2.94%)-Pt(0.28%)/Al2O3 samples in inert atmosphere (He) and in reducing atmosphere containing helium-cyclopropane gas mixture under ambient condition (i.e., room temperature, atmospheric pressure...
Autori: , Cornel Munteanu, Jozsef Kovacs, Mariana Scurtu, Monica Caldararu, Tatiana Yuzhakova
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25146

AbstractIn this paper, the application of the heterogeneous photocatalysis in degradation of a cationic copper phtalocyanine dye, used as model of persistent organic compound is investigated by assessing the efficiency of the process. The influence of hydrogen peroxide on the photocatalytic process is studied using two types of commercial catalysts, such as TiO2 Degussa (88% anatase, 20% rutile) and TiONa Millennium (100% anatase). Another electron acceptor, FeCl3 is also used for investigation ...
Autori: Anca Florentina Caliman, , , Ioannis Poulios, Maria Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25211

AbstractThe aim of this work was to obtain Ag - doped zeolite as antibacterial material using natural and sodium form of zeolite from Mirsid Romania with the dimensions ranged between 0.8-1.2 mm. The comparative structural characterization of natural and Ag - doped zeolite were performed using Laser Induced Breakdown Spectroscopy (LIBS), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and Infrared Spectroscopy (IR). In addition, the ion exchange total ...
Autori: Aurel Iovi, Corina Orha, Cornelia Ratiu, Florica Manea, Georgeta Burtica
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25220

AbstractThis paper discusses the applications of synthetic PONILIT GT-2 anionic polyelectrolyte as soil conditioning agent into a site with high electric field around. All experimental data conclude that the use of a polymeric conditioning agent was increased the soil ability to support vegetation expressed as germination degree for some grass species (e.g., Raigras aristat). The performed values for germination degree increase from 3.05 % to 12.20 % when was added fertilized soil, and respectiv...
Autori: Carmen Zaharia, Ioan Ivanov Dospinescu, Matei Macoveanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25225

AbstractPolycyclic aromatic hydrocarbons (PAHs) and organochlorine pesticides (OCPs) contamination levels were determined in the water samples of Danube river (two sites in Romanian area), of one Romanian spring water (Pelisor), in tap water (from Constantza and from Borovetz) and sea water (the Black Sea and the Mediteranean Sea). These levels were compared to those available for other surface waters. The studied water samples were analyzed by gas chromatography with mass spectrometer detector ...
Autori: Alina Soceanu, , Simona Dobrinas, Valentina Coatu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25237

AbstractThe crystallization of ferrierite/ZSM-35 zeolite at 180 Âą 50C in the presence of ethylenediamine as a structure-directing agent from reaction mixtures containing various active NaOH/SiO2 ratios has been studied. X-ray diffraction, scanning electron microscopy, TG/DTG/DSC analysis, nitrogen sorption measurements and temperature-programmed ammonia desorption were used to characterize the ferrierite/ZSM-35 solids. The XRD data reveal that the samples synthesized in optimized conditions are...
Autori: Ioana Droahna, Iuliean Asaftei, Nicolae Bilba
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25251

AbstractZeolites Cs+, Na+-chabazite with SiO2 /Al2O3 ratio of 7 were prepared from gels with molar composition (2.41-2.73)(Cs+ + Na+)2O : (0.02 TPAOH) : Al2O3 : 7.21 SiO2 : (194-204) H2O in static hydrothermal conditions at 108 – 132 0C for 8-21 days. The solids were characterized by X - ray diffraction, scanning electron microscopy, thermal analysis and nitrogen sorption measurements. The nitrogen sorption isotherms at -1960C present a hysteresis loop which is indicative for the existence of ...
Autori: Ionela Droahna, Iuliean Asaftei, Nicolae Bilba
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25266

AbstractThe corrosion resistance of three types of low-carbon steels in water-contaminated mixtures of adipic acid and methanol was investigated. The concentration of water in the organic mixture was progressively raised from 1% to 5%, while the carbon concentration in the steel samples varied from 2% to 4%. Infrared spectroscopy (IR) and X-ray diffraction (XRD) were used to investigate the insoluble corrosion products. Based on the weight losses measurements, on the polarization curves and on t...
Autori: Adrian Cailean, Daniel Mareci, Daniel Sutiman, Mircea Teodor Nechita
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25287

AbstractIn the present work, composite membranes were developed for separation of hydrogen from its mixtures with other gases. The composite membranes were characterized by single gas permeation and scanning electron microscopy. Gas transport properties have been determined for four gases (H2, CH4, N2, CO2). The influence of cross-linking on transport was measured. H2/CH4 selectivity values up to 115 were obtained. The resulting membranes have a selectivity of H2/CH4 close to intrinsic selectivi...
Autori: Carmen Nistor, Marcel Popa, Sergey Shishatskiy, Suzana Pereira Nunes
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25339

AbstractThis paper presents an analysis of the levels of electromagnetic fields caused by cellular base stations or mobile phones, measured in some residential areas. A statistical processing of the data has also been done in order to estimate both the short-term and the long-term variability of the fields caused by cellular base stations in some apartments and on the terraces of the apartment buildings at tens or hundreds of meters distance from the antenna systems. In some places, comparative ...
Autori: Alexandru Salceanu, Ionut Nica, Valeriu David
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25381

Abstract This paper presents the preliminary results of photocatalytic oxidation of humic acid from water using two types of catalysts, i.e., TiO2 and Ag-doped TiO2 modified zeolite (TMZ and Ag-TMZ). TMZ and Ag-TMZ, with zeolite granulation of 315-500 ?Źm was synthesized by sol-gel method, and the morphology and composition of the unmodified/modified zeolite were characterized by BET (Brunauer–Emmet–Teller) method, X-ray Diffraction (XRD), scanning electron microscopy (SEM) and energy dis...
Autori: Cornelia Ratiu, Carmen Lazau, Paula Sfirloaga, Corina Orha, Daniela Sonea, Stefan Novaconi, Florica Manea, Georgeta Burtica, Ioan Grozescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25397

Abstract A facile and straightforward synthesis route, based on the anionic clay structural â€?memory effect??, has been used to obtain Fe2O3 or CeO2 supported on iron substituted hydrotalcite-like clay (FeLDH). The surface properties of the metal oxide / anionic clay ensembles were studies by X-ray photoelectron spectroscopy (XPS). After calcination at 550°C the derived mixed oxides were tested as new catalysts in the process of the selective catalytic reduction (SCR) of NOx using NH3...
Autori: Gabriela Carja, Sofronia Dranca, Elena Husanu, Irina Volf
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25413

Abstract Study of geopolymer is a developing field of research for capitalizing solid waste and by-products in the view of new materials achievement having characteristics necessary for using as cement substitute. Also, it provides a solution to many problems regarding environment, such as reduction of gaseous emissions and particles matter resulted from cement industry and raw materials economy. In this paper, the experimental conditions for obtaining new materials on the basis of fly ash f...
Autori: Maria Harja, , Maria Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25419

Abstract A crucial stage which makes the other directions of development of membrane processes is getting new membrane materials, to meet increasingly stringent of selectivity and productivity. Polyetheretherketone shows high stability against chemical and physical agents but is poorly soluble in most common solvents. Present studies on obtaining the support of the polyetheretherketone membranes were limited by: solubility of polyetheretherketone in concentrated sulfuric acid and fast speed a...
Autori: Mihaela Emanuela Craciun, Aurelia Cristina Nechifor, Florin Aldea, Gheorghe Nechifor
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25475

Abstract In order to improve the photo-efficiency of the electronic process as well as the response into the visible part of the spectrum, TiO2 doping with heavy metal (cadmium, cooper and nickel) have been employed. The objectives of this work are: (a) to prepare doped Me(Cd, Cu, Ni) TiO2 by doctor blade (DB) and spray pyrolysis deposition (SPD) techniques, (b) to characterize the catalysts, (c) to study and compare the activity of the Cd-TiO2, Cu-TiO2 and Ni-TiO2 catalysts on methyl orange ...
Autori: Luminita Andronic, Bianca Hristache, Alexandru Enesca, Anca Duta, Maria Visa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25480

AbstractWith a view to make a long term survey of the magnetic fields generated by the power line sources, appliances or, generally, by the low frequency magnetic field sources, a tri-axis magnetic field meter was proposed. Referring to the magnetic field sensor, both the characteristic proportional of the field strength and proportional to the time derivate of the field strength were considered. Thus, two active magnetic field meters working in 40 Hz ? 200 kHz frequency range were designed. In ...
Autori: Alexandru Salceanu, Ionut Nica, Liviu Breniuc, Valeriu David
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25507

Abstract The paper presents the surfactant-assisted solvo-thermal route to synthesize nanoparticles of cerium oxide with different shape and morphology. The precursor was calcined at 400°C for 4 h in order to obtain CeO2 nanoparticles. The obtained samples were characterized by means of thermal analysis and FTIR spectroscopy. The UV-Vis analysis was used to study the optical properties. The morphologies and nano-structures were characterized by scanning electron microscopy (SEM) and XRD. It...
Autori: Nicolae Apostolescu, Gabriela Carja, Gabriela Apostolescu, Elena Husanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25541

