Preparation method of bismuth molybdate-bismuth oxybromide composite visible photocatalyst

Abstract

The invention relates to a preparation method of a bismuth molybdate-bismuth oxybromide composite visible photocatalyst, and relates to the technical field of inorganic photocatalysis materials. The method is mainly characterized in that bismuth molybdate-bismuth oxybromide precursors are obtained through a one-step technology to form a uniform p-n heterojunction between bismuth molybdate-bismuth oxybromide, so the compounding of electrons and holes is effectively inhibited, thereby the photocatalysis performance is improved. The rhodamine B degradation rate of the bismuth molybdate-bismuth oxybromide composite visible photocatalyst reaches 93.3% in 30 min, the rhodamine B degradation rate of single bismuth molybdate is 70.6% in 30 min, the rhodamine B degradation rate of single bismuth oxybromide is 9.05% in 30 min, the catalyst can be recovered in a simple settlement mode, the recovery rate is 90.9%, the rhodamine B degradation rate of the recovered catalyst reaches 81.9% in 30 min, and the catalyst has good application prospect in photocatalytic degradation of organic pollutants in heterocyclic aromatic dye wastewater.

Description

technical field [0001] The invention relates to a preparation method of a bismuth molybdate-bismuth oxybromide composite visible light catalyst, belonging to the technical field of inorganic photocatalytic materials. Background technique [0002] Solar energy is a clean and economical energy with good prospects for development. For the solution of environmental pollution problems, solar energy also has a significant application prospect. At present, the photocatalytic degradation of organic pollutants by semiconductor materials is one of the research hotspots in water environment purification. Bismuth oxyhalide (BiOX, X=Cl, Br, I), as a p-type semiconductor, has attracted much attention due to its simple preparation method, good photocatalytic effect, and non-toxicity. 2 New semiconductor photocatalytic materials, which have unique layered structure, light absorption performance and photocatalytic activity, are the research hotspots in the field of photocatalysis. Among t...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) the cost of using the hydrothermal method and the alcohol thermal method is high, the process is complicated, the preparation conditions are harsh, and time-consuming and energy-consuming; (2) the monoclinic scheelite is first prepared by the hydrothermal method Compared to BiVO 4 , and then BiVO was prepared by the alcohol-thermal method 4 -BiOBr heterojunction composite photocatalyst, this two-step preparation process easily leads to uneven dispersion of products

This method has the following disadvantages: (1) the cost of preparing the catalyst by the solvothermal method is higher, the purity is lower, and the preparation process is complicated and time-consuming; (2) the activity of the composite catalyst is not high, and under the irradiation of simulated sunlight, It takes 60 minutes for 100mg of catalyst to degrade 10mg / L methylene blue. The self-degradation performance test of methylene blue has not been done, and the efficiency of degrading rhodamine B has not been investigated.

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