▎ 摘　　要

NOVELTY - Method for preparing nano-cellulose-graphene oxide composite material by (i) adding dimethylformamide solution of toluene diisocyanate to dispersion of dimethylformamide of graphene oxide, stirring the reacting, adding dichloromethane to stop the reaction, washing using dichloromethane, removing the supernatant by centrifugation, and drying under reduced pressure to obtain graphene oxide-isocyanate group, (ii) adding dichlorosulfoxide to dimethylformamide dispersion of nanocellulose in a mass ratio of (33-57):1, washing using dilute aqueous ammonia, removing the supernatant after centrifugation, adjusting the pH to neutral, washing with water, filtering and drying to obtain nanocellulose chloride, (iii) adding ethylenediamine to nanocellulose chloride for reflux, filtering under reduced pressure, freeze-drying to obtain nanocellulose amino group, and (iv) mixing the graphene oxide-isocyanate group and nanocellulose amino group in acetone or acetonitrile and stirring the reaction. USE - The composite material is used in environment and biomedical application. ADVANTAGE - The composite material has excellent adsorptivity, high adsorption and removal efficiency for ions and dye molecules.