Abstract Geopolymerization is a continuous developing field of research for utilizing solid waste and by-products. It provides a solution to many problems where hazardous residue has to be treated and stored under critical environmental conditions. Consumption of fly ash in the manufacture of geopolymer is an important strategy in making materials more environmentally friendly. Fly ash has been chosen as a base material in order to utilize this industrial waste. Previous researches have show...
Autori: Maria Harja, Marinela Bărbuţă, Maria Gavrilescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25542

Abstract In this work the experimental conditions to synthesize, by direct hydrothermal synthesis, self-bonded pellets of ETS-10 phase containing iron were studied. The following gel composition was used: xNa2O-0.6KF-1.28xHCl-yFe2O3-0.2TiO2-1.49SiO2-39.5H2O with 0.8Â???xÂ???1.4 and 0.015Â???yÂ???0.08. The products obtained were characterized through X-ray diffraction on powders (XRD), thermal analysis (TG, DSC, DTG), scanning electron microscopy (SEM) and microanalysis (EDS). The data obtai...
Autori: Pierantonio De Luca, Danilo Vuono, Monica Filice
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25544

Abstract University campuses can be seen as â€?small cities’ due to their high population (students, professors, employees) and corresponding high traffic flow, which may have a significant impact on both environment and people health. The objective of this work was to analyze particulate matter seasonal trends in the university area of Cosenza (University of Calabria). The relationship between sources emission, meteorological parameters and particle properties was defined. Sampling was co...
Autori: Monica Filice, Pierantonio De Luca, Giuseppe Piero Guido
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25564

Abstract This work describes the preparation of a hydroxyapatite/polyurethane composite membrane and their characteristics. The porous hydroxyapatite/polyurethane composite membranes were made via solvent casting process. The deposited hydroxyapatite layers were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The data suggest that the method utilized in this work can be applied to obtain deposition of coating of crystalline hydroxyapatite on porous polyurethane...
Autori: Gabriela Ciobanu, Dorina Ignat, Gabriela Carja, Constantin Luca
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25572

Abstract When plants are exposed to heavy metals influence, the processes of growth inhibition, ion leakage of all membrane, distribution of pigment and even more death of plants are produced. The physiological and biochemical changes in germinating seedling and cultivation in plastic pots experiments of different plant species (maize, bean, oat, and spinach) were investigated under the influence of copper ions as stress agent. Differences between tolerances against copper excess in the case ...
Autori: Alina Stingu, Irina Volf, Valentin I. Popa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25578

Abstract The Schiff base N,N??(salicylidene)-methylenediamine, known as Salmen in combination with Cr(III) forms at pH = 4.5 a greenish precipitate, which is stable at room temperature but decomposed on heating. The study of the Infrared spectra, Electron Spin Resonance (ESR), X-ray diffraction and thermogravimetry has pointed out that the precipitation form is a complex, while the molar ratio showed that the combination rate of Cr(III): N,N?-bis(salicylidene)-methylenediamine is 1:1. The new...
Autori: Doina Sibiescu, Ioan Roşca, Irina Spatarescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25619

? Environmental Engineering and Management Journal, Vol. 9 Nr. 4 ? THE PROTECTION OF EQUIPMENTS USING VOLATILE INHIBITORS ? CONTINUOUS SURFACE TEMPERATURE MONITORING TO ESTIMATE SENSIBLE HEAT LOSS BY BUILDING FINISHES ? RECYCLE OF POLYAMIDE DYEING WASTEWATER FOLLOWING DECOLORIZATION WITH POLYMERIC SORBENTS ? PERFORMANCE EVALUATION OF AMINO ACID SALT-BASED COMPLEX ABSORBENTS FOR CO2 CAPTURE ? ADSORPTION EQUILIBRIUM STUDIES ON COPPER (II) IONS REMOVAL BY NATURAL WASTE USIN...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25666

? HYDROGEL MICROSPHERES BASED ON ENVIRONMENTALLY FRIENDLY POLYMERS WITH POTENTIAL BIOMEDICAL APPLICATIONS ? STUDY ON THE MIXING EFFICIENCY IN A BASKET BIOREACTOR WITH IMMOBILIZED YEASTS CELLS ? MANAGEMENT OF WASTE FROM ELECTRICAL AND ELECTRONIC EQUIPMENT IN CYPRUS ? A CASE STUDY ? SEPARATION AND CHARACTERIZATION OF ANTHOCYANINS BY ANALYTICAL AND ELECTROCHEMICAL METHODS ? AN INTEGRATED DECISION AID FOR IDENTIFYING AND PRIORITIZING STRATEGIES IN FOREST MANAGEMENT ? INFLUEN...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25668

Acidithiobacillus ferrooxidans plays an important role in the pyrite oxidation process and has been widely studied in order to determine the kinetics of the reactions, but the details of the oxidation processes on the surface of pyrite keeps poorly known. In this study, the bio-oxidation process of pyrite by Acidithiobacillus ferrooxidans was studied by comparing with abiotic oxidation by Fe3+. The attachment of Acidithiobacillus ferrooxidans on pyrite surface was found by using Scanning Electro...
Autori: Lei Jiang, Huiqun Yang, Yuruo Tao, Jinyan Yanghttp://www.ecozone.ro/reviste.php?RID=25686

A series of sodium bentonites as raw material were prepared to the modified inorganic iron-nickel montmorillonites and organic composite montmorillonites. The structural characterization and morphology of the iron-nickel crosslinked modified bentonites were observed by means of IR spectroscopy, X-ray diffraction, scanning electron microscopy. The effects of the amount of bentonites, adsorption time and pH change on the adsorption of Cr(VI) have also been studied. The results indicated that the a...
Autori: Shao Hong, Cao Ninghttp://www.ecozone.ro/reviste.php?RID=25695

Calcium zincate as an active material in Zn/Ni secondary battery has been successfully synthesized by microwave method. The sample was characterized by X-ray diffraction (XRD), thermogravimetric analysis, scanning electron microscope (SEM), chargedischarge test (CT) and cyclic voltammetry (CV) analysis. The results show that the chemical composition of sample is Ca(OH)2¡2Zn(OH)2¡2H2O with regular spherical shapes. The results from CV and CT measurement indicate that the battery has very high d...
Autori: Mengliang Tong, Xuanyan Liuhttp://www.ecozone.ro/reviste.php?RID=25700

Slag-Fly Ash Based cementitious material materials with high volume of fly ash and slag and less cement clinker was prepared, with low water requirement, well fluidity and with high strength, and can be used to the preparation of High Performance Concrete (HPC). When the W/C is 0.36, the 28d compressive strength is 58.93 Mpa, 28d flexural strength is 14.26 Mpa. By XRay diffraction analysis (XRD) and Scanning Electron Microscope (SEM) analysis, the results show that main materials in grinded samp...
Autori: Chenghong Fu, Wen Ni, Hui Wu, Mingyang Tianhttp://www.ecozone.ro/reviste.php?RID=25708

Abstract:Hybrid nanocomposites may synergistically combine and enhance the properties of inorganic nanoparticles and organicmolecules.The objective of this paper is to examine particular nanocomposites films based on binary copolymers and inorganic TiO2nanoparticles from the structure and properties point of view. These nanoparticles were dispersed in maleic anhydride-styrene(MAS) copolymer by using elaidic acid, trans isomer of the oleic acid, as coupling agent in order to increase the compatib...
Autori: Alina Matei, Dana Perniu, Ileana Cernica, Irina Popescu, Lucia Dumitrescu, Vasilica Schiopu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25755

Abstract:The aim of this work is to obtain sintered porous membranes with graded structure for microfiltration by sedimentation andsintering of metallic powders. Our previous studies have demonstrated the possibility of obtaining sintered porous materials withgraded structure by sedimentation. In this paper, spherical nickel particles were used having a grain size in the 2-90 Âľm rangemeasured by the laser scattering particle size analyzer. The powders were sedimented into a sintering die in a s...
Autori: Gyorgy Thalmaier, Ioan Vida-Simiti, Nicolaie Jumate, Niculina Sechel, Valentin Moldovan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25775

Abstract:The paper refers at adsorption studies using the maghemite nanoparticles as adsorbent for removal of the hexavalent chromium from aqueous synthetic solutions. Adsorption reached at equilibrium within 10 minutes and was registered as maximum at pH 2.54. The adsorption data were analyzed and fitted by Langmuir isotherm. Investigation methods for characterization of the nanoparticles were X-ray diffraction, scanning and transmission electron microscopy. Also, in order to evaluate the hexav...
Autori: Andra Mihaela Predescu, Andrei Predescu, , Eugeniu Vasile
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25805

This research investigates the influence of certain vitamins (A and D2) on the possibility of hydroxyapatite formation on polymer surfaces. A coating method based on biomimetic techniques was used to form a crystalline hydroxyapatite thin layer on porous polyurethane matrix. The method is based on a wet process of hydroxyapatite formation that involves porous polyurethane film soaking in a modified synthetic Simulated Body Fluid (SBF) solution. This modified SBF solution contains vitamin A and v...
Autori: Alina Costina Luca, Constantin Luca, Gabriela Ciobanu, Simona Ilisei
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25884

Fly ash and fly ash based zeolites are inorganics used for improving soil quality. In the current paper, the hydrothermal modification of fly ash was studied. Three methods have been employed for this purpose. The first method involved the use of an autoclave, where synthesis has been performed at a temperature of 120 0C and a treatment time of 4 to 8 hours. Within the second method, the modification of the ash at a temperature of 600 0C by fusion was carried-out. In this method, a mixture of as...
Autori: Corneliu Munteanu, Daniel Bucur, Lacramioara Rusu, Maria Harja, Marinela Barbuta, Ramona Carla Ciocinta
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25885

