▎ 摘　　要

NOVELTY - The preparation method of graphene-based bimetallic sulfide nanocomposite photocatalyst involves preparing graphite oxide powder, dispersing in water to prepare graphite oxide solution, and ultrasonically processing to prepare uniformly dispersed graphene oxide suspension, adding tin salt compound and cadmium salt compound, molybdenum salt compound and cadmium salt compound, or nickel salt compound, zinc salt compound and cadmium salt compound to water, dripping graphene oxide solution in mixed metal salt aqueous solution, and ultrasonically dispersing to form mixed solution. USE - Preparation method of graphene-based bimetallic sulfide nanocomposite photocatalyst (claimed). ADVANTAGE - The method enables preparation of graphene-based bimetallic sulfide nanocomposite photocatalyst by simple, economical and industrial process. DETAILED DESCRIPTION - The preparation method of graphene-based bimetallic sulfide nanocomposite photocatalyst involves (1) preparing graphite oxide powder by modified Hummer's method, weighing 0.1-1 g graphite oxide powder, dispersing in water to prepare graphite oxide solution with concentration of 1-10 mgx ml-1, and ultrasonically processing with 100-800 W for 2-8 hours through ultrasonic removing method to prepare uniformly dispersed graphene oxide suspension, (2) adding tin salt compound and cadmium salt compound, molybdenum salt compound and cadmium salt compound, or nickel salt compound, zinc salt compound and cadmium salt compound to 60 ml deionized water according to molar ratio, dripping 1-10 ml graphene oxide solution in the mixed metal salt aqueous solution, and ultrasonically dispersing to form mixed solution (A), adding 0-0.6 mg citric acid monohydrate, 0-0.8 mg anhydrous glucose, 0-1 mg polyvinylpyrrolidone and 0-0.6 mg hexadecyltrimethylammonium bromide to the mixed solution (A) to form mixed solution (B), and magnetically stirring the mixed solution (B) at room temperature for 6 hours, (3) adding 1-8 mmol L-cysteine to the mixed solution (B) obtained in step (2), ultrasonically dissolving to form mixed solution (C), magnetically stirring at room temperature for 1 hour, transferring the mixed solution (C) to 100 ml PTFE-lined stainless steel reactor, hydrothermally reacting at 120-220 degrees C for 1-20 hours, naturally cooling the reaction temperature to room temperature, centrifuging the obtained graphene-based bimetallic sulfide nanocomposite photocatalyst by a centrifuge at speed of 4000 rpm for 5 min, washing the product with water and ethanol several times, and drying the product at 60 degrees C for 24 hours to obtain corresponding graphene-based bimetallic sulfide nanocomposite photocatalyst, (4) ultrasonically dispersing 0.05g graphene-based bimetallic sulfide nanocomposite photocatalyst in 50 ml water, adding 5-20 ml organic acid or organic amine as a hole sacrificial agent, blowing nitrogen for 5 minutes, using 300 W xenon lamp as a light source, filtering the wavelength of less than 420 nm UV light and far UV light using filter, performing the visible light catalytic decomposition of water for hydrogen reaction, and measuring hydrogen generation by gas chromatography.