物理化学学报 >> 2009, Vol. 25 >> Issue (04): 617-623.doi: 10.3866/PKU.WHXB20090412

研究论文 上一篇    下一篇

溶胶-凝胶-水热法制备Ce-Si/TiO2及其可见光催化性能

陈其凤 姜东 徐耀 吴东 孙予罕   

  1. 中国科学院山西煤炭化学研究所, 煤转化国家重点实验室, 太原 030001; 中国科学院研究生院, 北京 100049
  • 收稿日期:2008-11-19 修回日期:2008-12-17 发布日期:2009-03-31
  • 通讯作者: 徐耀 孙予罕 E-mail:xuyao@sxicc.ac.cn;yhsun@sxicc.ac.cn

Visible Region Photocatalysis of Ce-Si/TiO2 Synthesized Using Sol-Gel-Hydrothermal Method

 CHEN Qi-Feng, JIANG Dong, XU Yao, WU Dong, SUN Yu-Han   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China; Graduate University of the Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2008-11-19 Revised:2008-12-17 Published:2009-03-31
  • Contact: XU Yao, XUN Zhu-Han E-mail:xuyao@sxicc.ac.cn;yhsun@sxicc.ac.cn

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摘要：

以钛酸四正丁酯、正硅酸乙酯、六水硝酸铈为原料, 在140 ℃下通过溶胶-凝胶-水热法水解制备Ce-Si/TiO2. 所得样品用X射线衍射、氮吸附、透射电镜、紫外漫反射、傅里叶变换红外光谱、X射线光电子能谱等测试手段分析, 结果显示400-600 ℃条件下焙烧所有样品均为锐钛矿, 样品具有较大的比表面积, Si和Ce均被引入到TiO2中. 在可见光照射下, 以脱色降解罗丹明B为探针反应, 研究其可见光催化性能, 结果表明, 与未掺杂和单一组分掺杂的二氧化钛相比较, 共掺杂的二氧化钛具有更高的催化性能, 当Ce/Ti和Si/Ti的物质的量比分别为0.010和0.10时,可见光催化性能最好.

关键词: TiO2, Ce-Si共掺杂, 溶胶-凝胶-水热法, 可见光催化, 罗丹明B

Abstract:

Cerium and silica co-doped nanoscale TiO2 particles were synthesized froma complex compound system of tetrabutyl titanate (TBT), tetraethyl orthosilicate (TEOS) and cerium nitrate hexahydrate (CNH) at 140 ℃. The reaction was carried out in a Teflon-lined steel autoclave with water as the solvent using a sol-gel-hydrothermal method. The obtained materials were characterized by X-ray diffraction, nitrogen adsorption, transmission electron microscopy, UV-visible diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy as well as X-ray photoelectron spectroscopy. We found that all materials were in the anatase phase, even those calcined at 600 ℃, and that the samples possessed large surface areas. Furthermore, Si and Ce were successfully doped into the bulk TiO2. The photocatalytic activity of the doped material was determined by the degradation of Rhodamine B (RB) using visible light irradiation. Results showed that both Ce-doped TiO2 and Ce-Si co-doped TiO2 had better visible photoactivity than pure TiO2. These particles were all prepared using the same conditions. The highest photocatalytic activity for these samples was obtained using Ce/Ti and Si/Ti molar ratios of 0.010 and 0.10, respectively. These ratios are then considered to be the optimal doping dosages.

Key words: Titania, Ce-Si co-doped, Sol-gel-hydrothermal method, Visible-photocatalysis, Rhodamine B