▎ 摘　　要

NOVELTY - A graphene-based nano-metal composite material comprises graphene having three-dimensional porous foam structure matrix having pore size of 50-500 mu m, in which nano-metal particles having particle size of 2-200 nm are supported on matrix. The nano-metal particles are chosen from iron, iron-nickel or palladium binary alloy. USE - Graphene-based nano-metal composite material is used for degrading organic waste e.g. dye orange-4-containing wastewater (all claimed) and sewage treatment. ADVANTAGE - The graphene-based nano-metal composite material has excellent dispersibility, uniformity and stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene-based nano-metal composite material, which involves performing plasma treatment of graphene, adding soluble ferrous salt solution or soluble nickel or palladium-containing soluble salt, mixing and adding reducing agent.