▎ 摘　　要

NOVELTY - Preparing cadmium sulfide/copper iron sulfide/reduced graphene oxide (CdS/Cu5FeS4/RGO) nanocomposite photocatalyst involves using catalyst, copper iron sulfide (Cu5FeS4) and reduced graphene oxide (RGO) as co-catalysts, and then coupling with cadmium sulfide (CdS) to obtain the target photocatalyst, where preparing CdS nanorods by solvothermal method, calculating according to molecular weight and weighing cadmium chloride pentahydrate (CdCl2.5H2O) and thiourea into test tubes, adding ethylenediamine solution, and performing ultrasonic treatment. The mixed solution of cadmium chloride and ethylenediamine are mixed with the mixed solution of thiourea and ethylenediamine, shaked uniformly and continue ultrasound. The mixed liquid is transferred to a stainless steel reactor with polytetrafluoroethylene (PTFE) lining, then reacted for 48 hours at a constant temperature of 160 degrees C, and after the reaction is over, after centrifugal washing and drying. USE - Method for preparing CdS/Cu5FeS4/RGO nanocomposite photocatalyst for photocatalytic hydrogen production and photodegradation of organic pollutants (claimed). ADVANTAGE - The obtained ternary nanocomposite visible light photocatalyst has a clear structure and a clear composition, and Cu5FeS4 has a relatively narrow band gap and excellent electronic conductivity. RGO can increase the diffusion range of photo-generated carriers, and in this ternary composite visible light catalyst, Cu5FeS4 and RGO are used as co-catalysts, which can effectively suppress photo-generated electrons. The recombination of hole pairs enhances the visible light catalytic activity, which is a low-cost photocatalyst with broad development prospects. DETAILED DESCRIPTION - Preparing cadmium sulfide/copper iron sulfide/reduced graphene oxide (CdS/Cu5FeS4/RGO) nanocomposite photocatalyst involves using catalyst, copper iron sulfide (Cu5FeS4) and reduced graphene oxide (RGO) as co-catalysts, and then coupling with cadmium sulfide (CdS) to obtain the target photocatalyst, where preparing CdS nanorods by solvothermal method, calculating according to molecular weight and weighing cadmium chloride pentahydrate (CdCl2.5H2O) and thiourea into test tubes, adding ethylenediamine solution, and performing ultrasonic treatment. The mixed solution of cadmium chloride and ethylenediamine are mixed with the mixed solution of thiourea and ethylenediamine, shaked uniformly and continue ultrasound. The mixed liquid is transferred to a stainless steel reactor with polytetrafluoroethylene (PTFE) lining, then reacted for 48 hours at a constant temperature of 160 degrees C, and after the reaction is over, after centrifugal washing and drying, the yellow solid obtained is collected and ground into a powder for later use. The solvothermal method is used to synthesize Cu5FeS4. The copper source, iron source and sulfur source are dissolved in the ethylenediamine solvent according to the molar ratio, then mixed uniformly and transferred to a stainless steel reactor lined with polytetrafluoroethylene to react for 24 hours at 180 degrees C, and after the reaction, the target product can be obtained by centrifugal washing, drying and other steps. The Hummers method is used to prepare oxidized graphene (GO). The CdS is weighed uniformly and dispersed in deionized water, ultrasonically treated, and then added GO. The mixed solution is transferred to a stainless steel reactor with a polytetrafluoroethylene lining, and reacted at 160 degrees C for 6 hours. The reactor is naturally cooled to room temperature, the Cu5FeS4 sample is added in proportion, stirred, and then the mixed solution is transferred to a stainless steel reactor with a polytetrafluoroethylene lining, and reacted at 180 degrees C for 3 hours. The reaction is over, collected the obtained solids, centrifuged them with ethanol or deionized water for 3-5 times, and dried them in a constant temperature drying oven at 60 degrees C for 12 hours to obtain a CdS/Cu5FeS4/RGO ternary composite photocatalyst.