▎ 摘　　要

NOVELTY - Manufacturing photocatalyst composite, comprises (a) producing titanium dioxide supported reduced graphene oxide by contacting reduced graphene oxide with titanium dioxide; (b) producing titanium dioxide supported phosphoric acid group with reduced graphene oxide by modifying titanium dioxide supported reduced graphene oxide with phosphate; and (c) manufacturing photocatalyst composite comprising titanium dioxide supported reduced graphene oxide with cobalt phosphate by introducing cobalt precursor on the surface of the titanium dioxide supported reduced graphene oxide with phosphate groups. USE - The method is useful for manufacturing photocatalyst composite for producing hydrogen peroxide (all claimed). ADVANTAGE - The method has excellent production efficiency of photocatalyst composite and hydrogen peroxide by replacing noble metals and preventing decomposition of hydrogen peroxide with phosphate groups on the surface of titanium dioxide, and has low process costs. DETAILED DESCRIPTION - Manufacturing photocatalyst composite, comprises (a) producing titanium dioxide supported reduced graphene oxide on a surface by contacting reduced graphene oxide with titanium dioxide; (b) producing titanium dioxide supported phosphoric acid group with reduced graphene oxide by modifying the surface of titanium dioxide supported reduced graphene oxide on a surface with phosphate; and (c) manufacturing photocatalyst composite comprising titanium dioxide supported reduced graphene oxide with cobalt phosphate on a surface by introducing cobalt precursor on the surface of the titanium dioxide supported reduced graphene oxide with phosphate groups. The step (c) is carried out at a pH of 2-4. An INDEPENDENT CLAIM is also included for producing hydrogen peroxide, comprising steps (a), (b), (c), and (d) preparing hydrogen peroxide by reacting water using photocatalyst composite as a catalyst under light irradiation.