![]() |
![]() |
Reviste: » Environmental Engineering and Management Journal» European Journal of Science and Theology» Sănătate Sport și Nutriție
|
HYDROTHERMAL SYNTHESIZED TiO2 BASED NANOPOWDERS FOR PHOTOCATALYTIC APPLICATIONS Autori: Adrian Mihail Motoc, Anca Duta, Oana Raita, Radu Adrian Carcel, Radu Robert PiticescuData aparitiei: September/2011 Revista: Environmental Engineering and Management Journal › Vol. 10 › Nr. 9 ISSN: 1843 - 3707 ![]() Abstract:
Hydrothermal synthesis was used to obtain nanostructured TiO2 based nanopowders. There were prepared pure and ZrO2 doped compositions consisting mainly of anatase phase with crystallite size up to 20 nm. The agglomerates of the as-synthesized materials had dimensions ranging from a few hundreds nanometers to 200 microns. The investigations concerning the thermal behavior revealed the presence of an exothermal effect at around 550oC which could indicate a possible phase transformation of anatase to rutile but further studies are required. The photocatalytic properties of the TiO2 hydrothermal nanostructured powders were evaluated in a photoreactor under UV (λmax = 365 nm) irradiation using methylene blue dye and the effect of H2O2 on the photocatalytic efficiency was tested. The results may be attributed to the presence of free radicals and holes generated in the anatase nanostructure evidenced by EPR spectra of nanopowders. |