▎ 摘　　要

NOVELTY - A graphene-based heavy metal ion adsorption material comprises 5-9 pts. wt. nitrogen-doped graphene, 30-45 pts. wt. lignosulfonic acid, 10-50 pts. wt. polyvinyl alcohol, 20-35 pts. wt. carboxymethyl chitosan, 5-9 pts. wt. initiator and 12-19 pts. wt. cross-linking agent. USE - Graphene-based heavy metal ion adsorption material (claimed). ADVANTAGE - The graphene-based heavy metal ion adsorption material has excellent adsorption performance. The graphene-based heavy metal ion adsorption material is non-toxic, economical and environmentally-friendly. Energy consumption is reduced. The preparation method is simple and easy to operate. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene-based heavy metal ion adsorption material.