物理化学学报 >> 1999, Vol. 15 >> Issue (09): 784-788.doi: 10.3866/PKU.WHXB19990903

研究论文 上一篇    下一篇

TiCl4溶胶凝胶法制备TiO2纳米粉体

朱永法, 张利, 高翀, 姚文清, 曹立礼   

  1. 清华大学化学系,北京 100084
  • 收稿日期:1998-10-09 修回日期:1999-01-18 发布日期:1999-09-15
  • 通讯作者: 朱永法

The Preparation of Nanosized Anatase TiO2 Powder by Using TiCl4 a Precursor

Zhu Yong-Fa, Zhang Li, Gao Chong, Yao Wen-Qing, Cao Li-Li   

  1. Department of Chemistry,Tsinghua University,Beijing 100084
  • Received:1998-10-09 Revised:1999-01-18 Published:1999-09-15
  • Contact: Zhu Yong-Fa

摘要:

利用TiCl4的乙醇溶液作为前驱体, 运用溶胶凝胶法制备了TiO2 纳米粉体 .研究结果表明 ,在TiCl4与乙醇混合成溶液的过程中 ,TiCl4即与乙醇及乙醇中的微量水发生醇解和部分水解脱氯反应形成钛酸酯 .在随后的成胶化过程中 ,则主要是钛酸酯吸收气氛中的水气 ,脱去乙醇基形成Ti-OH键并发生缩脱水聚合形成无机聚合物溶胶 .增加成胶化时间 ,可以促进乙醇基的脱去和无机聚合物的形成 ,促进锐钛矿TiO2 纳米颗粒的形成.

关键词: TiO2, 溶胶凝胶, TiCl4

Abstract:

Nanosized anatase TiO_2 powder was prepared by using TiCl_4 ethanol solution as a precursor. The distribution of particle size was homogeneous, and the particle size of TiO_2 was about 10 nm after the precursor was calcined at 773 K for 1 h. The gelatinizing mechanism of TiCl_4 in ethanol solution can be described as followings. When TiCl_4 was mixed with ethanol, the former reacted with ethanol to form Ti(OCH_2CH_3) 4 species which during the gelatinizing process, absorbed water from the atmosphere to form Ti(OH)_4 precursor. The formation of inorganic polymer of Ti(OH) 4 was intensified with the increase of gelatinizing time, but the organic component decreased. The formation of anatase TiO_2 can also be promoted by the increase of gelatinizing time.

Key words: Titanium dioxide, Sol-gel, TiO2