▎ 摘　　要

NOVELTY - Production of negatively charged modified nanofiltration membrane involves dissolving polyethersulfone in an organic solvent at 50℃, adding additive, stirring, filtering, defoaming to obtain a casting solution, casting the casting solution on a polyester nonwoven fabric, scraping formed film with a scraper, soaking in deionized water, drying to obtain a base membrane, uniformly dispersing negatively charged component, modified graphene oxide and deionized water in a mass ratio of 10-15 g:0.5-0.8 g:1 L to obtain a negatively charged impregnation solution, soaking the base membrane in the negatively charged impregnation solution in air environment with relative humidity of 40-60% for 2-3 hours, drying in shade to obtain a semifinished product, adjusting pH of a crosslinking agent solution to 12-13, soaking the semifinished product in the crosslinking agent solution for 20-40 minutes, crosslinking in an oven at 60-80℃ for 2-3 hours, and cooling to room temperature. USE - Production of negatively charged modified nanofiltration membrane (claimed). ADVANTAGE - The negatively charged modified nano-filtration membrane has high hydrophilicity, high flux characteristics at the same time, and has pollution-resistant characteristics.