Fluorine-doped TiO2 powders prepared by spray pyrolysis and their improved photocatalytic activity for decomposition of gas-phase acetaldehyde

被引:296
作者
Li, D
Haneda, H
Hishita, S
Ohashi, N
Labhsetwar, NK
机构
[1] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan
[2] Natl Environm Engn Res Inst, Environm Mat Unit, Nagpur 440020, Maharashtra, India
关键词
fluorine doping; titanium dioxide; spray pyrolysis; photocatalysis; acetaldehyde;
D O I
10.1016/j.jfluchem.2004.10.044
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
F-doped TiO2 (FTO) powders were synthesized by spray pyrolysis (SP) from an aqueous solution of H2TiF6. The resulting FTO powders possessed spherical particles with a rough surface morphology and a strong surface acidity. The fluorine concentrations it) the FTO powders calculated from XPS spectra significantly depended on SP temperature and ranged from 2.76 to 9.40 at.%. The FTO powder prepared at SP temperature of 1173 K demonstrated the highest photocatalytic activity for the decomposition of gas-phase acetaldehyde under both ultraviolet (UV) and visible light (vis) irradiations, and it was higher than that of commercial P 25. This high photocatalytic activity was ascribed to several beneficial effects produced by F-doping: enhancement of surface acidity, creation of oxygen vacancies, and increase of active sites. It was interesting to point out that the vis photocatalytic activity of FTO powders was achieved by the creation of surface oxygen vacancies rather than the improvement of optical absorption property of bulk TiO2 in vis region. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:69 / 77
页数:9
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