▎ 摘　　要

NOVELTY - Graphene-based multi-stage composite separation material, which is prepared by soaking three-dimensional porous fiber filter material in the graphene oxide dispersion liquid, taking out and drying to obtain graphene oxide-based filter material, placing one end of the graphene oxide-based filter material in an aqueous solution of polyethyleneimine for ultrasonic reaction grafting, cleaning and drying to obtain graphene-based secondary separation material, and placing the other end in reducing atmosphere for heat treating, washing and drying. USE - The material is useful in spearing water-oil emulsion (claimed). ADVANTAGE - The material has high separation efficiency and permeate flux for many types of emulsions, has good separation effect on emulsions stabilized by surfactants, anionic surfactants, cationic surfactants, nonionic surfactants and mixed surfactants, and is suitable for the treatment of all oil-in-water emulsions. The separation material is biological affinity, environmentally friendly, easy to clean, reusable, and has good stability. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of method for preparing graphene-based multi-stage composite separation material (Drawing includes non-English language text).