化工进展 ›› 2016, Vol. 35 ›› Issue (08): 2446-2454.DOI: 10.16085/j.issn.1000-6613.2016.08.22

• 工业催化 • 上一篇    下一篇

光催化剂TiO2改性的研究进展

刘文芳, 周汝利, 王燕子   

  1. 北京理工大学化工与环境学院, 北京 100081
  • 收稿日期:2015-11-25 修回日期:2016-01-28 出版日期:2016-08-05 发布日期:2016-08-05
  • 通讯作者: 刘文芳(1977—),女,博士,副教授。E-mail:liuwenfang@bit.edu.cn。
  • 作者简介:刘文芳(1977—),女,博士,副教授。E-mail:liuwenfang@bit.edu.cn。

Research progress on modification of TiO2 photocatalyst

LIU Wenfang, ZHOU Ruli, WANG Yanzi   

  1. School of Chemical Engineering & Environment, Beijing Institute of Technology, Beijing 100081, China
  • Received:2015-11-25 Revised:2016-01-28 Online:2016-08-05 Published:2016-08-05

摘要: TiO2具有光催化性能好、化学性质稳定、毒性低、价格低廉等优点,但由于禁带较宽,只对紫外光有响应,且电子和空穴容易复合,导致光催化活性和效率降低。本文介绍了TiO2的几种主要改性方法的最新研究进展。表面沉积贵金属、半导体复合、染料敏化可以降低TiO2的禁带宽度,增加其响应波长,提高太阳光的利用率。离子掺杂可使得TiO2晶体表面产生缺陷,抑制光生电子和空穴的复合,增加表面活性中心的数量。碳纳米管和石墨烯掺杂则能够提高TiO2对可见光的吸收率,扩大光响应范围,同时加快电子传输,减少载流子复合,提高催化效率。指出石墨烯作为新型掺杂材料具有很大的发展潜力,TiO2基多组分复合型光催化剂可获得比单种组分表面改性或者掺杂TiO2更好的效果。最后介绍了TiO2表面的亲/疏水改性研究进展。

关键词: 催化剂, 二氧化钛, 活性, 表面改性, 掺杂

Abstract: TiO2 has such advantages as excellent photocatalytic performance,high chemical stability,low toxicity and price. However,it only responds to UV light due to its wide forbidden band,and the electrons and holes are prone to recombination,leading to a decrease of catalytic activity and efficiency. This paper introduced the latest research progress on several main modification methods of TiO2. Surface deposition of noble metal,semiconductor composite and dye sensitization can reduce the width of the forbidden band,increase the response wavelength and make full use of the sunlight. Ion doping can make TiO2 crystal surface generate the defects,restrain the recombination of photoproduction electrons and holes,and increase the number of surface active centers. Carbon nanotube and graphene modification can improve light absorption of TiO2 to the visible,extend the response range, speed up the electronic transmission,reduce the carrier recombination,and upgrade the catalytic efficiency. As a new doping material graphene has great potentials,and TiO2-based multi-components composite photocatalysts are promising to achieve better catalytic properties than single-component surface modified or doped TiO2. Finally,research progress on hydrophilic/hydrophobic surface modification of TiO2 was reviewed.

Key words: catalyst, titanium oxide, reactivity, surface modification, doping

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