Preparation method of ZnO / BiOBr composite catalyst

By constructing an S-shaped heterojunction of ZnO/BiOBr composite catalyst, the problems of low visible light utilization, easy recombination of charge carriers, and poor stability of ZnO materials in the field of photocatalysis were solved, achieving efficient photocatalytic degradation of antibiotic pollutants with excellent structural stability and ecological safety.

CN122321901APending Publication Date: 2026-07-03ZHEJIANG NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG NORMAL UNIV
Filing Date
2026-04-14
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing ZnO materials suffer from problems such as low visible light utilization, easy carrier recombination, weak piezoelectric synergistic effect, and poor cycle stability in the field of photocatalysis, making it difficult to achieve efficient photocatalytic degradation of antibiotic pollutants.

Method used

By constructing an S-shaped heterojunction of ZnO/BiOBr composite catalyst and optimizing the molar ratio, a tightly coupled nanoflower-like structure is formed. By utilizing the narrow bandgap characteristics of BiOBr and the piezoelectric properties of ZnO, the effective separation of photogenerated electron-hole pairs and efficient photocatalysis can be achieved.

Benefits of technology

It broadens the photoresponse range, improves light energy utilization, significantly suppresses carrier recombination, enhances the piezoelectric effect, ensures the stability of the catalyst in complex aquatic environments, and achieves efficient degradation and deep mineralization of antibiotics.

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Abstract

This invention discloses a method for preparing a ZnO / BiOBr composite catalyst. The catalyst material is an S-shaped heterojunction structure formed by in-situ composite of ZnO nanorods and BiOBr nanosheets, with a molar ratio of BiOBr to ZnO between 1:2 and 1:8. The preparation method includes the following steps: 1. Dissolving Zn(CH₃COO)₂・2H₂O and NaOH in ethanol, adding polyethylene glycol 400, stirring, and then performing a hydrothermal reaction, followed by washing and drying to obtain ZnO nanorods; 2. Dissolving Bi(NO₃)₃・5H₂O in ethylene glycol to obtain solution A, and dissolving NaBr and polyvinylpyrrolidone in ethylene glycol to obtain solution B; adding ZnO nanorods to solution B, then slowly adding solution B dropwise to solution A, performing a solvothermal reaction, and then centrifuging, washing, and drying to obtain the composite material. This invention aims to solve key technical problems such as low carrier separation efficiency, insufficient activity in treating complex practical water samples, and poor material cycling stability.
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