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无机材料学报

无机材料学报

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Ag掺杂对TiO2粉末结构的影响

何超1; 于云1; 周彩华1; 胡行方1; André LARBOT2   

  1. 1. 中国科学院上海硅酸盐研究所特种无机材料研究发展中心, 上海 200050; 2. Institut Europeen de Membranes; Campus CNRS; Route de Mende; F-34293 Montpellier Cedex 5; France
  • 收稿日期:2002-03-08 修回日期:2002-04-16 出版日期:2003-03-20 网络出版日期:2003-03-20

Influence of Ag Additive on the Microstructure of TiO2 Powders

HE Chao1; YU Yun1; ZHOU Cai-Hua1; HU Xing-Fang1; LARBOT Andre2   

  1. 1. Research and Development Center of Special Inorganic Materials of Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China; 2. Institute Europeende Membranes; Campus CNRS; Route de Mende; F-34293 Montpellier Cedex 5; Prance
  • Received:2002-03-08 Revised:2002-04-16 Published:2003-03-20 Online:2003-03-20

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摘要： 采用溶胶-凝胶工艺制备了Ag掺杂的TiO2粉末.通过XRD、SEM、EDX、DSC-TG、BET氮吸附法等研究了Ag掺杂对TiO2结构的影响,结果发现掺杂的Ag降低了TiO2锐钛矿向金红石相转变的温度,促进了相转变.适量掺杂时,Ag抑制了锐钛矿粒子的生长,结果使锐钛矿粒子的粒径降低,TiO2粉末的比表面积增加.

关键词: TiO2, Ag, 溶胶-凝胶法, 掺杂, 结构

Abstract: Ag-doped TiO2 powders were prepared by a sol-gel process. The influence of Ag doping on the
microstructure and phase transformation behaviors of TiO2 powders was investigated by means of XRD, SEM, DSC-TG, SEM-EDX and N2 absorption.
The results show that Ag dopant promotes TiO2 anatase to rutile transformation but depresses the growth of anatase grains, decreasing
anatase grain sizes and increasing the specific surface area of TiO2 powder. The Ag doping therefore exhibits a great potential in improving the
TiO2 photocatalytic activity.

Key words: TiO2, Ag, sol-gel, doping, microstructure

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