▎ 摘　　要

NOVELTY - Preparing graphene composite material involves washing sponge three times with ethanol and distilled water, and drying to constant weight. The dopamine is added to Tris buffer to prepare a dopamine solution with a concentration of 0.2-1 wt.%. The sponge dried to constant weight is immersed in dopamine solution at room temperature, soaked for 12-24 hours at constant temperature, and distilled water is taken out for sponge, rinsed and dried to constant weight. The graphene oxide is added to deionized water for ultrasonic treatment for 2-3 hours to obtain an aqueous solution of graphene oxide. The dried sponge is immersed in an aqueous solution of graphene oxide, and then hydrazine hydrate is added, reacted at 50-70 degrees C for 3-5 hours, taken out the drying to constant weight. The gamma methacryloxypropyltrimethoxysilane is added to the solvent to prepare a solution having a volume fraction of 2-5%, and the dried sponge is immersed in the solution to be fully impregnated for 3-5 hours. USE - Method for preparing graphene composite material for water treatment. ADVANTAGE - The method enables to prepare graphene composite material which has strong adsorption capacity and good separation effect of oil and water, and widely used in water treatment field. DETAILED DESCRIPTION - The distilled water is taken and dried to constant weight to obtain graphene composite material.