中文摘要：

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．

英文摘要：

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 ： trichloroeth- ylene 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.