An alternative preparation method for PAC (pre-hydrolyzed aluminium chloride with general formula Alm(OH)nCl3n-m) by electrochemical synthesis is presented in this paper. The electrochemically obtained PAC (E-PAC), in which the most effective species of the polymeric Al component were estimated by 27Al RMN method, with properties similar to the properties of a commercially available PAC solution, was successfully generated in a electrochemical reactor. For obtaining as much as Al13 polymer by el...
Autori: Adina Pacala, Ciprian Radovan, Ilie Vlaicu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25901

The presence of pollutants in food raises some serious questions concerning their potential impact on consumers health, being necessary to monitor their distribution in the environment. The present work provides data regarding levels of organochlorine pesticides (lindane, p,p’- DDT, p,p’- DDE, p,p’- DDD, HCB, aldrin, dieldrin, endrin and hepthaclor) and PAHs: acenaphthene (Ace), acenaphthylene (Acy), fluorene (F), naphthalene (Np), anthracene (An), fluoranthene (Fl), phenanthrene (Ph), ben...
Autori: Alina Soceanu, Danut Tiberius Epure, Gabriela Stanciu, Simona Dobrinas, Viorica Popescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25905

AbstractIn this paper, we report a study on structural evolution, magnetic susceptibility and arsenic content of colloidal pyrite fromXinqiao deposits in Tongling, Anhui Province, China. The pyrite was treated under N2 atmosphere and charaterized with X-raypowder diffraction (XRD), field emission scanning electron microscopy (FE-SEM), magnetic susceptibility analysis, and atomicfluorescence spectroscopy (AFS). We observed that heating of colloidal pyrite in N2 atomosphere did not change the crys...
Autori: Dong Chen, Ping Li, Tianhu Chen, Xiao Zhu, Yadan Shi, Yan Yang
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25951

AbstractPolyvinyl alcohol (PVA) is a typical refractory organic pollutant with low biodegradability and high molecular weight. Thispaper presents data on the radiolysis of PVA in aqueous solutions by using ionizing radiation. Response surface methodologywith Box-Benhken design of experiment was applied to analyze the interactions among initial concentration of PVA, absorbeddose, and initial pH of aqueous solutions on PVA removal efficiency. 9.4-89.4% PVA was removed based on differentcombination...
Autori: Jianlong Wang, Jinping Tian, Lujun Chen, Shijun He, Weihua Sun
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25967

This special issue of EnvironmentalEngineering and Management Journal is dedicated tointerdisciplinary research and discusses multipleresults addressing environmental issues inElectromagnetic Compatibility (EMC) andEngineering in Medicine and Biology (EMB) areas.Some of the most significant researchdirections considered in this issue entail theelectromagnetic pollution together with a survey ofelectromagnetic environment in order to analyze andquantify the biological and health effects ofelectro...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25990

AbstractThe electrostatic discharge (ESD) event is a severe source of interference that can produce damages in any electronic system. Afull-body of an ESD generator is modeled using the Cadence IC 5.3 package software in order to reproduce the referencedischarge current assured by the standard specifications. The factors that introduce electromagnetic radiations into the systemshave also been investigated. Several tests based on proper matches between the parameters of the antenna were computed ...
Autori: Alexandru Salceanu, Ana-Maria Nicuta, Oana Beniuga, Paul Bicleanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25993

AbstractThe paper outlines a technique to mitigate the power frequency magnetic field produced in its vicinity by the transport anddistribution power lines. The technique consists in introduction below the line conductors of a passive loop of rectangular shape.Due to the induced currents in the rectangular frame, the total magnetic field below this structure is significantly reduced. Themethod’s efficiency depends by the line conductor’s configuration and also by the dimensions of the frame. The...
Autori: Călin Munteanu, Emil Merdan, Ioan T. Pop, Sorin Deleanu, Vasile Topa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=25994

AbstractIn this paper the synthesis, characterization and testing of composite material based on multi-wall carbon nanotubes and silverdopednatural zeolite (MWCNT-ZAg) has been investigated for humic acid (HA) adsorption. The surface characterization of thecomposite material has been investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM/ EDX) analysis.The Langmuir and Dubinin-Radushkevich (D-R) models fitted the best experimental data informing that adsorption process ofH...
Autori: Aniela Pop, Corina Orha, Florica Manea, Virgil Tiponut
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26023

AbstractPrinted circuit boards-PCBs are particularly rich in copper and precious metals. Recoveries of metals in our work started withtests for electrodeposition of Au, Ag and Cu from synthetic solutions on graphite and copper electrodes. Processes were studiedusing cyclic voltammetry in ranges: (-1200)-500 mV and (-800)-(-200) mV and (-400)-1400 mV. Different supportingelectrolytes like: H2SO4 0.5M, HCl 0.1M and HNO3 0.1M were used. Electrodeposition of studied metals from real solutions wasfol...
Autori: Adina Căta, Cristian Tănasie, Daniel Boc, Firuţa Fiţigau, Mariana Nela Stefănuţ, Paula Sfîrloagă, Raluca Pop, Zoltan Űrmösi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26036

AbstractWater quality is an inportant concern for the ecosystem state from a particular region. Since the continuous urban and economicdevelopment induces a negative impact on entire hydrological cycle, this study investigates the water quality of a Romanian lake,located in the Surduc area - Timis County. This perimeter has undergone significant economic development in the past twodecades due to increased tourism potential and the number of holiday residences.We proposed hybrid materias for the ...
Autori: Adina-Elena Segneanu, Cornelia Bandas, Florentina Cziple, Ioan Grozescu, Paula Sfîrloagă, Titus Slavici
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26040

AbstractWaste electrical and electronic equipment (WEEE, e-waste) represent the category of municipal waste with the fastest growthrate of the quantities generated particularly in developed countries. In Romania the WEEE management concerns have emergedrecently and the amount of information and data available is limited and sometimes irrelevant. In this case, studying the forcesthat influence WEEE management system directly or indirectly is useful for both the national and international stakehol...
Autori: Nadia Ciocoiu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26092

Abstract Poly(hydroxybutyrate) (PHB) is a biodegradable thermoplastic polyester with very high potential for industrial applications. The properties could be improved by mixing with another polymer, natural or synthetic, such as poly(vinyl alcohol) (PVA). The resulting polymer blends are potentially able to achieve the desired performance for different applications. Biodegradation modifies mechanical, physical and chemical properties of a given material. PHB are degraded by diverse...
Autori: Luiza Jecu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26111

Abstract This study focuses on the local scale behavior of SO2 emissions resulting from lignite-combustion thermal power plants. The investigations aimed at monitoring the SO2 emissions and imissions over a two week period in September 2010. One of the largest power plants from Eastern Europe was chosen for monitoring using different optoelectronic techniques. Rovinari power plant (44o54’45”N – 23o09’44”E) is one of the largest electricity suppliers of Romania, having 4 groups of 3...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26113

Abstract Waste recycling represents a very significant issue for the protection of our environment. Large waste quantities (slag and ashes) are products of the coal extraction industry and its subsequent combustion in thermal power stations. The possibilities of obtaining crystallized glasses in the CaO-Al2O3-Fe2O3-SiO2 system by introducing in the raw materials mixture ashes from Mintia Deva thermal power station have been studied. The physical and chemical characterization of the...
Autori: Firuţa Goga
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26121

Abstract The main purpose of this paper is to identify, highlight and analyze the recycling possibilities for the activated glass derived from the treatment of the cathode ray tubes (CRT) waste equipment and to demonstrate the recycling viability, economical and environment protection efficiency. A total of 95 pieces of waste electronic equipments (TVs and PC monitors) were processed and a number of five TVs and five PC monitors from the ‘95s were analyzed. Significant quantitie...
Autori: Antoanela Popovici
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26124

AbstractThis paper analyzes spatial effect of urbanization level, land use efficiency and their coordinative development degree of Xinjiangfrom 1995 to 2010 based on Exploratory Spatial Data Analysis and coordinative development degree model. It was found that the urbanization level and land use efficiency take on apparent spatial agglomeration. The hot spots concentrate mainly in the north slope of Tianshan Mountain and the corridor along South Xinjiang railway, and the cold spots distribute ma...
Autori: Yuanjing Qi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26167

AbstractThermal behaviour, microstructure and mechanical properties of the clay polluted by acidic and alkaline pollutants wereinvestigated by thermogravimetric/differential thermal analysis (TG-DTA), scanning electronic microscope (SEM), mercuryintrusion experiments, permeability coefficient and unconfined compressive strength tests. The clay polluted by alkaline solutionpresented distinct exothermic peaks at 304-310oC, while it’s not observed for the one polluted by acidic solution due to thed...
Autori: Zhao Ying
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26182

AbstractGallinaceous feathers are an abundant solid waste from the poultry processing industries, which poses disposal problems. Akinetic study dealing with the adsorption process of wool reactive dye, Yellow Lanasol 4G (CI Reactive Yellow 39), ongallinaceous (Gallus gallus, Cobb 500) feathers was carried out. The main research goals of this work were to evaluate theviability of using this waste as adsorbent and to study the kinetics of the adsorption process, using a synthetic effluent. Thechar...
Autori: Sónia Adriana Figueiredo
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26203

