▎ 摘　　要

NOVELTY - Preparing graphene/cadmium sulfide-copper-zinc composite photocatalyst comprises e.g. (1) adding graphene oxide (GO) to deionized water, ultrasonically stripping for 1-3 hours, and preparing 0.5-2 mg/ml graphene oxide-deionized water dispersion; (2) respectively adding soluble zinc salt and soluble copper salt to resulting graphene oxide, stirring and dissolving in the deionized water dispersion, the amount of the soluble zinc salt and the soluble copper salt is 0.02-0.04 mmol of the total amount of zinc ion (Zn2+) and copper ion (Cu2+) added per ml of the dispersion, and continuously stirring; (3) adding thiourea to the mixed solution, the amount of the substance added with thiourea is 2-4 times the amount of the total substance of zinc ion and copper ion, stirring to dissolve;stirring and refluxing; and (4) after the completion of reaction, naturally cooling, centrifuging, and separately ultrasonically washing the precipitate with deionized water and absolute ethanol, and drying. USE - The method is useful for preparing graphene/cadmium sulfide-copper-zinc composite photocatalyst. ADVANTAGE - The method: does not need to use organic solvent, is environment-friendly, has simple production technique, safe production process, a reaction parameter is easy to control and easy to realize large-scale industrial production. The composite photocatalyst: has good compounding effect, large specific surface area, strong anti-light corrosion ability, high visible light photocatalytic activity, and can fully utilize sunlight to photocatalytic degradation of environmental pollutants. DETAILED DESCRIPTION - Preparing graphene/cadmium sulfide-copper-zinc composite photocatalyst comprises (1) adding graphene oxide (GO) to deionized water, ultrasonically stripping for 1-3 hours, and preparing 0.5-2 mg/ml graphene oxide-deionized water dispersion; (2) the ratio of the amount of zinc to copper in the copper sulfide zinc ZnxCu(1-x)S, that is, x:(1-x), respectively adding the soluble zinc salt and the soluble copper salt to the graphene oxide obtained in the step (1), stirring and dissolving in the deionized water dispersion, the amount of the soluble zinc salt and the soluble copper salt is 0.02-0.04 mmol of the total amount of zinc ion (Zn2+) and copper ion (Cu2+) added per ml of the dispersion, and continuously stirring for 30-60 minutes to obtain the mixed solution; (3) adding thiourea to the mixed solution, the amount of the substance added with thiourea is 2-4 times the amount of the total substance of zinc ion and copper ion, stirring to dissolve; then, stirring and refluxing at 60-100 degrees C for 1-3 hours; and (4) after the completion of reaction, naturally cooling to room temperature, centrifuging, and separately ultrasonically washing the obtained precipitate with deionized water and absolute ethanol, and drying to obtain a graphene/copper-zinc-zinc composite photocatalyst, that is, RGO/ZnxCu1-xS, and where the catalyst is represented by RGO/ZnxCu(1-x)S, where x is greater than or equal to 0.1 and less than or equal to 0.2.