Effect of Surface Properties of Titanium Dioxide Particles on the Photocatalytic Oxidation of Phenol
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概要
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The effect of surface properties of titanium dioxide (TiO<SUB>2</SUB>) particles on the photocatalytic oxidation of phenol has been studied. Zeta potential of the TiO<SUB>2</SUB> particles suspended in aqueous phenol solutions showed drastic negative shift on UV light irradiation, while the shift of the zeta potential was not observed in the absence of phenol. The shift of the zeta potential was more marked in acidic solutions, which was resulted from the adsorption of catechol, pyrogallol and carboxylates produced by the photocatalytic degradation of phenol. The rate constant of the phenol degradation was larger in the basic solutions where the adsorption of negatively charged carboxylates on the TiO<SUB>2</SUB> surface was suppressed. Furthermore, the kinetics of phenol degradation on the photo-excited TiO<SUB>2</SUB> surface was able to be explained by the modified LangmuirHinshelwood equation which considers the adsorption of reaction products.
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