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International Journal of Photoenergy
Volume 2012, Article ID 103672, 8 pages
http://dx.doi.org/10.1155/2012/103672
Research Article

Enhancement of Photocatalytic Activity of ZnO/SiO2 by Nanosized Pt for Photocatalytic Degradation of Phenol in Wastewater

1Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box. 80203, Jeddah 21589, Saudi Arabia
2Nanostructured Materials and Nanotechnology Division, Advanced Materials Department, Central Metallurgical Research & Development Institute (CMRDI), P.O. Box 87 Helwan, Cairo 11421, Egypt
3Department of Environmental Sciences, Faculty of Meteorology, Environment, and Arid Land Agriculture, King Abdulaziz University, Jeddah 21589, Saudi Arabia
4Minerals Technology Department, Central Metallurgical Research & Development Institute (CMRDI), Cairo 11421, Egypt

Received 20 March 2012; Revised 24 May 2012; Accepted 2 June 2012

Academic Editor: Manickavachagam Muruganandham

Copyright © 2012 R. M. Mohamed and M. A. Barakat. 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

ZnO- S i O 2 nanoparticles were synthesized by a sol-gel technique from Z n ( N O 3 ) 2 6 H 2 O and tetraethyl orthosilicate (TEOS). The synthesized samples were further modified by nanosized Pt from H2PtCl6 solution through photoassisted deposition (PAD) and impregnation (Img) routes. The obtained samples were characterized by a series of techniques including X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy, N2 adsorption, extended X-ray absorption fine structure (EXAFS), and transmission electron microscopy (TEM). The photocatalytic activity of the Pt-ZnO/ S i O 2 was evaluated by photocatalytic degradation of phenol in synthetic wastewater under UV-irradiation. Results obtained revealed that the surface area and the photocatalytic activity of the prepared samples were increased in the order ZnO/ S i O 2  < PAD: Pt-ZnO/ S i O 2  < img: Pt-ZnO/ S i O 2 . The surface area decreased from 480 to 460 and 450 m2/g, while the efficiency of the phenol degradation increased from 80 to 85 and 100%, with the ZnO/ S i O 2 , Img: Pt-ZnO- S i O 2 , and PAD: Pt-ZnO- S i O 2 samples, respectively.