▎ 摘　　要

NOVELTY - Preparation of functionalized graphene-based aerogel involves adding chitosan to 1-3 mg/mL graphene oxide dispersion, adjusting pH 6-7, stirring to obtain mixed solution, adding mixed solution to high-pressure reaction kettle for hydrothermal reaction at 165-185 degrees C for 10-15 hours to obtain a wet gel, soaking wet gel 3 times in solvent exchange solution with alcohol and acetone for 24 hours each time, and supercritically drying with carbon dioxide. USE - Preparation of functionalized graphene-based aerogel used for adsorption of heavy metal ions e.g. divalent palladium, divalent copper, divalent cadmium, and divalent nickel (all claimed). ADVANTAGE - The method is simple, suitable for industrialization, carried out using inexpensive and readily available chitosan and graphene oxide as raw material. The graphene-based aerogel enhances the adsorption of heavy metal ions divalent palladium and divalent copper due to attachment of chitosan to the graphene oxide sheet to expose amino group and hydroxyl group to the surface of the aerogel to the greatest extent.