▎ 摘　　要

NOVELTY - Preparing superhydrophilic highly elastic graphene airgel involves adding chitosan quaternary ammonium salt aqueous solution and ethylenediamine to the graphene oxide dispersion in sequence, stirring and ultrasonicating uniformly at room temperature to obtain a modified graphene oxide dispersion. The concentration of graphene oxide dispersion is 3-5 mg/ml. The mass ratio of chitosan quaternary ammonium salt to graphene oxide is 1-4:20. The volume ratio of ethylenediamine to graphene oxide dispersion is 1-2:250. The modified graphene oxide dispersion liquid is transferred into a hydrothermal reaction kettle and hydrothermal reaction is conducted at a temperature of 90-150°C for 9-15 hours to obtain a reduced graphene oxide hydrogel. The reduced graphene oxide hydrogel is dialyzed with a hydroalcoholic solution, placed into a refrigerator for pre-freezing, and vacuum freeze-dried to obtain a super-hydrophilic and highly elastic graphene airgel. USE - Method for preparing superhydrophilic highly elastic graphene airgel used for removing heavy metals in waste water (claimed). ADVANTAGE - The super-hydrophilic and highly elastic graphene airgel has good elasticity and good hydrophilicity, and the minimum contact angle can reach 0°. The test on the adsorption performance of hexavalent chromium shows that the super-hydrophilic and highly elastic graphene airgel has a good adsorption effect, beneficial to separation after adsorption, and has a good application prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a super-hydrophilic highly elastic graphene airgel.