▎ 摘　　要

NOVELTY - A nitrogen-doped nano zinc sulfide/graphene photocatalytic material is prepared by dispersing graphene oxide in mixed solution of deionized water and ethanol, ultrasonically dispersing to obtain uniformly dispersed graphene oxide dispersion solution, dissolving soluble zinc salt in deionized water, and stirring and dissolving to obtain zinc salt solution; dissolving 2-methylimidazole in deionized water, stirring and dissolving to obtain 2-methylimidazole solution, mixing three solutions, ultrasonically dispersing, magnetically stirring and reacting, centrifuging product, washing with deionized water and ethanol, and drying; and putting into high temperature area of double-temperature area tubular furnace, putting ceramic boat with sulfur powder into low temperature area of double-temperature area tubular furnace, passing nitrogen, controlling temperatures of high and low temperature areas, vulcanizing metal zinc and carbonization decomposing ligand, reacting, and naturally cooling. USE - The method is used for preparing nitrogen-doped nano zinc sulfide/graphene photocatalytic material for degrading organic pollutant including rhodamine B, methyleneblue under visible light (claimed). ADVANTAGE - The material has high dispersion and rhodamine B degradation rate under irradiation of visible light reaching to 97%, and uses traditional hydrothermal composite and subsequent ammonia heat treatment. DETAILED DESCRIPTION - A nitrogen-doped nano zinc sulfide/graphene photocatalytic material is prepared by: (A) dispersing 0.1-1 g graphene oxide in mixed solution of 10-100 ml deionized water and ethanol, ultrasonically dispersing for 10-60 minutes to obtain uniformly dispersed graphene oxide dispersion solution, dissolving soluble zinc salt in deionized water, and stirring and dissolving to obtain 0.1-0.5 mol/L zinc salt solution; (B) dissolving 2-methylimidazole in deionized water, stirring and dissolving to obtain 0.5-2 mol/L 2-methylimidazole solution, mixing three solutions, ultrasonically dispersing for 10-60 minutes, magnetically stirring and reacting under magnetic force at 30-60 degrees C for 4-8 hours, centrifuging product, washing with deionized water and ethanol, and drying to obtain ZIF-8-graphene oxide composite; and (C) putting into high temperature area of double-temperature area tubular furnace, putting ceramic boat with 0.5-3 g sulfur powder into low temperature area of double-temperature area tubular furnace, passing nitrogen as carrier gas and protective gas, controlling temperature of high temperature area at 400-600 degrees C and temperature of low temperature area at 100-200 degrees C, vulcanizing metal zinc and carbonization decomposing ligand, reacting for 1-3 hours, and naturally cooling to room temperature. The molar ratio of zinc salt and 2-methylimidazole in mixed solution is 1:2-4. The mass ratio of zinc sulfide and graphene in material is 1:5-5:1. The sulfur powder is located at upstream position of ZIF-8-oxidized graphene composite. An INDEPENDENT CLAIM is included for application method comprising dispersing 10-100 mg photocatalytic material in 50-500 mL of 0.01-0.1 mM organic pollutant aqueous solution, stirring in dark for 0.5-2 hours, reaching system adsorption balance, using 300 W xenon lamp to obtain visible light source by UV light filter ( greater than or equal to 420 nm), irradiating system, and photocatalytic reacting for 1 hours.