Abstract
Effect of crystalline structure, anatase and rutile, on the production of OH・ and O₂・- by TiO₂ photocatalytic reactions was investigated. The OH・ radical free from the TiO₂ surface was monitored by the fluorescence intensity of 2-hydroxyl terephthalic acid produced by the reaction with terephthalic acid. Superoxide radical was detected by the chemiluminescence probe method with luminol. Formation rate of OH・ with rutile photocatalysts was significantly lower than that with anatase photocatalysts. By the addition of H₂O₂, the formation rate of OH・ was significantly increased for rutile and for anatase mixed with rutile by 10-20 % , while pure anatase showed opposite tendency. We suggest that the adsorption structure of H₂O₂ on the rutile TiO₂ surface is preferable to produce OH・. In photocatalytic production of O₂・^-, rutile surpassed anatase in stabilizing the produced O₂・-. On H₂O₂ addition, anatase surpassed rutile in the photocatalytic activity to produce O₂・^- from H₂O₂.
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