▎ 摘　　要

NOVELTY - The method involves preparing an 80 mL sulfuric acid solution and ultrasonic. The 80 mL polyethyleneimine solution is prepared for magnetically stirring for 1 hour. The 80 mL sulfonate solution and 80 mL PEI water solution are fully mixed for and ultrasonically stirring to obtain a mixed solution. The bottom film is fixed in the ultrafiltration cup, for pressing 100-100 MPa ultra-pure water at 1 bar for pre-pressing and stabilizing. The mixed solution is poured into the ultra-filtration container containing the bottom membrane for pressurizing and filtering. The PEI solution and sulfonic acid solution are transferred to the film of the PES ultra-filament bottom membrane and are placed in the oven to blow and dry to obtain the sulfonation graphene nanophiltration membrane. USE - Layer-by-layer self-assembly preparation method of sulfonated graphene nano-filtration membrane (claimed). ADVANTAGE - The method provides sulfonated graphene nano-filtration membrane with high interception rate of monovalent inorganic salt, wide application range, and more excellent film performance. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram showing the influence of water contact angle on the surface of SG/PEI self-assembled nanofiltration membrane under different SG concentrations. 70Vertex 80Polyethylene imine water solution