▎ 摘　　要

NOVELTY - Preparing a ferroferric oxide-graphene-cellulose conductive composite aerogel involves: (1) adding sodium hydroxide and urea to water, mixing to obtain a mixed aqueous solution of sodium hydroxide/urea, and dispersing graphene oxide in water to obtain an aqueous solution of graphene oxide; (2) pre-cooling the aqueous solution of sodium hydroxide/urea, then adding cellulose and stirring to obtain a cellulose solution, adding the graphene oxide aqueous solution to the cellulose solution and mixing to obtain a mixed solution, then casting into a film and subjecting to a coagulation bath treatment to obtain a hydrogel; (3) immersing the hydrogel in a reducing agent solution for reduction to obtain a graphene-cellulose composite hydrogel; and (4) sequentially immersing the graphene-cellulose composite hydrogel in a mixed aqueous solution of ferric chloride and ferrous chloride and an alkaline solution to obtain a ferroferric oxide-graphene-cellulose composite hydrogel. USE - The method is useful for preparing a ferroferric oxide-graphene-cellulose conductive composite aerogel, which is useful in an electromagnetic shielding. ADVANTAGE - The method enables simple preparation of the ferroferric oxide-graphene-cellulose conductive composite aerogel with excellent electromagnetic shielding effect and without causing pollution to the environment. DETAILED DESCRIPTION - Preparing a ferroferric oxide-graphene-cellulose conductive composite aerogel involves: (1) adding sodium hydroxide and urea to water, uniformly mixing to obtain a mixed aqueous solution of sodium hydroxide/urea, and dispersing graphene oxide in water to obtain an aqueous solution of graphene oxide; (2) pre-cooling the mixed aqueous solution of sodium hydroxide/urea obtained in the step (1), then adding cellulose and uniformly stirring to obtain a cellulose solution, adding the aqueous solution of the graphene oxide obtained in the step (1) to the cellulose solution and uniformly mixing to obtain a mixed solution, and casting the mixed solution into a film, then subjecting to a coagulation bath treatment in a dilute sulfuric acid solution to obtain a hydrogel and washing; (3) immersing the hydrogel washed in the step (2) in a reducing agent solution for reduction treatment to obtain a graphene-cellulose composite hydrogel and washing; and (4) adding ferric chloride and ferrous chloride to water, uniformly mixing to obtain a mixed aqueous solution of ferric chloride and ferrous chloride, sequentially immersing the graphene-cellulose composite hydrogel washed in the step (3) in the mixed aqueous solution of ferric chloride and ferrous chloride and an alkaline solution to obtain a ferroferric oxide-graphene-cellulose composite hydrogel, washing, and freeze-drying. An INDEPENDENT CLAIM is included for the ferroferric oxide-graphene-cellulose conductive composite aerogel prepared by the above method.