Preparation and Photocatalytic Performance of Complex Photocatalyst H3PW12O40/TiO2/Na2Ti3O7

A new carrier of catalyst-Na₂Ti₃O₇ whisker was selected and TiO₂/Na₂Ti₃O₇ was prepared by sol-gel method, then complex photocatalyst H₃PW₁₂O₄₀/Na₂Ti₃O₇ was prepared by dipping way. SEM photographs showed the production was covered well, TiO₂ was anatase type and H₃PW₁₂O₄₀ was Keggin structure. UV-vis RDS showed wavelength range unfolded red shifts. The photocatalytic activity of H₃PW₁₂O₄₀/TiO₂/Na₂Ti₃O₇ was studied in a self-made reaction devices with methyl purple as the substrate, the photocatalytic activity was researched by the decolorizing rate effect of light intensity, temperature of system, aeration volume quantum, simulant pollutant concentration, and the dosage of catalyst. The experimental results directed that the complex photocatalyst shows good activity. The decolorizing rate of methyl purple achieved over 94% when its concentration was 10 mg/L and illumination intensity was 250 W in 80 minutes. Compared to TiO₂/Na₂Ti₃O₇ the decolorizing rate was improved 32.3% (at 80 minute) and 82.4% (at 10 minute) by the photocatalyst of H₃PW₁₂O₄₀/TiO₂/Na₂Ti₃O₇.