▎ 摘　　要

NOVELTY - A graphene oxide composite hydrogel is made of graphene oxide, polyethylene glycol-containing hyperbranched polyester copolymer and poly(trans-4-carbonyl-4-(thiophene-2-yl)but-2-enoic acid) in a weight ratio of 1:0.5-0.8:0.2-0.5. USE - Graphene oxide composite hydrogel used for adsorbing heavy metals (claimed). ADVANTAGE - The composite hydrogel has excellent heavy metal adsorption performance, and ensures improved mechanical property of the graphene oxide due to introduction of polyethylene glycol-containing hyperbranched polyester copolymer and poly(trans-4-carbonyl-4-(thiophene-2-yl)but-2-enoic acid) into the molecular structure of graphene oxide. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the hydrogel, which involves (S1) dissolving graphene oxide and polyethylene glycol-containing hyperbranched polyester copolymer in a solvent (B), adding diisocyanate and catalyst, heating and stirring to obtain a copolymer, and (S2) adding diisocyanate and poly(trans-4-carbonyl-4-(thiophene-2-yl)but-2-enoic acid) to the copolymer, heat-reacting, soaking the product in deionized water, and freeze-drying.