▎ 摘　　要

NOVELTY - A composite photocatalyst comprises catalytic nanoparticles comprising tungsten oxide and graphene, and co-catalyst nanoparticles comprising a transition metal boride and a transition metal hydroxide arranged upon the catalytic nanoparticles. USE - Composite photocatalyst used in degradation of organic pollutant in aqueous solution, and production of hydrogen gas from water (all claimed). ADVANTAGE - The composite catalyst provides hydrogen gas at a rate of 250-750 mmol/hour/g. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the composite photocatalyst, which involves dispersing the catalytic nanoparticles in a precursor solution (S1) comprising a transition metal halide (A1), adding a reducing agent solution comprising a borohydride reducing agent and a hydroxide base to the precursor solution (S1) and stirring to form a boride-containing product, dispersing the boride-containing product in a precursor solution (S2) comprising a transition metal halide (A2), a hypophosphite salt, and an aminoalcohol to form a photoreaction mixture, irradiating the photoreaction mixture with UV and visible light for 5-60 minutes to form the composite photocatalyst, and collecting the composite photocatalyst; (2) degradation of an organic pollutant, which involves contacting a solution comprising the organic pollutant with the composite photocatalyst of claim 1 to form a catalytic mixture, and irradiating the catalytic mixture with visible light for 1-180 minutes; and (3) production of hydrogen gas, which involves exposing a mixture comprising the composite photocatalyst and water to visible light, and collecting hydrogen gas.