华东师范大学学报(自然科学版) ›› 2004, Vol. 2004 ›› Issue (3): 76-81.

• 化学 • 上一篇    下一篇

纳米TiO2光诱导产生羟基自由基的ESR研究

艾仕云1，2， 杨 娅1, 鲜跃仲1， 李嘉庆1， 李洛平1, 金利通1   

  1. 1. 华东师范大学 化学系，上海 200062； 2. 山东农业大学 化学与材料科学学院，泰安 271018
  • 收稿日期:2003-06-30 修回日期:2003-09-18 出版日期:2004-09-25 发布日期:2004-09-25
  • 通讯作者: 艾仕云

ESR Study on the Photoinduced Production of Hydroxyl Radicals by Nano-TiO2

AI Shi-yun1,2, YANG Ya1, XIAN Yue-zhong1,LI Jia-qing1, LI Luo-ping1, JIN Li-tong1   

  1. 1. Department of Chemistry, East China Normal University, Shanghai 200062， China; 2. College of Chemistry and Material Science, Shandong Agricultural University, Taian 271018, China
  • Received:2003-06-30 Revised:2003-09-18 Online:2004-09-25 Published:2004-09-25
  • Contact: AI Shi-yun

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.

关键词: 光催化反应, ESR, 自旋捕捉, 羟基自由基, 甘氨酸, 光催化反应, ESR, 自旋捕捉, 羟基自由基, 甘氨酸

Abstract: 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.

Key words: ESR, spin-trap, hydroxyl radical, glycine, photocatalytic reaction, ESR, spin-trap, hydroxyl radical, glycine

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