AbstractThe reuse of a wastewater treatment system was investigated using intermittent media infiltration (IMI) to evaluate the fecalcoliform (FC) removal efficiency with natural zeolite containing clinoptilolite from the state of San Luis Potosí, Mexico and itszinc-modified form (Zeo-Zn). The municipal wastewater, which was from Saltillo, Coahuila, Mexico, was treated for FC analysisfor four months. The physicochemical properties of zeolite were analyzed, and their behavior as filter media for ...
Autori: Sasirot Khamkure
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26212

AbstractAdsorption of a cationic dye, methylene blue, from aqueous solutions by using sawdust (without any modification) by batchadsorbers was investigated. The surface characterization of the saw dust was carried out by Fourier transform infrared (FTIR) andscanning electron microscopy (SEM) and pHzpc of the surface was also determined. Effects of different parameters such ascontact time and initial concentration, temperature and pH on the process of removal were studied. The process of removal ...
Autori: Sushmita Banerjee
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26216

AbstractInvestigations on thermochemical transformation of asbestos fibers followed by computer aided image analysis are presented.Asbestos Containing Wastes (ACW), notably asbestos-cement, were characterized before and after microwave heating withadditives aimed at reacting with and transforming asbestos fibers. Microprobe analysis helped determine the chemicalcompositions. X ray diffraction (XRD) was used to confirm decomposition of asbestos fibers during microwave heating. Electronparamagneti...
Autori: Yan Yvon
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26256

AbstractThe aim of this study is to elaborate a survey on the efficiency of three anti-aging cosmetic formulations by applying FourierTransform Infrared Spectroscopy (FTIR) with Attenuated Total Reflection (ATR) in order to characterize and identify thespecific recognition markers of the active ingredients. FTIR (ATR) spectrometry in specific regions was applied also to theingredients used in these products, depending on their role in the specific cream. Comparing the different composition of th...
Autori: Anca Maria Juncan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26261

AbstractWaste Electrical and Electronic Equipment (WEEE) is increasing day by day more than the amount of municipal wastes in thedeveloping world. According to researches of Ministry of Environment and Urbanism in Turkey, to meet growing waste demandin all regions, 850 collection points for the district municipalities and 15 large collection centres are needed. From this point ofview, in this study, the site selection of the plants used for planning and recycling of electrical and electronic equ...
Autori: Müfide Banar
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26268

AbstractThe electrochemical properties of two fluorinated substrates, namely 1H-3-methyl-4-ethoxycarbonyl-5-(4-fluorobenzylidenehydrazino)-pyrazole (Ia) and 1H-3-methyl-4-ethoxycarbonyl-5-(2-fluoro-benzylidenehydrazino)-pyrazole (Ib)respectively have been investigated in the room temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium tetrafluoroborateon a platinum electrode. The voltammetric investigation of the above compounds in the mentioned RTIL shows mainly twoirreversible anodic peaks...
Autori: Liviu-Virgil Costea
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26471

AbstractA series of experiments were performed to quantify the adsorption of Cesium on Silica impregnated withtrihexyl(tetradecyl)phosphonium chloride (Cyphos IL-101). Non-radioactive cesium solution was used as a surrogate of theradioactive 137Cs. The obtained impregnated Silica with the studied ionic liquid was characterized through scanning electronmicroscopy, energy dispersive X-ray analysis and Fourier transform infrared spectroscopy in order to put in evidence that theimpregnation with the...
Autori: Adina Negrea
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26473

AbstractIn this study, TiO2-zeolite modified carbon nanotubes-epoxy (TiO2-Z-CNT-Epoxy) and TiO2-zeolite modified carbon nanofibersepoxy(TiO2-Z-CNF-Epoxy) composite electrodes were applied for pentachlorophenol (PCP) degradation and determination inaqueous solution. The morpho-structural characterization of the composite electrodes was studied by scanning electronmicroscopy. The electrochemical behaviour of the electrodes was investigated under UV irradiation presence/absence, usingcyclic voltamm...
Autori: Ágnes Jakab
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26491

AbstractA pot experiment was conducted to evaluate the growth and metal accumulation in water spinach (Ipomoea aquatica) establishedon a 30-year old active firing range soil amended with chicken manure (CM) and coconut tree sawdust (CTS) at application ratesof 0%, 1% and 3% (w/w). Both amendments increased biomass yield and reduced plant metal uptake. The bioconcentrationfactor (BCF) and transportation factor (TF) values of the metals were in the order of Zn > Cu > Pb. The ammonium acetate...
Autori: Azlan Kamari
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26499

AbstractVegetables are an important part of a healthy diet because of their nutritional value. Contamination in vegetable may provehazardous for population. Polycyclic aromatic hydrocarbons (PAHs) are compounds widespread in the environment, many ofthem showing carcinogenic effects. These compounds can reach the food chain by different ways and, therefore, the analysis ofPAHs in food is a matter of concern.The present work provides data regarding levels of PAHs: acenaphthene (Ace), acenaphthylen...
Autori: Alina Soceanu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26510

AbstractDue to the continuously increasing trend in the costs of the traditional fossil fuels, the development of residential or commercialbuildings with reduced energy needs becomes a significant and more pressing scientific challenge. At the same time, consumersare increasingly demanding more comfortable buildings, where the energy needs are addressed using locally available renewableenergy resources. Consumers also require a higher level of security, supervision, and control of the building, ...
Autori: Géza Husi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26553

AbstractThe adsorption potential of 10 wt.% COOH/TUD-1 material for removing Cd2+ from aqueous solutions was investigated via thebatch technique, and the effects of pH, temperature and contact time were studied. Experimental data showed that the maximumCd2+ adsorption, 90%, occurred at pH 6. The adsorption equilibrium was reached within 35 min for 10 wt.% COOH/TUD-1. Theadsorption mechanism was investigated in terms of its thermodynamics and kinetics. The adsorption data were fitted using theLan...
Autori: Nabila Bensacia
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26558

AbstractThis paper presents the experimental results obtained during testing in an electromagnetic field with non-ionizing radiations fromlow-intensity microwaves acting on a group of substances consisting of: double distilled water, neutralized to pH = 7; drinkingwater with pH = 7.3; slightly acidic aqueous solutions obtained by diluting the acetic acid at concentrations of 2.25‰, 4.5‰ and9‰ in double distilled water, for pH = 6.8, 6.7 and 6.5, respectively. The exposure of the samples was perf...
Autori: Gheorghe Morariu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26562

AbstractThe aim of this work is to study the valorisation of two regenerated low density polyethylene (LDPE) coming from dirty wastesby blending with polypropylene (PP) in presence of compatibilizer. The first step was the determination of the physico-chemicalproperties of the two regenerated samples (density, melt flow index, water absorption, melting temperature and oxidation index)and the mechanical properties (tensile and shore D hardness).The second step was the characterization of the phys...
Autori: Nabila Guerfi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26565

Abstract This study examined the characteristics of geopolymer with solar panel waste glass. After 28 days of curing, the compressive strengths of the geopolymer samples containing 10 mass % and 20 mass % solar panel waste glass were 63.3± 1.8 and 49.1 ± 2.2 MPa, respectively. The geopolymer sample with 10% solar panel waste glass exhibited a stronger reaction than that with 20% solar panel waste glass, and the strength decreased as the amount of solar panel waste glass increas...
Autori: HuiCong Hao
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26621

Abstract Temperature-dependent d.c. electric conductivity of some recently synthesized organic compounds, 4,7-phenanthroline derivatives is studied. Thin-film samples (d=0.34-0.63 m) spin-coated from dimethylformamide solutions onto glass substrates have been used. Organic films with reproducible electron transport properties can be obtained if, after deposition, they are submitted to a heat treatment within temperature range of 298523K. Examined organic compounds in thin fil...
Autori: Cristina M. Al Matarneh
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26656

Abstract The present work investigates the performance of Cristal-RightTM CR100 zeolite based on the equilibrium and thermodynamics water softening process. The commercial zeolite was characterized by scanning electron microscopy combined with energy dispersive X-ray spectroscopy and FT-IR spectroscopy. The equilibrium performances of zeolite were evaluated by the sorption capacity of calcium cations from calcium chloride solutions varying the calcium concentrations corresponding to moderate...
Autori: Liliana Lazăr
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26670

Abstract Magnetic contamination is considered more and more as a challenging issue related to biosphere pollution with magnetic materials originating in natural and artificial sources (volcanic eruptions and respectively industrial activities that contributed to iron and other metal compounds spreading in air, water and soil). Aiming to study the impact of magnetic metal ions such as iron and cobalt on the metabolism of some environmental microorganisms, in this paper an experimental simulat...
Autori: Lacramioara Oprica
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26675

Abstract Nanoparticles are very interesting materials due to their properties which can be different than those of the bulk and they have many applications in various domains, like electronic, catalytic or biomedical. Gold is one of the most studied materials and is used in many applications that will have the human being as recipient, that’s why gold nanoparticles should be obtained as environmentally friendly as possible. In this work, particles of around 50 nm were obtained in a so ...
Autori: Razvan State
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26676

