摘要
TiO2光催化技术作为一种环境友好的污染治理技术,在废水废气净化、抗菌环保等领域有着广泛的应用前景。阻碍其应用的是它的大禁带宽度(E=3.2eV),不能有效地利用太阳能,因此研究开发可见光响应的TiO2就成为当前光催化剂研究的关键课题。目前,国内外关于TiO2光催化剂的改性技术日益完善,且日趋多样化。本文简单回顾了TiO2光催化的发展历程及其反应机理,概述了提高TiO2光催化性能的改性技术,主要包括金属离子掺杂、表面贵金属沉积、半导体复合、非金属掺杂以及金属络合物和染料光敏化等方法,可以将只能由紫外光激发的TiO2光催化反应红移到可见光区域进行。针对各种改性方法列举了国内外应用的具体实例,提出TiO2的改性是提高光催化反应效率的关键。同时,对TiO2光催化技术目前存在的问题和发展前景做了简单的总结和展望。
As an environmentally friendly pollution management technology, TiO2 photocatalytic technique has a great potential for application as catalysts in the purification of waste water and exhaust gas, the sterilization and environment protection. However, its large energy band gap limits the practical application in the case of natural solar light. The development of visible light responsive TiO2 is one of the most important subjects of the research. The domestic and foreign modifications of TiO2 photoeatalysts have improved steadily and diversely. In this paper, the development and mechanism of TiO2 photocatalysis are reviewed. The methods for promoting the visible light photoeatalytic activity of Ti02 including metal doping, surface deposition of precious metals, semiconductor coupling, nonmetal doping, metal complex and dye sensitizing are discussed, all of which can allow for a UV-light activated photocatalytic reaction under visible light. In addition, some examples are cited, which indicate that the highlight for improving the photoeatalytie efficiency is the modification of TiO2. Finally, the prospects and existing problems of TiO2 photoeatalysis technology are also addressed.
出处
《化学进展》
SCIE
CAS
CSCD
北大核心
2009年第12期2492-2504,共13页
Progress in Chemistry
关键词
TIO2
光催化
掺杂
光敏化
TiO_2
photocatalysis
doping modification
photosensitize
