▎ 摘　　要

NOVELTY - A modified ultrafiltration membrane comprises polyvinylidene fluoride as matrix and cadmium sulfide/graphite phase-carbon nitride/reduced graphene oxide nano photocatalyst as active component which is uniformly distributed on the matrix. USE - Modified ultrafiltration membrane for resisting organic contaminants or bacteria (all claimed). ADVANTAGE - The modified ultrafiltration membrane has high hydrophilicity, good photocatalytic activity, and effectively reduces the membrane pore blocking caused by organic pollutants under visible light irradiation. The membrane has good antibacterial effects, good killing effect on Gram-negative bacteria such as Escherichia coli and Gram-positive bacteria such as Staphylococcus aureus, and effectively inhibits the formation of biofilms on the membrane surface. DETAILED DESCRIPTION - A modified ultrafiltration membrane comprises polyvinylidene fluoride as matrix and cadmium sulfide/graphite phase-carbon nitride/reduced graphene oxide (CdS/g-C3N4/rGO) nano photocatalyst as active component which is uniformly distributed on the matrix. An INDEPENDENT CLAIM is included for preparation of modified ultrafiltration membrane, which involves ultrasonically dispersing cadmium sulfide/graphite phase-carbon nitride/reduced graphene oxide nano photocatalyst in N,N-dimethylacetamide, adding polyvinylidene fluoride and polyvinylpyrrolidone, stirring for 12-16 hours, heating to 80-90 degrees C to form a uniform casting film solution, defoaming the casting film solution under vacuum, scraping into liquid film, leaving still in air, placing the scraped liquid film in water coagulation bath, peeling off the film, immersing in water for 16-30 hours and drying.