Abstract The bismuth oxide (Bi2O3) nanoparticles are easily synthesized from a solution of bismuth nitrate pentahydrate (Bi(NO3)3·5H2O) in ethylene glycol by a hydrolysis solvothermal route at temperatures of 120-150C. X-ray diffraction, scanning electron microscopy and UV-visible diffuse reflectance spectroscopy are used to characterize the products. The results show that the reaction temperature, the reaction duration and the initial solution concentration play important rol...
Autori: Xiaowen Luan
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26689

Abstract This research evaluated two electrokinetic remediation systems (EKR) for separating phenanthrene from bentonite and its electrochemical destruction by using a Boron Doped Diamond (BDD) electrode. The effect of the electrochemical potential for the oxidation of phenanthrene in liquid phase with Ti/BDD was analyzed by Normal Pulse Voltammetry and Hydroxyl Radical (●OH) analysis using the Spin Trapping Technique. The results showed that 70% of phenanthrene was removed from benton...
Autori: Alejandro Medel
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26710

Abstract Locally sourced clay from Kuala-Kangsar town in Perak state Malaysia was used in both its raw (RKKC) and modified (MKKC) form as adsorbents for the removal of methylene blue (MB) from synthetic textile wastewater in batch adsorption process. The raw clay was modified through H2SO4 acid treatment, Al(OH)3 ion exchange, calcinations and then molded into beads before freeze drying. The BET surface areas of RKKC and MKKC were 11 and 100 m2/g, respectively; their elemental analysis and ...
Autori: Manase Auta
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26717

Abstract This paper aims to analyze the characteristic of Road deposited sediment (RDS) using West Chang Tan highway, Hunan, China as a study site. RDS samples were collected at five representative highway sites and the particle size distribution was generally less than 150μm. Particles with the grain size (<150μm) had high metal concentrations among all sampling sites (unit: mg/kg): Cu 74-178, Zn 309-2737, Pb 601-1160, Cd 9.8-44.5. There is significant spatial variability between t...
Autori: Yunbo Zhai
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26728

Abstract MFe2O4 nanopowders (M = Ni, Co, Cu) were prepared using the precursor technique, starting from the corresponding metal nitrates and poly(vinyl alcohol)-PVA. During the heating of metal nitrates- PVA solution, a redox reaction takes place around 150°C, leading to the formation of M(II) and Fe(III) carboxylates. These compounds were used as precursors for the ferrites nanopowders. The desired ferrites were obtained by thermal decomposition of the carboxylates; the obtained...
Autori: Marcela Stoia
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26745

Abstract The increasing diffusion of Hi-tech complex products has raised the attention of scientific community towards their End of Life (EoL) treatment, both in terms of assuring an appropriate disposal, to avoid the dispersion of harmful substances, and at the aim of their exploitation as valuable sources of raw materials. Within this study an integrated approach for waste electrical and electronic equipment (WEEE) end of life treatment is proposed based on the integration of hydrometallur...
Autori: Claudia Brunori
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26777

Abstract The preliminary results of aromatic hydrocarbon (AR) levels and PM2.5 physico-chemical characterization in Rome urban air throughout the 2014 are reported. A gas chromatograph was used for continuous measurements of AR concentrations with 30 minute time intervals. PM2.5 was collected by PM swam Dual Channel. Metal content was determined by ICP-MS. Single particle characterization was performed by Scanning Electron Microscopy equipped with a thin window system for X-ray microanalysis...
Autori: Carla Fanizza
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26780

Abstract This paper investigates the role of collective organizations created by producers to comply with the WEEE Directive. There are limited case studies on these producer responsibility organizations (PROs) despite the crucial role that they play in Extended Producer Responsibility (EPR) schemes. An important aspect in order to evaluate the efficiency of these compliance schemes is the analysis of their internal costs including transaction costs. First of all, this research provides an u...
Autori: Marinella Favot
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26781

Abstract The amount of collected Waste Electrical and Electronic Equipment (WEEE) in Europe is growing about 7 wt.-% per year (2007- 2012). It contains a number of economically relevant base, precious and high-tech metals. However, only a limited number of these metals can be recovered by currently applied recycling processes. Especially high-tech metals like gallium, germanium and tantalum get lost during the treatment of WEEE. The pyrolysis technology allows an accumulation of these metals...
Autori: Peter Hense
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26785

Abstract In the present study, several selected formulations based on recycled (rPP) or virgin polyolefins (vPP) and lignocelluloses were prepared and subjected to microorganism attack. Biodegradation tests were performed with microbial strains belonging to fungal genera, like Aspergillus, Penicillium and Fusarium. The initiation of biodegradation was demonstrated by Scanning Electron Microscope (SEM) micrographs showing the colonization of surface samples by microbial strains. The crystalli...
Autori: Luiza Jecu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26879

Abstract In the European Union, the hazardous waste recycling has become a priority, as response at legal prohibition for landfilling of untreated WEEE. The economic and eco-efficient recycling methods acquire more and more interest from the industry. The Cathode Ray Tubes (CRT) glass derived from Waste of Electric and Electronic Equipment (WEEE) dismantle is known as hazardous waste, because of their heavy metals content, especially lead. For this type of waste, the authors have proposed in...
Autori: Antoanela Popovici
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26890

Abstract The results of batch tests of anaerobic dechlorination on groundwater samples collected downgradient from an industrial site in Northern Italy are presented and discussed. The experiments were carried out using sucrose as electron donor at equimolar concentration and at selected excess with respect to the total reducible species. The purpose of the study was to investigate the effectiveness of sucrose to achieve a complete chlorinated solvents degradations at the specific site, and ...
Autori: Luca Di Palma
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26895

Abstract The CoCrMo alloys have been widely used in artificial knee or hip joints. It is well known that these materials have a good corrosion resistance and acceptable biocompatibility properties. Zirconia as a ceramic biomaterial facilitates the osteoconductivity and tissue osteogenetic capacity in new bone formation around implant. Linear polarization and electrochemical impedance spectroscopy (EIS) were employed to characterize the electrochemical behavior of plasma sprayed yttrium oxid...
Autori: Manuela Romaş
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26896

Abstract The design, the realization of the prototype and the acoustic standardization process of a novel periodic system made up of multiphysical phenomena scatterers as a road traffic noise reducing device are reported in this work. The structure analysed here, inspired by Sonic Crystals, has been designed following the guidelines established in recent works according to the concept of tunability. Thus, the acoustic barrier proposed here includes several mechanisms of noise control, such a...
Autori: Sergio Castińeira-Ibáńez
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26900

Abstract The possibility to use release controlled fertilizers in the agriculture of the tropical countries is more important than in the agriculture of the countries of the cold regions. In this context, the purpose of this work is the characterization of an encapsulated commercial Fertilizer of Controlled Release named FERLENT®, which was covered with a polymeric material, obtained in situ, under controlled conditions, which allowed to corroborate the fairly well adjustment of the synt...
Autori: Mayra González Hurtado
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=26916

Zirconia (ZrO2) as a ceramic biomaterial facilitates the osteoconductivity in new bone formation around implant. Surface characterization before and after electrochemical testing was performed used scanning electron microscopy (SEM). The electrochemical properties of the yttrium oxide stabilized zirconium oxide (YSZ) coated and uncoated MgCa sample with the open circuit potential at different immersion time in Ringer’s solution were studied by electrochemical impedance spectroscopy (EI...
Autori: Bogdan Istrate
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27021

A biodegradable iron based alloy was obtained through classical melting method using a furnace with controlled atmosphere. The metallic material was obtained from high purity materials using a proper obtaining method. The material is proposed as an alternative to magnesium alloys that have a very fast degradation period for applications with longer healing periods (more than 3 and between 12 to 18 months). The material was analyzed using scanning electron microscopy (SEM) and X-ray dispersive...
Autori: Sergiu Stanciu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27023

This paper aims to establish the capacity removal of hexavalent chromium [Cr(VI)] from wastewaters using a TiO2 – Fe3O4 based nanocomposite. Latest researches in the field point adsorption as a better option for removal of heavy metal ions from waters, this method being more efficient and cost effective, in comparison with other advanced methods like reverse osmosis, ion exchange, nanofiltration, etc. Based on this information, the goal of this work had as purpose the obtaining, charact...
Autori: Andra Predescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27025

Heavy metal pollution is a major source of aquatic contamination and has deleterious effect on the environment, therefore treatment of the polluted sites and wastewater becomes very essential. Biofilm based bioremoval of heavy metals have been a new area of research. Bacterial strains belonging to the genus Bacillus, isolated from chromium polluted soil (Palar river basin, India) have been employed as consortium for Cr(III) removal from chrome tanning effluent. The bacterial isolates were fou...
Autori: Aafreen Fathima
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27086

This paper reports the potential of rice husk waste biomass to remove copper (II) from simulated wastewater under different experimental conditions. For this, rice husk has been pre–treated by boiling, formaldehyde and concentrated sulphuric acid. Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy and Energy dispersive analysis X–ray analyses were performed before and after adsorption, to explore number and position of the functional groups available for copper ...
Autori: Manjeet Bansal
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27095

Microbial fuel cells (MFCs) are bioelectrochemical reactors that directly convert the chemical energy stored in chemical bonds of organic substrates, to electrical energy. Saccharomyces cerevisiae was implemented as biocatalyst in the anaerobic anode compartment of an MFC using glucose as carbon source and methylene blue as electron mediator. Our results showed the effect of methylene blue on the microbial metabolism and the reversibility of the redox reaction of the shuttle mediator in the p...
Autori: Ruggero Rossi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27131

