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REMOVAL OF AN ORGANIC REFRACTORY COMPOUND BY PHOTOCATALYSIS IN BATCH REACTOR – KINETIC STUDIES
Autori: Lidia Favier
Data aparitiei: Iunie / 2015
Revista: Environmental Engineering and Management JournalVol. 14Nr. 6
ISSN: 1843 - 3707
Pret: 25.00 RON    
N.A.

Abstract
The present work systematically investigates the photocatalytic degradation of carbamazepine (CBZ), an organic compound,
known as refractory to the conventional wastewater treatment by the titanium dioxide PC 500 catalyst. The effects of some
fundamental operating parameters in heterogeneous photocatalysis were investigated in this work in order to determine the main
ones affecting the degradation kinetics. The obtained results clearly showed that the removal rate of the target compound is
strongly influenced by the initial concentration of the pollutant. The degradation reaction rate increases when the concentration of
CBZ decreases due to a lower OH·/CBZ ratio. On the other hand, it was shown that during the first 30 minutes the reaction of
photocatalytic degradation follows a first order kinetic and also that when the incident light flux increases, the photocatalytic
degradation process is accelerated due to the increases of the catalyst excitation probability with sufficient photon energy. A
relatively high CBZ removal yield (of about 87%) was obtained for an initial pollutant concentration of 2 mg/L and an irradiation
time of 150 min. A total organic carbon (TOC) reduction of about 74% was observed confirming the mineralization of the parent
compound under UV light conditions. As expected, it was observed that the effect of TiO2 concentration on the degradation
kinetics was significant confirming the positive influence of the increased number of TiO2 active sites on the process. Finally, the
Langmuir-Hinshelwood (L-H) model was successfully used to fit the experimental results and the L-H model constants were also
calculated.



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