▎ 摘　　要

NOVELTY - Preparation method of antibacterial and anti-pollution regenerated cellulose composite ultrafiltration membrane, comprises (a) graphene oxide suspension preparation, (b) preparation of graphene oxide (GO) composite nano-titania particles, (c) ppreparing N-methylmorpholine-N-oxide (NMMO) solvent under heating, adding n-propyl gallate or composite antioxidant containing n-propyl gallate, chitosan and cellulose pulp, and GO-titanium dioxide particles to the NMMO solvent, vacuuming and stirring to dissolve, performing vacuum defoaming or static stop defoaming to obtain a uniform and transparent cellulose/chitosan/GO-titanium dioxide casting solution, and (d) casting the film casting solution obtained in step (c) onto a non-woven fabric or a glass plate, scraping it to make a film, statically defoaming to obtain a primary film, immersing in deionized water to solidify into a membrane, immersing in a glycerol aqueous solution, and drying in the shade to obtain the membrane. USE - The method is useful for preparing antibacterial and anti-pollution regenerated cellulose composite ultrafiltration membrane used for membrane separation process (all claimed), which is useful in sewage treatment, food industry, medical separation and reverse osmosis pre-treatment. ADVANTAGE - The method enables to prepare antibacterial and anti-pollution regenerated cellulose composite ultrafiltration membrane, which has excellent antibacterial performance, and the water flux of the modified material to the membrane will not generate obvious negative influence. DETAILED DESCRIPTION - Preparation method of antibacterial and anti-pollution regenerated cellulose composite ultrafiltration membrane, comprises (a) graphene oxide suspension preparation by adding concentrated sulfuric acid, easily soluble nitrate, natural flake graphite and potassium permanganate to the container, stirring to obtain a suspension, stirring and reacting the obtained suspension for 1.5-3 hours, adding distilled water and hydrogen peroxide solution to it in turn, and continuously stirring until the suspension changes from dark brown to bright yellowish brown, (b) preparation of graphene oxide (GO) composite nano-titania particles by adding nano-titanium dioxide to the yellow-brown suspension prepared in step (a), ultrasonically dispersing, stirring for 18-24 hours, separating to obtain a solid precipitate, and drying in an oven to obtain GO-titanium dioxide particles, (c) preparation of casting solution by preparing N-methylmorpholine-N-oxide (NMMO) solvent with a moisture content of 12-16% under heating at 80-100degrees Celsius, adding n-propyl gallate or composite antioxidant containing n-propyl gallate, chitosan and cellulose pulp, and GO-titanium dioxide particles to the NMMO solvent, vacuuming and stirring to dissolve, and after dissolving, performing vacuum defoaming or static stop defoaming to obtain a uniform and transparent cellulose/chitosan/GO-titanium dioxide casting solution, and (d) film making by uniformly casting the film casting solution obtained in step (c) onto a non-woven fabric or a glass plate, scraping it with a scraper to make a film, statically defoaming to obtain a primary film, immersing the obtained primary film in deionized water to solidify into a membrane, immersing in a glycerol aqueous solution, taking out and drying in the shade to obtain an antibacterial and anti-pollution regenerated cellulose ultrafiltration membrane.