▎ 摘　　要

NOVELTY - Improving purity of graphene, involves mixing metal catalyst, metal capture agent, carbon material, dextran, vinyl acetate-maleic anhydride copolymer, starch-acrylonitrile graft copolymer, cellulose grafted acrylonitrile hydrolysate and stirring to obtain carbon source mixture absorbed with the metal catalyst. The weight ratio of metal catalyst, metal capture agent, carbon material, dextran, vinyl acetate-maleic anhydride copolymer, starch-acrylonitrile graft copolymer, cellulose grafted acrylonitrile hydrolysate 1:(0.4-0.6):(0.8-1.2):(0.1-0.3):(0.5-0.7):(0.1-0.3):(0.3-0.5). USE - Method for improving purity of graphene (claimed). ADVANTAGE - The method enables to improve purity of graphene in a simple and eco-friendly manner with high purity, and high yield product. DETAILED DESCRIPTION - Improving purity of graphene, involves mixing metal catalyst, metal capture agent, carbon material, dextran, vinyl acetate-maleic anhydride copolymer, starch-acrylonitrile graft copolymer, cellulose grafted acrylonitrile hydrolysate and stirring to obtain carbon source mixture absorbed with the metal catalyst. The weight ratio of metal catalyst, metal capture agent, carbon material, dextran, vinyl acetate-maleic anhydride copolymer, starch-acrylonitrile graft copolymer, cellulose grafted acrylonitrile hydrolysate 1:(0.4-0.6):(0.8-1.2):(0.1-0.3):(0.5-0.7):(0.1-0.3):(0.3-0.5). The reducing agent is dissolved with the carbon source catalyst-adsorbed carbon source mixture. The mixture is heated to a temperature of 12-14 degrees C/minute according to a heating rate for 950-1050 degrees C for 26-28hours to obtain graphene initial product. The reducing agent is nano-zinc powder. The initial product is ground to a particle size of 10000 mesh. The steel needle grinding body is placed in a closed grinding container. The grinding container is placed in the space with a cylindrical transformation magnetic field formed oppositely and peeled off for 48-58 hours, to obtain mixture of graphite nanometer-graphene-graphene dry powder. The material is allowed to settled and centrifuged to obtain a high purity graphene transparent suspension.