▎ 摘　　要

NOVELTY - The preparation method of bismuth tungstate-molybdenum disulfide/graphene composite material involves (i) dissolving oxidized graphite in deionized water, ultrasonically processing, and dispersing to obtain graphene oxide dispersion, dispersing sodium molybdate and thiourea in deionized water, ultrasonically treating, dispersing, adding into graphene oxide dispersion, stirring to obtain a mixed solution, hydrothermally reacting, naturally cooling, centrifugally separating, washing, and drying to obtain molybdenum disulfide/graphene nanocomposite material. USE - Preparation of bismuth tungstate-molybdenum disulfide/graphene composite material used in treatment of dye-containing wastewater. ADVANTAGE - The environmentally-friendly method enables the preparation of non-toxic bismuth tungstate-molybdenum disulfide/graphene composite material conveniently by simple process at low cost with excellent dye degradation ability under visible light conditions, and photocatalytic efficiency. DETAILED DESCRIPTION - The preparation method of bismuth tungstate-molybdenum disulfide/graphene composite material involves (i) dissolving oxidized graphite in deionized water, ultrasonically processing for 3 hours, dispersing oxidized graphite into graphene oxide to obtain graphene oxide dispersion, dispersing sodium molybdate and thiourea in deionized water in a ratio of 1:5, ultrasonically treating for 15 minutes, uniformly dispersing, adding into graphene oxide dispersion, stirring for 30 minutes to obtain a mixed solution, hydrothermally reacting at 210 degrees C for 24 hours, naturally cooling to room temperature, centrifugally separating, washing the samples with deionized water, washing with ethanol, drying at 80 degrees C for 12 hours to obtain molybdenum disulfide/graphene nanocomposite material, where the ratio of graphene oxide and sodium molybdate is 1:9-45, (ii) dispersing sodium tungstate and bismuth nitrate in deionized water and ethylene glycol in a ratio of 1: 2, ultrasonically processing for 15 minutes, mixing for 2 hours to obtain ethanol/deionized water mixed solution, dissolving molybdenum disulfide/graphene nanocomposite material in ethanol/deionized water mixed solution, ultrasonically treating for 15 minutes, uniformly dispersing, slowly adding to sodium tungstate-and-bismuth nitrate mixed solution, stirring for 2 hours to obtain a mixed solution, hydrothermally reacting at 180 degrees C for 10 hours, naturally cooling to room temperature, centrifugally separating, washing the samples with deionized water, washing with ethanol, and drying at 80 degrees C for 12 hours. The ratio of molybdenum disulfide/graphene nanocomposite material, and sodium tungstate is 1:24-94.