高等学校化学学报

高等学校化学学报

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原位红外光谱法研究三氯乙烯在TiO2表面的光催化降解

江传锐1, 郑春莉1, 李新勇1,2, 万利远1, 张文爽1, 陈国华2
  

  1. 1. 大连理工大学环境与生命学院, 工业生态与环境工程教育部重点实验室, 精细化工国家重点实验室, 大连 116023; 2. 香港科技大学化工系, 九龙)
  • 收稿日期:2008-07-03 修回日期:1900-01-01 出版日期:2009-03-10 发布日期:2009-03-10
  • 通讯作者: 李新勇

In situ FTIR Study on Photo-catalytic Degradation of Trichloroethylene over TiO2

JIANG Chuan-Rui1, ZHENG Chun-Li1, LI Xin-Yong1,2*, WANG Li-Yuan1, ZHANG Wen-Shuang1, CHEN Guo-Hua2   

  1. 1. State Key Laboratory of Fine Chemical, Key Laboratory of Industrial Ecology and Environmental Engineering of Ministry of Education, School of Environmental & Biological Science & Technology, Dalian University of Technology, Dalian 116023, China;2. Department of Chemical Engineering, Hong Kong University of Science & Technology, Kowloon, Hong Kong, China)
  • Received:2008-07-03 Revised:1900-01-01 Online:2009-03-10 Published:2009-03-10
  • Contact: LI Xin-Yong

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被引次数

11

摘要： 通过原位红外光谱技术在线研究了三氯乙烯的直接光降解以及三氯乙烯在TiO2表面的气相光催化降解. 研究结果表明, UV/TiO2体系比UV体系具有更强的降解能力. 在三氯乙烯的光催化降解过程中, 发现有二氯乙酰氯、二氧化碳、一氧化碳、水、氯化氢和光气等中间产物生成. 根据反应结果, 分析了三氯乙烯在TiO2表面的气相光催化降解机理: 三氯乙烯在羟基自由基等作用下生成中间产物二氯乙酰氯, 二氯乙酰氯进一步发生自由基反应, 最终降解为二氧化碳、一氧化碳、水、氯化氢和光气.

关键词: 原位红外光谱, 光催化, 三氯乙烯, 二氧化钛

Abstract: Photo-degradation and gas-phase photocatalytic degradation on TiO2 of trichloroethy-lene were stu-died by in situ infrared spectroscopy. The results show that UV/TiO2 has a higher degradation capacity than UV on trichloroethylene. In the photocatalytic degradation process, dichloroacetyl chloride, carbon dioxide, carbon monoxide, water, hydrogen chloride and phosgene were detected. Base on the in situ FTIR spectra in different stages, the reaction mechanism of trichloroethylene photocatalysis on TiO2 was proposed: trichloroethylene was oxidized by hydroxyl radical and other free radical and formed to dichloroacetyl chloride. Finally, dichloroacetyl chloride was converted further to carbon dioxide, carbon monoxide, water, hydrogen chloride and phosgene.

Key words: In situ FTIR, Photocatalysis, Trichloroethylene, TiO2

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