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化学进展 2002, Vol. 14 Issue (03): 192- 前一篇   后一篇

• 综述与评论 •

TiO2光催化反应机理及动力学研究进展

唐玉朝;胡春;王怡中   

  1. 中国科学院生态环境研究中心环境水化学国家重点实验室 北京 100085
  • 收稿日期:2001-04-01 修回日期:2001-06-01 出版日期:2002-05-24 发布日期:2002-05-24
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Recent Advances in Mechanisms and Kinetics of TiO2 Photocatalysis

Tang Yuchao;Hu Chun;Wang Yizhong   

  1. State Key Lab of Environmental Aquatic Chemistry, CAS, Beijing 100085, China
  • Received:2001-04-01 Revised:2001-06-01 Online:2002-05-24 Published:2002-05-24
光催化处理环境污染物是基于催化反应过程中的一些自由基对污染物的氧化或还原作用，反应途径通常是HO·攻击或穴直接攻击，对可见光敏感的化合物也可能通过激发态来分解。动力学的表述多数符合L－H模式，广泛研究了L－H模式下的吸附与催化活性的关系，对动力学的研究也是了解其反应机理的重要途径。
关键词： 光催化反应, 机理, 动力学
Fundamental mechanisms of TiO2 heterogeneous photocatalysis for degrading wastes are based on some radical reactions. Under ultraviolet light the photocatalysts produce holes and electrons, which subsequently initiate oxidation and reduction reactions. Holes and electrons can react directly with organic species adsorbed on the surface of the catalysts and also can transform into high-energy chemical species such as hydroxyl radicals. Some organics such as dyes, which are sensitive to visible light, can also be degraded via excited states. Langmuir-Hinshelwood kinetics model describes the degradation rate expressions in terms of the disappearance of compounds. The kinetics of the photocatalysis is not only essential to practical applications but also is key aspect for understanding mechanisms of the photocatalysis.
Key words: photocatalysis, mechanisms, kinetics

中图分类号: 

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