ESR Analysis on the Ozone Enhanced Photocatalytic Activity of Aqueous Nanosized Titanium Dioxide Suspensions

doi:10.7517/j.issn.1674-0475.2008.06.460

Abstract

Abstract: The reaction activities of UV,O₃,TiO₂/O₃,TiO₂/UV/O₂,UV/O₃ and TiO₂/UV/O₃ six different processes were tested in aqueous or dimethylsulfoxide (DMSO) suspensions using elec-tron spin resonance (ESR) technique with 5,5-dimethyl-1-pyrroline N-oxide (DMPO) spin trap, in the meantime,the effect of different reaction time,amount of catalyst used and dissolved oxygen on the formation of·OH and·O₂^- in TiO₂/UV/O₃ process were discussed.Result showed that the concentration of·OH and·O₂^- increased obviously by adding ozone.The relative intensity of DM-PO-·OH and DMPO-·O₂^- in six different conditions was TiO₂/UV/O₃>TiO₂/UV/O₂>UV/O₃>UV>TiO₂/O₃>O₃ and TiO₂/UV/O₃≈TiO₂/UV/O₂>TiO₂/O₃>UV>UV/O₃>O₃,respec-tively.At last,the DMPO-·O₃^- was successfully detected in TiO₂/UV/O₃ process.

Key words: titanium dioxide, photocatalysis, ozone, ESR, radical

CLC Number:

YE Miao-miao, CHEN Zhong-lin, SHEN Ji-min, BEN Yue, LIU Xiao-wei. ESR Analysis on the Ozone Enhanced Photocatalytic Activity of Aqueous Nanosized Titanium Dioxide Suspensions[J]. Imaging Science and Photochemistry, 2008, 26(6): 460-467.

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