高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (11): 1727.

• 研究简报 • 上一篇    下一篇

TiO2表面包覆SiO2和Al2O3的机理和结构分析

崔爱莉, 王亭杰, 金涌, 肖帅刚, 盖旭东   

  1. 清华大学化工系, 北京, 100084
  • 收稿日期:1997-12-16 出版日期:1998-11-24 发布日期:1998-11-24
  • 通讯作者: 金 涌.
  • 作者简介:崔爱莉,女,36岁,博士研究生.

Mechanism and Structure Analysis of TiO2 Surface Coated with SiO2 and Al2O3

CUI Ai-Li, WANG Ting-Jie, JIN Yong, XIAO Shuai-Gang, GE Xu-Dong   

  1. Department of Chemical Engineering, Tsinghua University, Beijing, 100084
  • Received:1997-12-16 Online:1998-11-24 Published:1998-11-24

关键词: 二氧化钛, 包覆, 二氧化硅, 三氧化铝

Abstract: Photochemical activity of TiO2 can be reduced through surface coating, which favors to increase dispersiveness, weather resistance and antipulverization. The binary coating process of Si and Al to TiO2 was studied experimentally. The isoelectic point of TiO2 in seriflux was measured as pH was equal to 36. Maximum Zeta potential can be got at pH 10 around, which favors to dispersion of particles. Studies on the aggregation rate of Si and Al indicate that, when pHhas a value between 9 and 10, the aggregation rate of silicon acid is small, which favors to form homogeneous and compact membrane, so optimal coating pHvalue is between 9 and 10. According to the difference of 2 p orbital electron binding energy of Ti in XPS before and after being coated, it can be inferred that Si and Al in coating layer combine to TiO2 surface through chemical bond.

Key words: Titanium dioxide, Coating, Silicon dioxide, Alumina

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