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Journal of Nanomaterials
Volume 2014 (2014), Article ID 943796, 10 pages
http://dx.doi.org/10.1155/2014/943796
Research Article

Enhanced Photocatalytic Activity of W-Doped and W-La-Codoped TiO2 Nanomaterials under Simulated Sunlight

1School of Light Industry and Chemical Engineering, Dalian Polytechnic University, No. 1 Qinggongyuan, Dalian 116034, China
2Instrumental Analysis Center, Dalian Polytechnic University, No. 1 Qinggongyuan, Dalian 116034, China

Received 10 July 2014; Revised 29 August 2014; Accepted 30 August 2014; Published 21 October 2014

Academic Editor: Yuekun Lai

Copyright © 2014 Chenghe Hua et al. 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

W-doped TiO2 and W-La-codoped TiO2 nanomaterials were successfully synthesized via the sol-gel method. The products were characterized by X-ray diffraction, UV-vis diffuse reflectance spectrophotometer, transmission electron microscopy, and X-ray photoelectron spectroscopy. The presence of W and La results in significant red shift of absorption edge for TiO2-based nanomaterials. The weight ratios of La and W in the composites play important roles in the absorption edge for TiO2-based nanomaterials. The photocatalytic activities of both W-doped TiO2 and W-La-codoped TiO2 photocatalysts for decolorization of methyl orange solution were evaluated under simulated sunlight irradiation. The results showed that both W-doped and W-La-codoped can effectively improve the photocatalytic behaviors of TiO2 nanomaterials ascribed to the improved photoinduced charge carriers separation, enhanced light absorption, and large surface area. Furthermore, W-La-codoped TiO2 exhibited higher photocatalytic activity than W-doped TiO2. Considering their high photocatalytic activity, the doped TiO2 nanomaterials could be applied in wastewater treatment and environmental purification.