物理化学学报 >> 2010, Vol. 26 >> Issue (05): 1330-1336.doi: 10.3866/PKU.WHXB20100520

催化和表面结构 上一篇    下一篇

高分散TiO2/SBA-15的制备及光催化性能

张书翠, 姜东, 唐涛, 李君华, 徐耀   

  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:2009-12-10 修回日期:2010-01-13 发布日期:2010-04-29
  • 通讯作者: 姜东, 徐耀 E-mail:xuyao@sxicc.ac.cn; jdred@sxicc.ac.cn

Synthesis and Photocatalytic Activity of Highly Dispersed TiO2/SBA-15

ZHANG Shu-Cui, JIANG Dong, TANG Tao, LI Jun-Hua, XU Yao   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China; Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2009-12-10 Revised:2010-01-13 Published:2010-04-29
  • Contact: JIANG Dong, XU Yao E-mail:xuyao@sxicc.ac.cn; jdred@sxicc.ac.cn

摘要:

提出了一种制备高分散TiO2/SBA-15光催化剂的新方法. 以钛酸四正丁酯(TB)和羧基改性的SBA-15(COOH/SBA-15)为原料, 利用COOH/SBA-15表面上高分散的羧基与TB的配合作用将TB锚定, 经过溶剂热及焙烧处理制得TiO2/SBA-15光催化剂. 采用粉末X射线衍射(XRD), N2吸脱附, 傅里叶变换红外光谱(FT-IR), 透射电镜(TEM)等对所得催化剂进行了表征. 结果表明: 所得TiO2/SBA-15光催化剂为高结晶度的锐钛矿晶型, TiO2均匀地分散在SBA-15表面, TiO2/SBA-15光催化剂保持较好的介孔特征结构, 具有较大比表面积. 以降解罗丹明B(RhB)为探针反应, 考察了所得TiO2/SBA-15光催化剂的光催化性能. 与后处理浸渍法制备的光催化剂相比, 本文制备的TiO2/SBA-15光催化剂表现出了更加优越的光催化性能.

关键词: 光催化, 羧基改性, TiO2, SBA-15, 溶剂热

Abstract:

Highly dispersed TiO2/SBA-15 photocatalysts were successfully synthesized by solvothermal treatment using titanium n-butoxide (TB) and carboxylate-modified SBA-15 (COOH/SBA-15) as raw materials. The good dispersive carboxyl groups of COOH/SBA-15 coordinated with TB molecules to anchor them. After solvothermal treatment, the TB molecules were transformed into TiO2 nanoparticles and finally formed the TiO2/SBA-15 products. The products were calcined to improve the crystallization of TiO2 and to remove the organic compounds. As-obtained TiO2/SBA-15 photocatalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption, Fourier transform infrared (FI-IR) spectroscopy, and transmission electron microscopy (TEM). Analytical results showed that the as-obtained TiO2/SBA-15 photocatalysts possessed a better mesoporous structure and a larger specific surface area. The highly crystalline anatase TiO2 nanocrystals dispersed well on the surface of SBA-15. RhodamineB (RhB), as a photodegradation target, was used to evaluate photocatalytic performance under UV light irradiation. The as-obtained TiO2/SBA-15 photocatalysts exhibited much better photocatalytic activity compared with the photocatalysts prepared by a post-synthesis impregnation method.

Key words: Photocatalysis, Carboxylate-modified, TiO2, SBA-15, Solvothermal

MSC2000: 

  • O643