热处理温度对TiO2/SiO2复合气凝胶光催化性能的影响

doi:10.3724/SP.J.1077.2012.11781

无机材料学报 ›› 2012, Vol. 27 ›› Issue (10): 1079-1083.DOI: 10.3724/SP.J.1077.2012.11781 CSTR: 32189.14.SP.J.1077.2012.11781

热处理温度对TiO₂/SiO₂复合气凝胶光催化性能的影响

刘朝辉, 侯根良, 苏勋家, 郭锋, 肖舟, 贾海鹏

(第二炮兵工程大学, 西安 710025)

收稿日期:2011-12-15 修回日期:2012-02-09 出版日期:2012-10-20 网络出版日期:2012-09-17

Effects of Heat Treatment Temperature on Photocatalytic Activity of TiO₂/SiO₂Composite Aerogels

LIU Zhao-Hui, HOU Gen-Liang, SU Xun-Jia, GUO Feng, XIAO Zhou, JIA Hai-Peng

(The Second Artillery University, Xi’an 710025, China)

Received:2011-12-15 Revised:2012-02-09 Published:2012-10-20 Online:2012-09-17

摘要/Abstract

摘要： 采用溶胶–凝胶法在常压并经不同温度热处理制备了TiO₂/SiO₂复合气凝胶光催化剂, 利用XRD、TGA和BET等手段对其微观结构进行表征, 以甲基橙溶液光催化降解实验评价其光催化性能, 研究了热处理温度对TiO₂/SiO₂复合气凝胶的微观结构及光催化性能影响规律. 结果表明: 随着热处理温度升高, TiO₂/SiO₂复合气凝胶中锐钛矿结晶度升高, 晶粒尺寸增大, 比表面积减小, 使TiO₂/SiO₂复合气凝胶对甲基橙溶液的光催化降解活性呈现先升后降的变化趋势. 当热处理温度为700℃左右, 紫外光照20 min TiO₂/SiO₂复合气凝胶对甲基橙溶液的降解率达到95.4%.

关键词: TiO₂/SiO₂复合气凝胶, 热处理温度, 微观结构, 光催化性能

Abstract: TiO₂/SiO₂ composite aerogels were prepared by Sol-Gel method at ambient pressure and heat-treated at different temperatures. The microstructure of TiO₂/SiO₂ composite aerogels was characterized by X-ray diffraction (XRD), thermo gravimetric analyzer (TGA) and N₂ adsorption-desorption. The photocatalytic activity was evaluated by means of photocatalytic degradation of methyl orange under UV irradiation. The effects of heat treatment temperatures on microstructure and photocatalytic activity were investigated. With the increase of heat treatment temperature, the crystallization of anatase and the anatase grain size increase, however, the specific surface area decreases. As a result, the photocatalytic activity of TiO₂/SiO₂composite aerogels is enhanced initially, then decreases with the increase of heat treatment temperature. When the heat treatment temperature is set at about 700℃, the degradation ratio of methyl orange on the TiO₂/SiO₂composite aerogels reaches 95.4% after irradiated by ultraviolet light for 20 min.

Key words: TiO₂/SiO₂ composite aerogels, heat treatment temperature, microstructure, photocatalytic activity

中图分类号:

TB34

刘朝辉, 侯根良, 苏勋家, 郭锋, 肖舟, 贾海鹏. 热处理温度对TiO₂/SiO₂复合气凝胶光催化性能的影响[J]. 无机材料学报, 2012, 27(10): 1079-1083.

LIU Zhao-Hui, HOU Gen-Liang, SU Xun-Jia, GUO Feng, XIAO Zhou, JIA Hai-Peng. Effects of Heat Treatment Temperature on Photocatalytic Activity of TiO₂/SiO₂Composite Aerogels[J]. Journal of Inorganic Materials, 2012, 27(10): 1079-1083.

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热处理温度对TiO₂/SiO₂复合气凝胶光催化性能的影响

Effects of Heat Treatment Temperature on Photocatalytic Activity of TiO₂/SiO₂Composite Aerogels

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