▎ 摘　　要

NOVELTY - Preparing carboxymethyl chitosan/oxidized graphene composite hydrogel comprises taking oxidized graphene aqueous solution, adding into carboxymethyl chitosan aqueous solution, uniformly stirring to obtain carboxymethyl chitosan and oxidized graphene dispersion liquid, adding in drop wise manner 4,4'-dimethyldiphenyl-methane-2,2',5,5'-tetra-isocyanate under stirring condition, ultrasonically de-foaming, reacting at room temperature, carrying out extrusion filtering to obtain carboxymethyl chitosan/oxidation graphene composite hydro-gel. USE - The hydro-gel is useful as electroplating industrial wastewater adsorbent for removing heavy metal ions in electroplating industrial wastewater (claimed). ADVANTAGE - The method: is easy to operate and suitable for industrial production. The hydro-gel: is capable of adsorbing heavy metal ions in electroplating wastewater; reduce the content of heavy metal ions in the wastewater; and can be easily separated from the system after the completion of adsorption. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for carboxymethyl chitosan/oxidized graphene composite hydrogel prepared according to the above mentioned method.