Photocatalytic removal of bromate with platinum-modified titanium dioxide

Abstract:

To improve the photocatalytic efficiency of TiO₂ for bromate removal, TiO₂ modified with Pt was prepared by impregnation method. The photocatalytic activity of Pt/TiO₂ for bromate removal was studied. The effects of Pt loading, calcination temperature, pH, dissolved oxygen, organic matter on the photocatalytic activity for bromate removal were explored under ultraviolet illumination(365 nm), and the photocatalytic kinetics was also investigated. The results showed that the photosensitization of PtCl₄ significantly improved the photocatalytic activity of TiO₂, and the activity of Pt/TiO₂ was affected by Pt loading, calcination temperature, pH, dissolved oxygen and organic matter. An optimum content of Pt was 0.01％, the optimal calcination temperature was 400 ℃, the activity was increased quickly with a decrease of pH and inhibited by dissolved oxygen and ethanol. The photocatalytic kinetics followed the first-order kinetic equation.