纳米TiO_2光诱导产生羟基自由基的ESR研究  

ESR Study on the Photoinduced Production of Hydroxyl Radicals by Nano-TiO_2

作　　者：艾仕云[1,2] 杨娅[1] 鲜跃仲[1] 李嘉庆[1] 李洛平[1] 金利通[1] 

机构地区：[1]华东师范大学化学系 [2]山东农业大学化学与材料科学学院,泰安271018

出　　处：《华东师范大学学报（自然科学版）》2004年第3期76-81,共6页Journal of East China Normal University(Natural Science)

基　　金：科技部项目(2002AA6011330)上海市科委项目(021409012)

摘　　要：在纳米TiO2光催化氧化体系中,添加无机氧化物,能有效地捕获电子,增加溶液中羟基自由基浓度,提高纳米TiO2的光催化氧化能力.该文以DMPO为羟基自由基捕获剂,利用自旋捕捉-电子自旋共振(ESR)方法研究无机氧化物K2S2O8对纳米TiO2光催化氧化体系中产生羟基自由基的关系,在此基础上探讨了甘氨酸光催化氧化反应的机理.In nano TiO2 photocatalytic oxidation system, adding inorganic oxidizing species can efficiently trap photogenerated electrons and increase concentrations of hydroxyl radicals in the solution and enhance the photocatalytic oxidation rate of nano TiO2 to different organic matter. In this study, correlation of the production of hydroxyl radicals and the photoinduced electron tranfer of nano-TiO2 by inorganic oxidizing species (K2S2O8) was verified by means of the free radicals measured by spin trapping-ESR methods in which DMPO was selected as the spin-trap. The photocatalytic oxidation mechanism of glycine was studied.

关 键 词：光催化反应 ESR 自旋捕捉 羟基自由基 甘氨酸 

分 类 号：O632.32[理学—高分子化学]