高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (10): 1547.

• 论文 • 上一篇    下一篇

TiO2纳米晶光催化降解铬酸根离子的研究

张青红, 高濂, 郭景坤   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海 200050
  • 收稿日期:1999-08-21 出版日期:2000-10-24 发布日期:2000-10-24
  • 通讯作者: 高　濂(1945年出生),男,博士,教授,博士生导师,从事纳米材料研究.
  • 基金资助:

    上海市科委新材料研究中心(批准号:98JC14021)资助

Heterogeneous Photocatalytic Reaction of Cr(Ⅵ) Reduction on Nanosized Titania

ZHANG Qing-Hong, GAO Lian, GUO Jing-Kun   

  1. The State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:1999-08-21 Online:2000-10-24 Published:2000-10-24

PDF (PC)

摘要： 以二氧化钛为光催化剂,研究了溶液的pH值、铬酸根离子的初始浓度、通入的气体种类、氧化钛的载量等因素对铬酸根离子降解率的影响.同时合成了粒径小于10nm的锐钛矿相和金红石相氧化钛纳米晶来考察晶相和尺寸效应对降解率的影响.结果表明,锐钛矿相的催化活性高于金红石相,两者的催化活性均大大高于市售的氧化钛微粉.

关键词: 光催化, 氧化钛, 尺寸效应, 铬酸根

Abstract: The influences of the pH value of solutions, initial concentrations of chromate, purged gas and photocatalysts loading on clean-up efficiency for Cr(Ⅵ) have been investigated. In order to study the influence of phase and size effect on the photocatalytic activities, anatase and rutile TiO2 nanocrystallites were prepared, whose particle size is 9.5 nm(BETsurface area 133.4 m2/g) for anatase phase and 7.5 nm(BET surface area 167.6 m2/g) for rutile phase, respectively. The results of the photocatalytic reactions indicate that the phtocatalytic activity of anatase crystallite is higher than that of rutile crystallite, however, both anatase and rutile nanosized TiO2 powders have higher photocatalytic activities than those of commercial TiO2 powder.

Key words: Photocatalysis, Titania, Size effect, Chromate

中图分类号: 

TrendMD: