▎ 摘　　要

NOVELTY - A composite material contains 5-30 wt.% graphene, 30-60 wt.% titanium dioxide and 30-60 wt.% zinc-graphitic carbon nitride. USE - The composite material is useful for removing hexavalent chromium from wastewater (claimed). ADVANTAGE - The composite material has excellent photocatalytic performance, improves the chromium reduction ability of wastewater, and shortens the reaction time. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of composite material, which involves dissolving cyanide and zinc acetate in water, stirring, drying, calcining and then naturally cooling to obtain zinc-graphitic carbon nitride, ultrasonically dispersing zinc-graphitic carbon nitride in water to form uniform suspension, dripping tetrabutyl titanate in the suspension and fully stirring, transferring mixed solution to PTFE lined stainless steel reaction kettle and performing solvothermal reaction, washing the solvothermal reaction product with solvent, ethanol and deionized water and drying in a vacuum drying box.