▎ 摘　　要

NOVELTY - Graphene oxide/chitooligosaccharide composite crosslinked gel is claimed. The gel is prepared by dissolving chitosan in water, adding epichlorohydrin, stirring at constant temperature, and extracting with organic solvent after the reaction to obtain solution 1, dispersing graphene oxide in water, dropping the obtained dispersion into the bis-primary amine, then adding condensing agent, and stirring the mixture at a constant temperature to obtain solution 2, and mixing solution 1 and solution 2 evenly by stirring at constant temperature. USE - Used as graphene oxide/chitooligosaccharide composite crosslinked gel. ADVANTAGE - The crosslinked gel has enlarged specific surface area, mild reaction conditions, simple preparation process, and superior performance in terms of heavy metal ion adsorption.