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Journal of Nanomaterials
Volume 2012 (2012), Article ID 524123, 8 pages
http://dx.doi.org/10.1155/2012/524123
Research Article

Comparative Study of the Photocatalytic Activity of Semiconductor Nanostructures and Their Hybrid Metal Nanocomposites on the Photodegradation of Malathion

1Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt
2National Institute of Laser Enhanced Science, Cairo University, Giza, Egypt
3NanoTech Egypt for Photoelectronic, Dreamland, October City, Egypt

Received 3 March 2011; Accepted 31 March 2011

Academic Editor: Linbao Luo

Copyright © 2012 Dina Mamdouh Fouad and Mona Bakr Mohamed. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work is devoted to synthesize different semiconductor nanoparticles and their metal-hybrid nanocomposites such as TiO2, Au/TiO2, ZnO, and Au/ZnO. The morphology and crystal structure of the prepared nanomaterials are characterized by the TEM and XRD, respectively. These materials are used as catalysts for the photodegradation of Malathion which is one of the most commonly used pesticides in the developing countries. The degradation of 10 ppm Malathion under ultraviolet (UV) and visible light in the presence of the different synthesized nanocomposites was analyzed with high-performance liquid chromatography (HPLC) and UV-Visible Spectra. A comprehensive study is carried out for the catalytic efficiency of the prepared nanoparticles. Different factors influencing the catalytic photodegradation are investigated, as different light source, surface coverage, and nature of the organic contaminants. The results indicate that hybrid nanocomposite of the semiconductor-metal hybrid serves as a better catalytic system compared with semiconductor nanoparticles themselves.