▎ 摘　　要

NOVELTY - Method for preparing a highly active tungsten disulphide/graphene (WS2/RGO) composite photocatalyst, involves dissolving the tungsten disulphide (WS2) powder in a mixed solution of ethanol and water, sonicating for 4-12 hours, and then centrifuge for 10-60 minutes to remove the unpeeled sediment to obtain a single-layer or small-layer WS2 nanosheet suspension with a concentration of 5-20 mg/mL. Graphene oxide is prepared by using the improved Hummers method with graphite powder as a raw material where a certain amount of graphene oxide is weighed and dissolved in deionized water under ultrasonic conditions to obtain a graphene oxide aqueous solution, WS2 nanosheet suspension obtained is added to the graphene oxide aqueous solution to obtain a mixed solution. 0.4-0.8 pts. wt. ammonium molybdate (H32Mo7N6O28) and 4-5 pts. wt. thiourea (CN2H4S) are weighed and added them to the mixed solution obtained under magnetic stirring. USE - WS2/MoS2-RGO composite photocatalyst is used in photocatalytic degradation of dye wastewater under sunlight (claimed). ADVANTAGE - The method for preparing a highly active WS2/MoS2-RGO composite photocatalyst has strong visible light absorption performance, adsorption performance for dye molecules, and large specific surface area, and thus has high performance for degrading rhodamine B dye wastewater under sunlight, and has high cycling performance and stability. DETAILED DESCRIPTION - Method for preparing a highly active tungsten disulphide/graphene (WS2/RGO) composite photocatalyst, involves dissolving the tungsten disulphide (WS2) powder in a mixed solution of ethanol and water, sonicating for 4-12 hours, and then centrifuge for 10-60 minutes to remove the unpeeled sediment to obtain a single-layer or small-layer WS2 nanosheet suspension with a concentration of 5-20 mg/mL. Graphene oxide is prepared by using the improved Hummers method with graphite powder as a raw material where a certain amount of graphene oxide is weighed and dissolved in deionized water under ultrasonic conditions to obtain a graphene oxide aqueous solution, WS2 nanosheet suspension obtained is added to the graphene oxide aqueous solution to obtain a mixed solution. 0.4-0.8 pts. wt. ammonium molybdate (H32Mo7N6O28) and 4-5 pts. wt. thiourea (CN2H4S) are weighed and added them to the mixed solution obtained under magnetic stirring. Then transferred it to an ultrasonic cleaner to ensure it is fully mixed and dissolved. The mixed solution obtained is transferred to a polytetrafluoroethylene reaction kettle for heating, and then the reaction kettle is cooled to room temperature, and the precipitate is obtained by suction filtration, washed with ethanol and deionized water, and then placded in the WS2/MoS2-RGO composite photocatalyst which is dried in a constant temperature drying box to constant weight.