三氯乙烯预处理的TiO_2薄膜上挥发性有机物的光催化反应  

Photocatalytic Reaction of Volatile Organic Compounds on TiO_2 Film Pretreated by Trichloroethylene

作　　者：赵莲花[1] 伊藤公纪[2] 村林真行[2] 近藤正志[2] 文学洙[3] 

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 [3]横滨国立大学仪器分析中心

出　　处：《催化学报》2004年第8期669-672,共4页

基　　金：国家教委回国留学基金资助项目

摘　　要：制备了TiO2 薄膜催化剂 ,并用三氯乙烯对其进行了预处理 ;采用FT IR ,GC/MS及XPS等技术研究了三氯乙烯预处理的TiO2 薄膜上挥发性有机物的光催化反应 .结果表明 ,三氯乙烯预处理能加快某些挥发性有机物的光催化反应 .这是由于氯作为三氯乙烯气相光催化分解反应的中间产物吸附在催化剂表面 ,成为反应的活性物种引发挥发性有机物发生游离基反应 ,从而提高其气相光催化反应速率 .Effect of pretreatment of TiO 2 film with trichloroethylene on gas-phase photocatalytic oxidation of volatile organic compounds (VOCs) was investigated by FT-IR and GC-MS techniques, and the surface state of TiO 2 film catalyst was studied by XPS. The photocatalytic oxidation of VOCs on TiO 2 film was enhanced by the pretreatment with trichloroethylene. The chlorine resulted from the pretreatment was one of surface species adsorbed on TiO 2 film, which induced the chain reaction for photocatalytic oxidation of VOCs and accelerated the reaction rate. In addition,the chlorine adsorbed on TiO 2 film promoted the hydroxyl groups adsorbed on the surface of TiO 2 film to form anions and inhibited the recombination of electrons and holes.

关 键 词：三氯乙烯 预处理 二氧化钛薄膜 挥发性有机物 光催化氧化 

分 类 号：O643[理学—物理化学]