Visible-light-driven nitrogen-doped TiO2 photocatalysts:: effect of nitrogen precursors on their photocatalysis for decomposition of gas-phase organic pollutants

被引：174

作者：

Li, D ^{[1
]}

Haneda, H ^{[1
]}

Hishita, S ^{[1
]}

Ohashi, N ^{[1
]}

机构：

[1] NIMS, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2005年 / 117卷 / 01期

关键词：

nitrogen doping; fluorine doping; titanium dioxide; spray pyrolysis; photocatalysis; acetaldehyde; trichloroethylene;

D O I：

10.1016/j.mseb.2004.10.018

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Yellow-colored N-doped TiO2 (NTO) powders were synthesized by spray pyrolysis from a mixed aqueous solution containing TiCl4 and an N-precursor (urea, guanidine, or ammonium fluoride). All resulting powders possessed spherical particles with an average particle diameter of 0.45 mum, however, the surface morphologies of particles significantly depended on the N-precursors. A porous surface was observed for the particles prepared by using NH4F as N-precursor. Acetaldehyde and trichloroethylene decompositions were used as probe reactions to evaluate the photocatalytic activity of these NTO powders under visible-light (vis) irradiation. The NTO powder prepared from a mixed solution of TiCl4 and NH4F demonstrated the highest photocatalytic activity among three N-precursors, and it was much higher than that of commercial P 25. This high photocatalytic activity was ascribed to a synergetic effect of several factors: its porous and acidic surface, doped N atoms, and simultaneously codoped F atoms during nitrogen introduction. However, no correlation between N-concentration and photocatalytic activity was observed. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：67 / 75

页数：9

共 44 条

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