紫外线预照射对TiO_2上三氯乙烯气相光催化氧化反应的影响  

Effect of Ultraviolet Pre-irradiation on Photocatalytic Oxidation of Trichloroethylene over TiO_2 in Gas Phase

作　　者：赵莲花[1] 山下孝子[2] 伊藤公纪[2] 村林真行[2] 

机构地区：[1]延边大学理工学院,吉林延吉133002 [2]横滨国立大学大学院环境情报研究院

出　　处：《催化学报》2005年第4期307-310,共4页

基　　金：国家教委留学回国基金资助项目.

摘　　要：用紫外线照射法对TiO2光催化剂进行了预处理,并利用热重分析比较了预照射法和高温加热法对TiO2上三氯乙烯气相光催化氧化反应的影响.结果表明,紫外线预照射可加快三氯乙烯的气相光催化反应.这可能是紫外线预照射使TiO2的表面状态和表面结构发生了变化,使催化剂表面活性基团羟基自由基的量增加所致.The effects of UV pre-irradiation and heat treatment at high temperature on the photocatalytic activity of TiO2 for the oxidation of trichloroethylene in gas phase were studied. The results showed that photocatalytic oxidation of trichloroethylene on TiO2 was accelerated by the UV pre-irradiation. The mass loss of the TiO2 catalyst after UV pre- irradiation was obviously less than that after beat treatment, however, its photocatalytic activity, was resemble under the two kinds of pre-treatments. The amount of hydroxyl free radicals on the TiO2 surface was changed by UV irradiation. This may result from the change in the surface structure of TiO2 and the increase in the concentration of hydroxyl free radicals during the UV irradiation.

关 键 词：紫外线预照射 二氧化钛 三氯乙烯 气相光催化氧化 

分 类 号：O643[理学—物理化学] X7[理学—化学]