▎ 摘　　要

NOVELTY - Method for the preparation of graphene-coated amphoteric cellulose composite material involves dispersing amphoteric cellulose, silk fibroin, carbon nanotubes and pore-forming agents into deionized water, carrying out ultrasonic treatment, reacting, pouring the reactants into a mold, putting into liquid nitrogen, taking out, pre-freezing, again freezing in thermo-ultralow temperature refrigerator, freeze-drying to obtain amphoteric cellulose-based porous composite material, and soaking amphoteric cellulose-based porous composite material in graphene oxide solution. USE - Method is useful for the preparation of graphene-coated amphoteric cellulose composite material, which is useful for sewage treatment and photoelectric device applications. ADVANTAGE - The method ensures simple, environmentally-friendly and economical preparation of graphene-coated amphoteric cellulose composite material with excellent mechanical property and high porosity. DETAILED DESCRIPTION - Method for the preparation of graphene-coated amphoteric cellulose composite material involves soaking cellulose in 20 %mass sodium hydroxide solution in a bath ratio of 1:50, reacting at 90 degrees C for 120 minutes, repeatedly washing with deionized water until the mixture is neutral, drying to obtain sodium hydroxide modified cellulose, re-dispersing sodium hydroxide modified cellulose into deionized water in a bath ratio of 1:50, adding allyltrimethylammonium chloride, where the mass ratio of allyltrimethylammonium chloride to sodium hydroxide modified cellulose is 1:5-1:10, reacting at 60-80 degrees C for 1-24 hours, repeatedly washing with deionized water, drying to obtain allyltrimethylammonium chloride modified cellulose, re-dispersing allyltrimethylammonium chloride modified cellulose into deionized water in a bath ratio of 1:50, slowly adding 1-100 g/l polyamidoamine aqueous solution, where the volume ratio of polyamidoamine aqueous solution to allyltrimethylammonium chloride modified cellulose is 1:5-1:10, reacting at 75-95 degrees C for 60-120 minutes, taking out, washing, drying to obtain a cationic cellulose, re-dispersing the cationic cellulose into deionized water in a bath ratio is 1:50, adding cerium ammonium nitrate as initiator, where the mass ratio of cerium ammonium nitrate and cationic cellulose is 1:10-1:30, continuously introducing nitrogen for protection, mixing and stirring for 120 minutes, slowly adding dioctyl sodium sulfosuccinate, uniformly mixing and stirring, slowly heating at 80-90 degrees C, magnetically stirring for 1-12 hours, naturally cooling to room temperature, washing, carrying out suction filtration, drying to obtain amphoteric cellulose, dispersing 80-95 pts. wt. amphoteric cellulose, 1-10 pts. wt. silk fibroin, 1-10 pts. wt. carbon nanotubes and 1-5 pts. wt. pore-forming agents into deionized water in a bath ratio of 1:50, carrying out ultrasonic treatment for 1 hour, stirring, reacting at 50-70 degrees C for 1-24 hours, pouring the reactants into a mold, putting into liquid nitrogen for 1 minute, taking out, pre-freezing at -20 degrees C for 6 hours, again freezing in thermo-ultralow temperature refrigerator at 80 degrees C for 6 hours, freeze-drying for 48 hours to obtain amphoteric cellulose-based porous composite material, preparing 0.1-100 g/l graphene oxide aqueous solution, carrying out ultrasonic treatment for 1 hour, soaking amphoteric cellulose-based porous composite material in graphene oxide solution for 60-600 minutes in a bath ratio of 1:50, repeatedly washing with ethanol and deionized water, carrying out suction filtration, drying, carrying out reduction using reducing agent, washing, suction filtering and vacuum drying to obtain the graphene-coated amphoteric cellulose composite material. An INDEPENDENT CLAIM is included for the graphene-coated amphoteric cellulose composite material prepared by the above method.