纳米TiO_2-有机物体系光催化还原Cr(Ⅵ)的研究  

Photocatalytic Reduction of Cr(Ⅵ) in nano TiO_2-organics Co-existed System

作　　者：艾仕云[1] 李嘉庆[1] 杨娅[1] 潘振声[1] 金利通[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《分子催化》2003年第1期29-33,共5页Journal of Molecular Catalysis(China)

基　　金：上海市科委纳米和光科技专项课题(NO.011461061);(No.0114nm072).

摘　　要：研究了Cr( )在纳米TiO2-有机物体系中的光催化还原效果.考察了起始浓度、pH值、催化剂投加量、温度、共存有机物等因素对Cr( )光解速率的影响.揭示了Cr( )多相光催化还原反应的特点,反应过程符合一级动力学规律.酸性条件最有利于Cr( )的还原,在低光强下增加温度可以适当提高Cr( )的还原速率,催化剂的投加量存在一最佳值.溶液中有机物的存在可以作为光生空穴的捕获剂而提高Cr( )的光催化还原效率.The photocatalytic reduction of Cr(Ⅵ) in TiO2organics coexisted system was studied.The effect of various initial concentration of Cr(Ⅵ), varous PH values, TiO2 adding, temperature, coexisted organics on photoredution of Cr(Ⅵ) have been investigated. The characteristics of photocatalytic reduction of Cr(Ⅵ) were verified, the reaction apparently proceeded according to the firstorder kinetics.The acidic solutions were favorable for the photoreduction of Cr(Ⅵ).In the low light intensity, increasing the temperature would increase the reduction rate of Cr(Ⅵ), but was ultimately influenced by the amount of TiO2 present in solutions. The pesence of glucose might act as scavenger for holes and promoted the photocatalytic reduction of Cr(Ⅵ).

关 键 词：纳米TIO2 有机物体系 光催化还原 动力学 Cr(Ⅵ) 葡萄糖 铬(Ⅵ) 二氧化钛 污染物 光催化剂 

分 类 号：X131[环境科学与工程—环境科学] O643.36[理学—物理化学]