The aim of the present study was to prepare environmentally friendly silver-based materials using Cornus mas L. fruits extract. For this purpose, silver nanoparticles (Cornus mas-AgNPs) were green synthesized using this plant extract. The bioreduction of silver ions was analyzed by UV–VIS and ATR-FTIR spectroscopic studies. Scanning Electron Microscopy (SEM) analysis revealed the formation of spherical phyto-nanosilver particles with size ranging between 12 and 40 nm. Different amounts ...
Autori: Ioana-Raluca Suica-Bunghez
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27139

In this study, the impact of silicate admixture in 2-line ferrihydrite on its sorption properties is presented. Synthetic ferrihydrites with broad Si content in the range of 0 to 1.5 Si/Fe molar ratios were prepared and characterized using X-ray diffractometry (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM-EDS). With an increase in the Si/Fe ratio, a typical XRD peak at 2.5Å broadens and shifts toward 3 Å; the position of Si-O stretchi...
Autori: Gabriela Pieczara
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27140

The adsorption of tartrazine from aqueous solution was evaluated using an iron (III) modified zeolitic tuff. The adsorbent was characterized by scanning electron microscopy and X-ray power diffraction; the modification process does not affect the crystalline structure of the zeolitic tuff. Sorption kinetic, isotherms, dose and pH effects were determined and the adsorption behavior was analyzed. The sorption equilibrium was reached in 72 hours, the adsorption capacity determined by the Langmuir m...
Autori: Adrián Alcántara-Cobos
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27182

Date pits were used as a low-cost adsorbent to study the effective removal of copper (II) ions in an aqueous solution on the basis of adsorption kinetics and isotherm equations. Before and after the adsorption process, the date pits were characterized by electron scanning microscope (ESM) as well as Infrared spectroscopy (IR). The effects of the pH, zero point of charge, the adsorbent mass, and the adsorbent particle size on the adsorption of copper (II) were also studied. Equilibrium data were ...
Autori: Tarek E. Khalil
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27212

Adsorption equilibrium, kinetic and dynamic studies were done for removal of zinc (II) from aqueous solutions using alunite ore. The alunite sample was characterized by using X-ray fluorescence (XRF), optical microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) porosimetry, differential thermal (DTA), and Thermogravimetric (TG) analyses. The batch equilibrium adsorption data of zinc (II) ions onto alunite particles were applied to some...
Autori: Hoda Arabyarmohammadi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27216

In this study was synthesized MCM-41 mesoporous silica by hydrothermal treatment and funtionalized with titanium in order to obtain mesoporous materials with high surfacea area and photocatalytic activity in photodegradation of organic compounds as antibiotics. The functionalization of the synthesized support material was achieved by impregnation from alcoholic solution. The obtained materials (MCM-41) and (Ti-MCM-41) were characterized by X-ray diffraction (XRD), scanning electron microscopy (S...
Autori: Cristina Orbeci
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27274

The objective of this study was to develop a naturally dyeing process of 70% wool /30% Angora mohair blended yarns by using bio-mordants as an environmentally friendly alternative for the conventional metallic salts. Bio-mordanting operation was achieved by using of condensed tannin extract from quebracho bark trees. Conventional mordanting has been performed using the conventional mordants like copper sulphate and tin chloride. Another specific objective of this study was to investigate the pos...
Autori: Ioana Stanculescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27337

The main objective of this study was to investigate the potential utilization of polyethylene terephthalate PET waste in cementitious matrix, as substituent to cement, to develop lightweight construction materials and for preventing chemical attacks or repairing various reinforced concrete structures. Composites containing different amounts of PET particles, as partial replacement to cement by weight, were characterized by destructive and non-destructive testing. So, the thermal conductivity, ul...
Autori: Ahmed Soufiane Benosman
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27381

The electronic waste (e-waste) is increasingly flooding Asia, especially in developing countries. E-waste could precipitate a growing volume of toxic input to the local environment if it was not handled properly. This brings the evaluation of environmental impact from electronics an essentially important task for the life cycle assessment (LCA) and the end-of-life management of electronic products. This case study presented a quantitative investigation on the environmental impact analysis on ele...
Autori: Srivalli Chellvarajoo
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27384

The kinetics of azo dye reduction based on combined effect of biochemical reduction by anaerobic mixed culture and chemical reduction with hydrogen sulfide was investigated. Hydrogen sulfide was produced by sulphate reducing bacteria existing in the anaerobic mixed culture. The effect of initial anaerobic biomass, initial substrate, and initial dye (Reactive Orange 107) concentrations on reduction kinetics were studied with batch assays. The municipal waste sludge was used as electron donating s...
Autori: Umay Gokce Ozkan-Yucel
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27386

• EXPERIMENTAL INVESTIGATION OF TEMPERATURE EFFECTS ON THE PARAMETERS OF PHOTOVOLTAIC PANELS    • CONCENTRATIONS OF CHROMIUM, CADMIUM AND NICKEL IN TWO CONSUMED FISH SPECIES OF PERSIAN GULF, IRAN    • IMPROVING THE ENERGY EFFICIENCY OF RESIDENTIAL BUILDINGS BY USING A DRAIN WATER HEAT RECOVERY SYSTEM    • ASSESSMENT OF METAL CONTAMINATION AND ECOLOGICAL RISK IN URBAN SOILS SITUATED NEAR A METALLURGICAL COMPLEX    • FINANCIAL DE...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27398

EXPERIMENTAL INVESTIGATION OF TEMPERATURE EFFECTS ON THE PARAMETERS OF PHOTOVOLTAIC PANELS    • CONCENTRATIONS OF CHROMIUM, CADMIUM AND NICKEL IN TWO CONSUMED FISH SPECIES OF PERSIAN GULF, IRAN    • IMPROVING THE ENERGY EFFICIENCY OF RESIDENTIAL BUILDINGS BY USING A DRAIN WATER HEAT RECOVERY SYSTEM    • ASSESSMENT OF METAL CONTAMINATION AND ECOLOGICAL RISK IN URBAN SOILS SITUATED NEAR A METALLURGICAL COMPLEX    • FINANCIAL DEVELOPME...
Autori:
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27399

Steady Raw Materials (RM) supply is essential for the EU economy and increasingly under pressure to sustain the businesses and industries demand. The supply of RM is not only a matter of availability of primary but also of secondary raw materials (SRM). In fact a great amount of waste can be regained as practical and valuable SRM by enhancing the recovery processes from industrial, mining and municipal landfill sites, especially if we consider that Europe is highly dependent on the imports of...
Autori: Giovanna Antonella Dino
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27403

This research was focused on the valorization of agro industrial waste/by products available in the local industry with the kilometer zero (km 0) concept, as a replacement of virgin raw materials (clay) to elaborate lightweight aggregates (LWAS). The alternative raw materials were employed as pore forming agent, in order to reduce sintering temperature and energy consumption of the furnace. The three technical nutrients studied were provided for local food industries: sludge from wastewater trea...
Autori: Romina D. Farias
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27405

A worldwide trend is leading the international community to explore the possible paths for the transition from a linear to a circular economic model. Recent studies identified the main enabling factors to facilitate this transition, among which closed loop logistics models and new service-based and function-oriented business models play a significant role. The diffusion of new business models relating to the use of a product rather than its ownership can indeed reduce material consumption and th...
Autori: Maria Grazia Gnoni
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27418

In this work, magnetic alginate was synthesized by encapsulating of Nickel Zinc Ferrite nanoparticle within Ca-alginate. The synthesized magnetic alginate was modified by ethylenediamine using microwave radiation to remove anionic dye from wastewater. The characteristics of magnetic nanoparticle, magnetic alginate and magnetic alginate amide (MAA) were studied using Fourier transform infrared (FTIR) and Scanning electron microscope (SEM). FTIR analysis confirmed the amidation of alginate. Di...
Autori: Niyaz Mohammad Mahmoodi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27424

A low-cost magnetic zeolitic material was synthesized from coal fly ash by means of a new, simple method involving alkaline hydrothermal zeolitization of fly ash (FA) followed by low-intensity wet magnetic separation. Scanning electron microscopy with energy-dispersive X-ray analysis was applied to characterize the composition, microstructure, and morphology of the material. The mineral and synthetic zeolite phases were identified by powder X-ray diffraction. The obtained magnetic zeolitic m...
Autori: Annie Shoumkova
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27486

An experimental design methodology was applied to study the copper removal from aqueous solutions by immobilized nanoscale Lentinus edodes. The effect of the various variables (biomass loading, initial metal ions concentration, PH, contact time, agitation speed and temperature) were studied in the batch experiment. The results showed that pH, contact time and agitation speed were the most significant variables on biosorption of copper ions determined by Minimum Run Equireplicated Res V Design...
Autori: Rong Chen
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27487

The use of activated carbon as filter media for water has gained research attractions over the years. A comparison study of granular activated carbon (GAC) of extracted palm fruit fibres (EPF), palm kernel shell (PKS) with existing filter material (EFM) commercially produced activated carbon for water filtration has been conducted. Palm kernel shells and extracted palm fruit fibres from palm oil mill wastes were processed to form activated carbon by chemical activation process. Scanning Elect...
Autori: Jamaliah Idris
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27498

