▎ 摘　　要

NOVELTY - A three-dimensional graphene oxide/polyethylene imine/carboxymethyl cellulose composite material is prepared by taking graphene oxide and water, ultrasonicating to obtain graphene oxide dispersion, adjusting pH value to 8.0 plus minus 0.5, adding polyethylene imine according to mass ratio of 1:1-3, ultrasonicating, obtaining graphene oxide/polyethylene imine compound liquid, adding sodium carboxymethyl cellulose solution according to mass ratio of 1:1-3:0.5-1, stirring and mixing at rate of 800-1000 revolutions/minute (rpm), adding glutaraldehyde, reacting at rate of 500-600 rpm, and washing and drying. USE - Method for preparing three-dimensional graphene oxide/polyethylene imine/carboxymethyl cellulose composite material for heavy metal ion adsorption (claimed). ADVANTAGE - The product has good adsorption effect to lead (II) ion with adsorption increased by 34.6%. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for application of three-dimensional graphene oxide/polyethylene imine/carboxymethyl cellulose composite material comprising adjusting pH value of heavy metal ion-containing wastewater to 2-7, adding three-dimensional graphene oxide/polyethylene imine/cellulose composite material, and absorbing.