▎ 摘　　要

NOVELTY - The preparation method of cadmium sulfide quantum dot/bismuth molybdate/graphene composite photocatalyst involves: (1) dissolving bismuth nitrate pentahydrate and sodium molybdate dihydrate in deionized water to form mixed solution of bismuth nitrate and sodium molybdate, then stirring and transferring to hydrothermal reactor, putting the hydrothermal reactor into microwave digestion instrument, carrying out microwave reaction at a temperature of 120 degrees C for 5-30 minutes, cooling after the reaction is completed, washing and drying to obtain bismuth molybdate nanopowder. USE - The method is useful for preparing cadmium sulfide quantum dot/bismuth molybdate/graphene composite photocatalyst (claimed). ADVANTAGE - The method prepares cadmium sulfide quantum dot/bismuth molybdate/graphene composite photocatalyst under mild operation condition with high photocatalytic activity in an environmentally-friendly manner. DETAILED DESCRIPTION - The preparation method of cadmium sulfide quantum dot/bismuth molybdate/graphene composite photocatalyst involves: (1) dissolving bismuth nitrate pentahydrate and sodium molybdate dihydrate in molar ratio of 2:1 in deionized water to form mixed solution of bismuth nitrate and sodium molybdate, stirring the bismuth nitrate and sodium molybdate mixed solution at room temperature for 2 hours, then transferring to hydrothermal reactor, putting the hydrothermal reactor into microwave digestion instrument, carrying out microwave reaction at a temperature of 120 degrees C for 5-30 minutes, cooling after the reaction is completed, washing and drying to obtain bismuth molybdate nanopowder; (2) preparing solution of cadmium acetate, adding thioglycolic acid and sodium sulfide to solution of cadmium acetate under stirring and passing nitrogen to obtain mixed solution, where the molar ratio of thioglycolic acid and cadmium acetate is 1.2:1, and the molar ratio of sodium sulfide and cadmium acetate is 1:1; (3) reacting the mixed solution obtained in step (2) at 65 degrees C for 2 hours, and then adding graphene and bismuth molybdate nanopowder obtained in step (1) to obtain suspension solution, where the mass ratio of graphene to bismuth molybdate nanopowder is (0.03-0.15):1, and the molar ratio of bismuth molybdate nanopowder and cadmium acetate is (0.1-0.5):1; and (4) further reacting suspension solution obtained in step (3) for 0.5 hour, filtering and drying to obtain product.