Bismuth oxybromide/titanium dioxide composite photocatalyst and preparation method thereof

Abstract

The invention discloses a microwave rapid preparation method of a bismuth oxybromide / titanium dioxide composite catalyst, and belongs to the technical field of visible light catalyst preparation. The preparation method comprises the following steps: adding bismuth nitrate pentahydrate into a mixed solvent composed of acetic acid and water, stirring on a magnetic stirrer until the bismuth nitrate pentahydrate is completely dissolved, adding titanium dioxide, and uniformly stirring to obtain a turbid liquid; dropwise adding a potassium bromide solution into the turbid liquid to obtain a mixed solution; and putting the mixed solution into a microwave reactor, setting the temperature and time for reaction, cooling to room temperature after complete reaction, and centrifugally separating, washing and drying the reaction product to obtain the bismuth oxybromide / titanium dioxide composite catalyst. According to the method, the preparation time of the composite catalyst is shortened, the visible light photocatalytic activity of the single catalyst titanium dioxide and bismuth oxybromide is improved, and the catalytic effect is good.

Description

technical field [0001] The invention belongs to the technical field of preparation of visible light catalysts, and in particular relates to the preparation and application of a bismuth oxybromide / titanium dioxide composite photocatalyst. Background technique [0002] In recent years, water pollution has become increasingly prominent with the development of human society. Among them, dye wastewater is more difficult to treat due to its high chroma and poor biodegradability. The treatment effect of using semiconductor photocatalysts has gradually become an emerging wastewater treatment technology. Bismuth oxybromide has good electronic structure and catalytic performance, with a band gap of about 2.7eV, and can be excited under visible light, but its electron-hole pair recombination rate is relatively high, which limits its photocatalytic activity; titanium dioxide as Common photocatalysts, due to their large band gap, can absorb ultraviolet light and have low utilization of v...

AI Technical Summary

Problems solved by technology

Bismuth oxybromide has good electronic structure and catalytic performance, with a forbidden band width of about 2.7eV, and can be excited under visible light, but its electron-hole pair recombination rate is relatively high, which limits its photocatalytic activity; titanium dioxide is used as Common photocatalysts, due to their large band gap, can absorb ultraviolet light and have low utilization of visible light, which restricts their application.