▎ 摘　　要

NOVELTY - Preparing nickel selenide/tungsten trioxide/graphene photocatalytic composite material comprises dispersing tungstic acid and graphene-coated porous zeolite material into absolute ethanol, removing the absolute ethanol under heating and stirring conditions, putting into a muffle furnace at 480-500degrees Celsius for 1-2 hours, and cooling to room temperature naturally to obtain tungsten trioxide/graphene composite. Selenium powder and sodium borohydride are added into N,N-dimethylformamide under stirring and reacting, and then mixed with nickel (II) chloride hexahydrate under stirring to obtain a mixed solution. The tungsten trioxide/graphene composite is immersed into the mixed solution, then evaporated the solvent to dryness under stirring and heating conditions. The formed product is naturally cooled at room temperature to obtain the nickel selenide/tungsten trioxide/graphene photocatalytic composite material. USE - Method for preparing nickel selenide/tungsten trioxide/graphene photocatalytic composite material used for degrading rhodamine B. ADVANTAGE - The method can completely degrade rhodamine B within 35 minutes, where the degradation rate of rhodamine B can still reach 81% after the fifth use. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for using nickel selenide/tungsten trioxide/graphene photocatalytic composite material, which involves adding nickel selenide/tungsten trioxide/graphene photocatalytic composite material to wastewater containing rhodamine B, and irradiating under stirring condition by using a high-pressure mercury lamp as an ultraviolet light source to obtain wastewater without the rhodamine B.