Preparation Characterization and Photocatalytic Activity of Bi2WO6/La2WO6/TiO2
Bismuth tungstate catalyst was prepared by combining bismuth nitrate pentahydrate with sodium tungstate dihydrate by hy-drothermal method,adding lanthanum nitrate and butyl titanate,and Bi2WO6/La2WO6/TiO2 catalyst was prepared by hydrothermal method and gel-sol method.The catalyst was characterized by X-ray diffraction,infrared spectroscopy,and UV visible diffuse reflectance spec-troscopy;Exploring the photocatalytic activity and optimal preparation conditions of rhodamine B as a pollutant under xenon lamp radia-tion.The catalyst characterization results showed that the crystallinity and peak strength of Bi2WO6/La2WO6/TiO2 catalyst were good.The characteristic peaks of the infrared spectra of pure Bi2WO6 and Bi2WO6/La2WO6/TiO2 were approximately similar.The band gap width of Bi2WO6/La2WO6/TiO2 catalyst was 1.36 eV,less than the band gap of Bi2WO6(1.64eV).The experimental results of photocatalytic activity showed that the optimal photocatalytic activity was achieved with the molar ratio of Bi2WO6:La(NO3)3·6H2O of 1:4.2,reaction time of 12 hours,and calcination temperature of 120℃.When the catalyst dosage was 0.1 g and the initial concentration of Rhodamine B was 50 mg/L,the photocatalytic conditions were optimal.The photocatalytic degradation rate could reach 95%after 180 minutes.
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