三氯乙烯预处理的TiO2薄膜上挥发性有机物的光催化反应

 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.

Photocatalytic Reaction of Volatile Organic Compounds on TiO2 Film Pretreated by Trichloroethylene

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.