▎ 摘　　要

NOVELTY - A tungsten disulfide/graphene quantum dots/titanium dioxide composite photocatalyst comprises tungsten disulfide, graphene quantum dots, and titanium dioxide. The composite photocatalyst is prepared by supporting graphene quantum dots and tungsten disulfide on the surface of the titanium dioxide, and has a structure of titanium-oxygen-carbon. The titanium-oxygen-carbon structure is capable of imparting electrons excited by the graphene quantum dots under visible light to the titanium dioxide. USE - Tungsten disulfide/graphene quantum dots/titanium dioxide composite photocatalyst. ADVANTAGE - The preparation method of tungsten disulfide/graphene quantum dots/titanium dioxide composite photocatalyst is simple, environmentally-friendly, low in energy consumption and suitable for industrial production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the tungsten disulfide/graphene quantum dots/titanium dioxide composite photocatalyst, which involves (1) mixing titanium dioxide, graphene quantum dots and tungsten disulfide with anhydrous ethanol to obtain mixed liquids (A)-(C), (2) ultrasonically treating the mixed liquid (C), so that the tungsten disulfide in the mixed liquid (C) is stripped into a small layer structure or a single layer structure, (3) mixing the mixed liquids (A) and (B) and the ultrasonically treated mixed liquid (C), stirring and reacting to obtain a mixed liquid (I), (4) heating the mixed liquid (I) at 60-90 degrees C and heat preserving until the solvent is evaporated to dryness to obtain a precursor, and (5) baking the precursor in an inert gas; and (2) method of using the composite photocatalyst, which involves (a) adding the tungsten disulfide/graphene quantum dots/titanium dioxide composite photocatalyst to a methylene blue solution under the absence of light, and performing physical adsorption until the composite photocatalyst is saturated with the methylene blue solution, and (b) using a 300 W xenon lamp to simulate sunlight and irradiating the methylene blue solution containing the composite photocatalyst to determine the concentration of the methylene blue solution at different times, and calculating the visible light catalytic activity of the composite photocatalyst according to the concentration of the methylene blue solution at different times.