Influence of silver doping on the photocatalytic activity of titania films

被引：200

作者：

He, C

Yu, Y

Hu, XF

Larbot, A

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, Res & Dev Ctr Special Inorgan Mat, Shanghai 200050, Peoples R China

[2] Univ Montpellier 2, ENSCM, Inst Europeen Membranes, CNRS,UMR 5635, F-34293 Montpellier 5, France

来源：

APPLIED SURFACE SCIENCE | 2002年 / 200卷 / 1-4期

关键词：

TiO2; sol-gel process; doping; structure; photocatalytic activity;

D O I：

10.1016/S0169-4332(02)00927-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

By means of X-ray diffraction, BET nitrogen adsorption, UV-Vis-NIR transmission spectroscopy, transmission electron microscope, scanning electron microscope, X-ray photoelectron spectroscopy and photodegradation of methylene blue, effects of Ag doping on the microstructure and photocatalytic activity of TiO2 films prepared by sol-gel method were studied. It is found that with a suitable amount (2-4 mol%), the Ag dopant increases the photocatalytic activity of TiO2 films. The mechanism can be attributed to that (1) anatase grain sizes decrease with Ag doping and the specific surface areas of doped TiO2 films increase, the charge transfer in TiO2 films is promoted; (2) by enhancing the electron-hole pairs separation and inhibiting their recombination, the Ag dopant enhances the charge pair separation efficiency for doped TiO2 films. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：239 / 247

页数：9

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