Characterization and activity of visible-light driven TiO2 photocatalyst doped with tungsten

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Title:	Characterization and activity of visible-light driven TiO2 photocatalyst doped with tungsten
Authors:	T. Putta Ming-Chun Lu Jin Anotai
Contributors:	環境資源管理系
Keywords:	2-chlorophenol photocatalysis titanium dioxide visible light
Date:	2010-09
Issue Date:	2012-05-31 14:49:33 (UTC+8)
Abstract:	This research aimed to expand the activity of TiO2 down to the visible light region by modifying the sol-gel conditions and doping with tungsten. The optimum conditions for calcination temperature, acid type, and heating rate were 200�C, HNO3, and 1�C/min, respectively. The undoped TiO2 synthesized under these conditions could significantly absorb the visible light whereas the commercial Degussa P-25 could not. The absorptivity decreased sequentially as the wavelength increased from 400 to 700 nm. Within 6 h of 2-W blue-light illumination, 23% of 0.1 mM 2-chlorophenol was removed. The XRD result showed that the crystalline was anatase phase. The visible-light absorption property of the TiO2 became even better when doped with tungsten. At the optimum W to TiO2 ratio of 0.5%, the degradation of 0.1 mM 2-chlorophenol increased to 53% indicating a higher photocatalytic activity. Both crystalline and amorphous TiO2 could exhibit the photocatalytic activity under the visible light region.
Relation:	Water Science and Technology 62(9)：p.2128-2133
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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