▎ 摘　　要

NOVELTY - Preparing cellulose-based amphoteric oxide graphene composite material, involves putting cellulose in sodium hydroxide solution with mass fraction of 20 wt.% in the bath ratio of 1:50, at 90 degrees C to react for 120 minutes. The material is washed with de-ionized water repeatedly until neutral, and dried to obtain sodium hydroxide modified cellulose. The sodium hydroxide modified cellulose is dispersed in de-ionized water, where the bath ratio is 1:50. The trimethyl allyl ammonium chloride is added. USE - Method for preparing cellulose-based amphoteric oxide graphene composite material (claimed). ADVANTAGE - The method enables to prepare cellulose-based amphoteric oxide graphene composite material that is eco-friendly and degradable, has good mechanical performance, regular tissue structure and high porosity. The cellulose-based amphoteric oxide graphene composite material is applied in sewage treatment field. DETAILED DESCRIPTION - Preparing cellulose-based amphoteric oxide graphene composite material, involves putting cellulose in sodium hydroxide solution with mass fraction of 20 wt.% in the bath ratio of 1:50, at 90 degrees C to react for 120 minutes. The material is washed with de-ionized water repeatedly until neutral, and dried to obtain sodium hydroxide modified cellulose. The sodium hydroxide modified cellulose is dispersed in de-ionized water, where the bath ratio is 1:50. The trimethyl allyl ammonium chloride is added, where the mass ratio of the trimethyl allyl ammonium chloride and sodium hydroxide modified cellulose is 1:5-1:10, and reacted at 60-80 degrees C for 1-24hours. The material is repeatedly washed by the deionized water and dried to obtain the trimethyl allyl ammonium chloride modified cellulose. The trimethyl allyl ammonium chloride modified cellulose is dispersed in de-ionized water, where the bath ratio is 1:50. 1-100g/l of polyamide-amine aqueous solution is slowly added with the mass ratio of 1: 5-1:10, and reacted at 75-95 degrees C for 60-120 minutes. The obtained material is washed and dried to obtain the cationized cellulose. The cationized cellulose is dispersed in de-ionized water, and evocating agent ammonium ceric nitrate is added with the mass ratio of 1:10-1:30, and reacted for 120 minutes in nitrogen protection. The dioctyl ester sodium sulfonate is added and the temperature is raised to 80-90 degrees C and magnetically stirred for 1-12hours, and naturally cooled to room temperature, washed by deionized water and ethanol, filtered, and dried to obtain the cellulose. The konjaku flour is dispersed in de-ionized water at normal temperature, the bath ratio is 1:50. The glutaraldehyde is added, where the volume ratio of glutaraldehyde and konjak powder aqueous solution is 1:10. 1-100g/l of terminal hydroxyl hyperbranched polymer aqueous solution is added and reacted for 24hours, washed by deionized water and ethanol, filtered and dried to obtain the hydroxylterminated hyper-branched polymer modified konjak. 20-80 pts. wt. of amphoteric cellulose and 20-50 pts. wt. of terminal hydroxyl hyperbranched polymer modified konjak and 1-20 pts. wt. of oxidized graphene are dispersed in the deionized water and ultrasonicated for 1hour and and then reacted for 1-24hours, washed with de-ionized water repeatedly, filtered, and dried to obtain the graphene oxide-based amphoteric cellulose composite.