Paper Title:

Preparation of Nanocrystalline W-Doped TiO2 Powders and their Photocatalytic Properties under Visible Light Irradiation

Periodical Materials Science Forum (Volume 695)
Main Theme Eco-Materials Processing and Design XII
Edited by Hyungsun Kim, Jian Feng Yang, Chuleol Hee Han, Somchai Thongtem and Soo Wohn Lee
Pages 489-492
DOI 10.4028/www.scientific.net/MSF.695.489
Citation Yun Ting Song et al., 2011, Materials Science Forum, 695, 489
Online since July 2011
Authors Yun Ting Song, Wei Na Shao, Wen Bin Cao
Keywords Hydrothermal Method, Photocatalytic, TiO2, W-Doped
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Nanocrystalline W-doped TiO2 powders with different initial W/Ti ratio in starting materials have been prepared by hydrothermal method. The phase composition, morphologies, specific surface areas and the photocatalytic activities under visible light irradiation of the synthesized powders have been characterized. XRD identification reveals that the synthesized powders were composed of anatase. No rutile has been detected in the products. The specific surface area of the powders was ranged from 185 to 210 m2/g by BET measurement. The averaged grain size of the powders was calculated as about 12 nm by Scheller's method. Uniform size distribution and good crystallinity have been confirmed by TEM. UV-Vis spectra show that the absorption edges of the synthesized W-doped TiO2 powders with different nominal doping concentration of W ions have been red-shifted into visible light region, which suggests that the W ions have been doped into the lattice of TiO2. In our case, W-doped TiO2 with initial W/Ti atomic ratio of 1% in starting materials has the best photocatalytic activities when decompose the Methylblue in its aqueous solution, which is consistent with that of the theoretical results from our previous work.