BiVO4-TiO2 Synthesized by Ultrasound Assisted Mixing for Photocatalytic Oxidation under Visible Light
Photocatalytic oxidation technology is widely used for the catalytic degradation of gaseous pollutants and recognized as an effective treatment technology for low concentration indoor formaldehyde pollution.TiO2,which has strong oxidation capacity,low cost and non-toxic advantages,is the most widely used photocatalyst but can only be excited by ultraviolet light.BiVO4 has a suitable band gap energy and diversified crystal structure,which can improve the reactivity of the catalyst in visible light.In this study,four kinds of surfactants were introduced to BiVO4 and TiO2 for constructing the heterojunction structure,and the effects of surfactant type,incorporation,and mixing method on the formaldehyde oxidation of BiVO4-TiO2 were investigated.XRD,BET,PL,UV-Vis and XPS techniques were used to analyze the microstructure and performance of the catalyst.The results showed that the BiVO4-TiO2 catalyst prepared with NaOH as a surfactant exhibited the best performance.The 48 h formaldehyde removal rate reached 97.1%,indicating good stability.This was attributed to its high specific surface area,rich pore size distribution and heterojunction structure formed between BiVO4 and TiO2 that improved carrier separation efficiency while reducing electron-hole recombination rates.
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