Average emission factors of air toxic compounds, emitted from motorcycles in Bangkok, Thailand were analyzed using the IVE (International Vehicle Emission) model. The model was utilized taking into account the actual fleet and characteristics of motorcycles of the study area. Four air toxic compounds (namely benzene, 1,3 butadiene, acetaldehyde and formaldehyde) and their emission rates were calculated under two main pollution abatement scenarios (the improvement of fuel quality and switching of...
Autori: Pantitcha Outapa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27513

This study focuses on some mechanical properties resulted from the tensile testing of a set of green composites with a Dammar-based matrix and reinforcement material of silk, flax, cotton and hemp fabrics. To be precise, we have ascertained the characteristic curve, the resistance to and the elongation at fraction, as well as the modulus of elasticity for each set of samples from these composites and for a set of bioresin samples. With the help of an Electronic Scanning Microscope we captured im...
Autori: Ion Ciucă
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27516

This paper investigates the macrophyte Azolla pinnata modified with sodium hydroxide, as a bioadsorbent for Cu2+ and Pb2+ ions in synthetic solutions. Biomaterial characterization was performed using Scanning Electronic Microscopy (SEM); Energy- Dispersive X-Ray Spectroscopy (EDX); Fourier Transform Infra-red (FTIR) spectroscopy techniques and through the blocking of carboxylic and sulfonic functional groups. Kinetics of the process has highlighted a quick and efficient adsorption, even in low ...
Autori: Arielle Barros
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27532

The tenacious technological development at latter decades has conditioned the growth of electrical and electronic equipment (EEE) amount and generation of their waste. That is a global heterogeneous problem including different stakeholders and various aspects: environmental, economic, social and technological. The regional electrical and electronic waste (WEEE) management systems (MS) are developed in order to solve this problem. The implementation of WEEE recycling and collection targets is not...
Autori: Inga Gurauskienė
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27537

A simple and efficient method for preparing Ag-doped TiO2 nanoparticles was successfully developed, by associating the sol-gel method and the impregnation-reduction. While titanium dioxide is one of the most used solids as photocatalyst, silver is particularly interesting for applications in biological and chemical detection and for its antibacterial properties. Moreover, in photocatalysis silver acts as an electron sink and donor in capturing the photogenerated electrons. The structural and mor...
Autori: Catalina Nutescu Duduman
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27566

In this study, Ag/TiO2–P25 nanoparticles prepared via photodeposition method and its textural properties were characterized using X–ray diffraction (XRD), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy (DRS), and N2 physisorption techniques. The cements modified with TiO2–P25 and Ag/TiO2–P25 nanoparticles were immobilized on tile plates, and their photocatalytic activity was evaluated versus the removal of Erioglaucine as the model o...
Autori: Mohammad A. Behnajady
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27589

Thin-film transistor liquid-crystal display (TFT-LCD) waste glass can be used as a raw material for producing geopolymers, because it contains large amounts of silicon and aluminum in its amorphous structure. The setting time and compressive strength were evaluated to determine the quality of the geopolymer product with various amounts of nano-SiO2 (0%–3%) and TFT-LCD waste glass replacement (0% - 40%). The microstructures of the samples were characterized using mercury intrusion porosimet...
Autori: Kang Gao
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27634

Magnesium wastes are among the gradually ascending and therefore challenging metal wastes, which are produced by many industrial activities. The purpose of this study is the usage of magnesium waste, a raw material in magnesium borate production by hydrothermal synthesis. Boron sources (boric acid (H3BO3) and boron oxide (B2O3)) react with magnesium wastes in order to synthesize the magnesium borate mineral of admontite (MgO(B2O3)3ꞏ7(H2O)). In addition to the synthesis from waste magne...
Autori: Azmi Seyhun Kipcak
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27657

The Silicon wafer plays an important role in modern electronic products. During the production of Silicon wafer, a large amount of scrap Silicon wafer is generated. The necessity for it to be recycled and recovered is of vast importance since the metal Silicon (Si) is the major by product. Besides Silicon, the wafers also contain a small quantity of Copper (Cu) and Aluminum (Al), that are considered as minor elements during the recovery process of the Silicon wafer production. Therefore, in o...
Autori: Ching-Hwa Lee
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27660

The aim of this paper is to show the results of two methodological approaches applied for decontamination of the Midia Port dredged sediment to assess their potential reusability. Firstly, the sediment samples were defined in physical, chemical, microbiological and ecotoxicological terms. The results were compared to the limit values established by environmental regulations for dredged sediment management. Some sediment samples exposed a very high concentration of hydrocarbons; the sediments wer...
Autori: Irina Catianis
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27770

This study aims to monitor Volatile Organic Compounds (VOCs) and odour annoyance perceived by the exposed population living nearby a petroleum plant through an integrated high temporal resolution methodological approach. The area under investigation is considered one of the most critical industrial areas of the South of Italy (Basilicata) because of presence of the largest Italian petroleum plant, called the "Center Olio Val d'Agri" (COVA). In fact, VOCs and odours emitted from ext...
Autori: Alessia Di Gilio
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27791

Heavy metals are inorganic persistent pollutants with adverse health and environmental effects. In our study, self-synthesized iron oxide magnetic nanoparticles were encapsulated in the Phanerochaete chrysosporium (P. chrysosporium) hyphae. The prepared biosorbents possessed high efficiency for Pb(II) biosorption from single and binary metal systems. The maximum biosorption capacity was found to be 50.05 mg g–1 at pH 5.0. Environmental scanning electron microscope accompanied with energy d...
Autori: Danlian Huang
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27864

Indigenous Pseudomonas veronii 2E, Klebsiella oxytoca P2 and Klebsiella ornithinolityca 1P were tested as catalysts for the transformation of Cr(VI) to Cr(III) for Cr(VI)-containing wastewater biotreatments. The Cr(VI) biotransformation was assayed during bacterial growth and by using pre-grown quiescent cells. Proof of the unsuitability of a biotreatment based on Cr(VI)-reduction during bacterial growth was found: the reduction rate and the maximum Cr(VI) concentration able to be reduced were t...
Autori: Mauricio Javier Alessandrello
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27853

This paper seeks to evaluate the quantities of e-waste in Botswana from 2000-2019, with a view towards formulating an effective and sound e-waste management system. Due to a lack of complete historical records on e-waste quantity and quality, this was achieved by the Grey Model GM(1,1) forecasting method. Our estimations indicate that an average weight of about 293.18 tons of e-waste will be generated in 2019 in the country. Considering an economic lifespan of between 3 and 10 years, more e-wast...
Autori: Daniel Mmereki
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27838

The aim of this study is to investigate a variety behaviors of two kinds of media (multiple-layer structures and multiple-layer structures combined with surface treatment, such as finer fibers) with ages using a scanning electron microscope (SEM) and to determine the effect of fabric microstructures on cake formation and pulse cleaning. The results show that fine particles are readily deposited on the surface and inside depth filter medium. The fine fibers with diameters (~0.08 microns, this val...
Autori: Yan Cuiping
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27842

The main topic of this study is the photo-optical and electrochemical behavior of a series of fluorinated copolyimides containing both oxadiazole and perylene moieties in the main chain. The polymers prove a strong photo-optical stability on a large temperature domain and display different types of photoluminescent behavior in solution and in solid state, with emission maxima in the bluish and green–yellow domains. Cyclic voltammetry investigations suggest that the polymers can be easil...
Autori: Radu-Dan Rusu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27883

In order to reduce Cr(VI) and Cr(III) simultaneously, a double microbial fuel cell (MFC) system was employed to treat Crcontaining wastewater. Cr(VI)-MFC used Cr(VI) as a catholyte to supply the generated power to Cr(III)-MFC, while the latter MFC functioned as an external load resistor of the former one. Buffer characteristics of the catholyte greatly affected the reduction of chromium ions. At an initial pH of 2.0, Cr(VI) removal increased from 49.9% to 99.9% when KH2PO4 was added. Keeping ...
Autori: Fang Li
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27896

The native and surface modified adsorbents from agricultural waste, such as Psyllium stalks (PS) were investigated for their ability to remove the Coomassie Brilliant Blue (CBB) dye from aqueous media. The native and surface modified adsorbents were characterized by the Fourier Transform Infrared spectroscopy (FTIR). The results show that the Sodium Bicarbonate Treated Carbon (SBTC) has good surface properties for the removal of the CBB dye from aqueous media. The SBTC was analyzed by Scanni...
Autori: Premkumar Manickam Periyaraman
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27898

The intrinsic safety type of protection significantly increased in complexity during the last decades. Thus, it even provides the opportunity to use highly complex electronic circuits without involving a significant explosion risk within the oil industry or in power plants, but not limited to those two. In order to achieve this performance, the type of protection is based on three pillars: limiting of energy, heat and also fault tolerance. The potential failure of components, connections, and...
Autori: Marius Darie
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27950

In the present work, acid treated natural oil palm trunk powder (OPTP) has been utilized as novel adsorbents for the removal of methyl orange (MO) from aqueous solution. The batch method was employed to study the adsorption behavior of MO which was subsequently determined by UV/Visible spectrophotometer. The adsorption characteristics and operational parameters were determined by monitoring different parameters such as pH, contact time, dye concentration and temperature. The acid treated OPTP an...
Autori: Akil Ahmad
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27975

