▎ 摘　　要

NOVELTY - Preparing carboxymethyl chitosan/graphene oxide composite hydrogel comprises adding carboxymethyl chitosan aqueous solution and graphene oxide aqueous solution and stirring uniformly to obtain carboxymethyl chitosan and graphene oxide dispersion liquid, then adding 4,4'-dimethyltriphenylmethane-2,2',5,5'-tetraisocyanate by stirring, ultrasonically defoaming, reacting at room temperature for certain time, extruding and filtering to obtain final product, where concentration of carboxymethyl chitosan aqueous solution is 10 wt.%. USE - The composite hydrogel is useful as electroplating industrial waste absorbent to remove heavy metal ions in electroplating industrial wastewater (claimed). ADVANTAGE - The method: is simple, easy to operate and suitable for industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for carboxymethyl chitosan/graphene oxide composite hydrogel is prepared by above mentioned method.