Preparation complex photocatalyst of modified TiO_2/K_2Ti_6O_(13) by tungstosilicic acid and study its degradation of methyl orange

摘要

With potassium titanate (VI) whisker as carrier, and silicotungstic acid (H_4SiW_(12)O_(40)) as modified reagent, the compound photocatalyst H_4SiW_(12)O_(40)/TiO_2/K_2Ti_6O_(13) was prepared by sol-gel-dipping method. UV-vis spectra showed that the compound photocatalyst had strongly responded to UV light and had some absorbency of visible light. The photocatalytic activity was evaluated by degradation of methyl orange under UV light. The photocatalytic influences of initial concentration of methyl orange, the dosage of catalyst, pH value, temperature, intensity of light were investigated. The results indicate that the photocatalyst of H_4SiW_(12)O_(40)/TiO_2/K_2Ti_6O_(13) has higher photocatalytic activity. The degradation rate of methyl orange could reach over 85% under the experimental conditions.