▎ 摘　　要

NOVELTY - Preparing graphene-based photo catalytic composite material comprises dispersing porous graphene and zeolite in absolute ethanol to obtain graphene-coated porous zeolite, sintering to obtain a graphene-coated porous zeolite material, adding e.g. sodium molybdate dehydrate to absolute ethanol/deionized aqueous solution, stirring, ultrasonically processing to obtain mixture A, dissolving selenium powder in e.g. hydrazine hydrate, stirring to obtain solution I, adding solution I to mixture A to obtain mixture B, transferring to a reactor lined with polytetrafluoroethylene, subjecting to a hydrothermal reaction, cooling, drying to obtain molybdenum diselenide nanosheet/graphene coated porous zeolite composite and adding the metal phthalocyanine to absolute ethanol, stirring to obtain a metal phthalocyanine solution, immersing the molybdenum diselenide nanosheet/graphene-coated porous zeolite composite, evaporating, drying to obtain the reaction product and recycling to obtain product. USE - The catalytic composite material is useful for degrading methylene blue (claimed). ADVANTAGE - The method ensures that the photo catalytic material degrades methylene blue for a long time; has high degradation effect and agglomeration of graphene in graphene-based photo catalytic composites and has rich photo catalytic effect. DETAILED DESCRIPTION - Preparing graphene-based photo catalytic composite material comprises (a) dispersing porous graphene and zeolite in absolute ethanol, removing the absolute ethanol under heating and stirring conditions to obtain graphene-coated porous zeolite, sintering the graphene-coated porous zeolite under an inert atmosphere to obtain a graphene-coated porous zeolite material, where the particle size of the zeolite is 70-80 mesh and the porous graphene has a specific surface area of 1000-1300 m2/g and a pore diameter of 3-5 nm,(b) adding sodium molybdate dehydrate to the absolute ethanol/deionized aqueous solution, adding the graphene-coated porous zeolite material, magnetically stirring, ultrasonically processing to obtain mixture A, (b1) dissolving selenium powder in hydrazine hydrate and deionized water, stirring to obtain solution I, (b2) adding solution I to the mixture A to obtain the mixture B, transferring the mixture B to a reactor lined with polytetrafluoroethylene, subjecting to a hydrothermal reaction, cooling, drying to obtain the molybdenum diselenide nanosheet/graphene coated porous zeolite composite and (c) adding the metal phthalocyanine to absolute ethanol, stirring evenly to obtain a metal phthalocyanine solution, (c1) immersing the molybdenum diselenide nanosheet/graphene-coated porous zeolite composite into the metal phthalocyanine solution, evaporating the solvent to dryness under stirring and heating, drying to obtain the reaction product and (c2) recycling to obtain the graphene-based photo catalytic composite material. An INDEPENDENT CLAIM is also included for use method of the graphene-based photo catalytic composite material for completed degrading methylene blue comprising adding the graphene-based photo catalytic composite material to wastewater with 10-20 mg/l methylene blue, adjusting the pH of the wastewater to 6.5-7.5, using a high-pressure mercury lamp as the ultraviolet light source and irradiating under stirring conditions and power of 300W for 10-15 minutes to obtain water with methylene blue removed, where the ratio of the graphene-based photo catalytic composite material to the waste water is (1-2 g): 100 ml.