Synthesis of silver nanoparticles (AgNPs) by plants is a simple, non-toxic and eco-friendly method. The purpose of this study was to develop a method for obtaining silver nanoparticles with biological properties. For reducing the silver ions, an extract of Tilia cordata (linden) flowers was used. Some parameters were investigated to optimize the synthesis method. Thus, the conditions of reaction were varied, such as pH, concentration of silver salt, different ratio of plant extract and silver sa...
Autori: Andreia Corciova
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27977

In this paper, we determined some mechanical properties of a new category of green composites, based on tensile tests. More precisely, we selected a set of samples from a new bio-resin based on Dammar and two sets of samples from green-composites with matrix by bio-resin and reinforced with almost compact layers of Typha latifolia or Schoenoplectus lacustris. For these built materials, we obtained the characteristic curve, tensile strength, percentage elongation after fracture and elasticity mod...
Autori: Ion Ciucă
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27980

In the context of large interest of World Health Organization to progress in prevention of tuberculosis (TB) by avoidance of transferring pathogens from the Mycobacterium tuberculosis (Mtb) complex, and ensuring diagnosis and treatment of this disease at global, regional and country levels, it was found that most people who develop TB disease can be cured if well-timed diagnosis and correct treatment are performed. This paper presents and discusses a case study, when a patient was rapidly diagn...
Autori: Stefania Alice Cislariu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=27982

The paper reports on the preparation of polysiloxane hydrophobized viscose-maghemite/goethite magnetic composite with properties appropriate for uses in oil spill sorption from polluted aqueous media. A multi-step procedure was employed to obtain the polymeric composite. The structures of the prepared samples and precursors were analyzed by Fourier transform infrared spectroscopy (FTIR), whereas their morphology was investigated by means of scanning electron microscopy (SEM). The hydrophobic...
Autori: Răzvan Rotaru
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28008

The environmental and economic impacts posed by waste electrical and electronic equipment (WEEE) make an effective collection and recycling scheme necessary for developing countries. Currently, developing countries in the Asia-Pacific regions are highly variable in terms of their present state of WEEE management, due to different economic conditions and levels of management. In this paper, we surveyed existing WEEE collection and recycling system in three Asia-Pacific developing countries &nd...
Autori: Yuan Chen
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28034

Leather processing is one of the highly polluting industries, due to generation of significant quantities of tanned and untanned wastes. Untanned wastes are less contaminated with chemicals and a better source of high value products such as collagen rather than tanned or finished leather wastes. In the present study, collagen dissolution substances (CDS) were prepared from bovine limed split wastes as value added products, by treating leather wastes with sodium hydroxide and fermented dairy b...
Autori: Gökhan Zengin
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28095

The combustion behavior of several polymers was studied with a cone calorimeter, while the samples were based on a recycled acrylonitrile-butadiene styrene (ABS) and as additives were considered: organic montmorillonite (OMT) and a mixture of two fire retardants (FR). The samples structure and thermal properties are characterized by means of Scanning electron microscopy (SEM), X-ray Powder Diffraction(XRD) and Energy-dispersive X-ray spectroscopy (EDX) and cone calorimeter. The main objective o...
Autori: Tudor Mihai Simionescu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28098

There are considerable environmental and health and safety concerns regarding liquid crystal display (LCD) waste glass because of the waste electrical and electronic equipment (e-waste) that is deposited in landfills. In current study, the effect of variation in LCD waste glass on the deconvoluted fractions of silicon centers of metakaolin geopolymers has been comprehensively investigated to discover the underlying mechanisms governing the performance. Solid/liquid ratio affects the kinetics of ...
Autori: Kang-Wei Lo
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28146

Molybdate anions are used in a lot of fields and represent an essential trace element for plant and animal life; however, excessive amounts can cause adverse effect on various organism and environment. Therefore, in the present paper the adsorption performance of MgnFe- layered double hydroxides in the removal process of molybdate from aqueous solutions was studied. The layered double hydroxide (LDH) was synthesized by co-precipitation at low oversaturation method. Different ratio between Mg and...
Autori: Alin Golban
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28152

The contamination of aquatic and terrestrial environments by pesticides is highlighted by their possible toxic properties and poor biodegradability on the environment. The development of low cost by products from agricultural sectors as a suitable solution for contaminated areas remediation is of great environmental interest. Straw wastes can be considered as a promising alternative to remove different chemical compound that are environmentally toxic. In this study, some materials derived from ...
Autori: Irina Gabriela Cara
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28161

Sodium silicate, iron sulfate, magnesium sulfate, and zinc sulfate were used as the raw materials to prepare a new inorganic polymer flocculant, polysilicate ferric magnesium zinc (PSFMZ), using direct recombination. The effects of molar ratio of zinc to silicon, ratio of iron to magnesium, reaction temperature, and reaction time on deoiling rate were explored. The optimal synthesis conditions for the flocculant for the thermal-washing treatment of oily sludge were determined. Results showed tha...
Autori: Lanlan Yu
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28165

The valorization of a metallurgical waste (i.e., an iron-rich slag) as raw material for the fabrication of high hardness glass-ceramics using differential thermal analysis, X-ray diffraction, X-ray fluorescence and scanning electron microscopy was investigated. The melting of the slag was aided by the addition of waste glass cullet (WGC) and the vitrification field of this system was investigated. The non-isothermal crystallization kinetics of the parent glass with the highest slag content was s...
Autori: Erika Iveth Cedillo-GonzĂĄlez
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28168

The study considers meningococcemia which is one of the most severe form of meningococcal disease and represents a significant worldwide health problem. The occurrence of meningococcemia was investigated based on a case study developed in a Romanian hospital using data taken from the medical records of patients with the diagnosis of meningococcemia. The pathogen can produce a fulminant form of the disease that can lead to death within a few hours of onset. The signs and symptoms of meningococcem...
Autori: Carmen Manciuc
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28179

Inorganic ceramic materials is receiving more attention in recent times due to their unique characteristics which include different pore structures, hydrophilic surfaces, high chemical, thermal and mechanical stabilities that offer avenues for application in water treatment. In the present work, cost-effective clay ceramic water filters of different designs were developed from clay (50, 60, and 70) %, sawdust (15, 20, 25, and 35) %, grog (5, 10 and 15)% ratios plus 5% bone char by volume and ...
Autori: Enyew Amare Zereffa
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28196

Copper and Zinc co-doped titania nano photocatalyst (Cu-Zn-TiO2 NPC) was fabricated and characterized using room temperature X-ray diffraction (XRD), field emission electron microscopy (FESEM) with high-resolution transmission electron microscopy (HRTEM) and energy dispersion X-ray (EDX). X-ray diffraction studies of the Cu2+-Zn2+/TiO2 show the presence of anatase phase TiO2 and in the sample prepared from 0.05, 0.10, 0.15 and 0.20 mmol have also shown the presence of anatase phase only. The ph...
Autori: Tentu Nageswara Rao
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28198

LED waste quartz sand (LEDWS), which is a prominent by product of the LED manufacturing process, may contaminate the environment because it comprises specific heavy metals (e.g., As and Cu), which are hazardous ingredients to the environment when disposed of improperly. Therefore, this study investigated the use of light-emitting diode (LED) waste quartz sand to partially replace Portland Type I cement (OPC) to evaluate the feasibility of reusing it as a pozzolanic material. The SiO2, Na2O, and ...
Autori: Kae-Long Lin
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28207

Printed circuit boards are the most important component of any electrical and electronic device. The average metal content in waste printed circuit boards is ~30-35% whereas the rest of the material is a non-metal fraction (NMF). Metals in the waste printed circuit boards are recycled for their value whereas the NMF is mostly sent to landfills or incinerators for disposal. The circuit board laminates contain flame retardant chemicals that pose potential hazards to the environment and to public h...
Autori: Amit Dhir
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28216

Brominated flame retardants (BFRs) are used in different types of products such as plastic, textiles and electronic circuits with the aim to increase fire resistance and to avoid or to delay the propagation of accidental combustion. However, high concentrations of bromine in waste from electrical and electronic equipment (WEEE) hinder the possibility of their use as secondary raw materials. Furthermore, the possibility that BFRs can be released during mechanical recycling processes, imposes the...
Autori: Giuseppe Bonifazi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28296

MABR (Membrane Aerated Biofilm Reactor) consists in an attached-growth process in which a gas permeable membrane is used as a biofilm carrier, and bubble-less oxygen transfer allows for a counter-diffusional mechanism where the electron donor (NH4+, biodegradable organics) and electron acceptor (O2) reach the biofilm from opposing sides. The paper reports results form the largest MABR installation in the world, demonstrating the beneficial impact of the technology in terms of improved process r...
Autori: Giuseppe Guglielmi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28299

The present study describes the facile synthesis of silver nanoparticles (AgNPs) by green method using aqueous extract of Gazania rigens. The size, morphological, compositional and optical properties of silver nanoparticles were examined through X-ray diffraction (XRD), Energy Dispersive X-ray spectroscopy (EDX), Scanning Electron Microscope (SEM), and UV-Vis spectroscopy respectively. Ultraviolet-Visible spectra showed the absorbance band between 425–460 nm which indicated the synthesis o...
Autori: Tayyaba Shahzadi
ISSN: 1843 - 3707
http://www.ecozone.ro/reviste.php?RID=28349