Preparation methods and applications of cadmium sulfide-cobalt hydroxide-graphene photocatalysts

By preparing a cadmium sulfide-cobalt hydroxide-graphene photocatalyst, the problem of low conversion efficiency of existing cadmium sulfide photocatalysts was solved, and a highly efficient photocatalytic effect was achieved in which benzyl alcohol was selectively converted into benzaldehyde and coupled to generate hydrogen. This method is characterized by low cost and environmental friendliness.

CN117563634BActive Publication Date: 2026-05-26JIANGXI UNIV OF SCI & TECH
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Patent Information

Application Number
CN202311566634.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-22
Publication Date
2026-05-26
Estimated Expiration
2043-11-22

AI Technical Summary

Technical Problem

Existing cadmium sulfide photocatalysts suffer from low conversion efficiency in terms of photocatalytic activity and reactive sites, and traditional synthesis strategies are characterized by long reaction times, poor selectivity, expensive reagents, and toxicity.

Method used

A cadmium sulfide-cobalt hydroxide-graphene photocatalyst was prepared by combining CdS with Co(OH)2 and graphene to form a nanocubic block-nanosheet array structure, which promotes charge separation and transfer and improves catalytic performance.

Benefits of technology

The yields of benzaldehyde and hydrogen are significantly improved under mild reaction conditions, with a benzaldehyde selectivity of up to 99.6%. The process is simple, low-cost, and environmentally friendly, providing a sustainable synthetic route for high-value benzaldehyde.

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Abstract

This invention proposes a method for preparing and applying a cadmium sulfide-cobalt hydroxide-graphene photocatalyst. The method includes: first, preparing CdS nanocubes; then, sequentially adding a graphene oxide solution, CdS nanocubes, and cobalt nitrate hexahydrate to deionized water to obtain a mixed solution; finally, adding a solution containing trisodium citrate and hexamethylenetetramine to the mixed solution; and then sequentially subjecting the mixture to oil bath heating and freeze-drying to obtain a cadmium sulfide nanocube-cobalt hydroxide nanosheet array-graphene composite photocatalyst. This invention introduces dual auxiliary catalysts, combining CdS with GR and Co(OH)2 cocatalysts in an appropriate manner to promote charge separation / transfer and inhibit photocorrosion, thereby improving the overall photocatalytic hydrogen production coupled with benzyl alcohol oxidation to benzaldehyde performance, and effectively enhancing the performance of CdS.
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