Journal of East China Normal University(Natural Sc ›› 2004, Vol. 2004 ›› Issue (3): 76-81.

• Article • Previous Articles     Next Articles

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

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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