▎ 摘　　要

NOVELTY - Preparing graphene oxide-titanium dioxide/poly(vinylidene fluoride) composite ultrafiltration membrane comprises preparing different graphene oxide-titanium dioxide nanocomposites, dispersing it in 60 ml dimethylacetamide for 1 hours with an ultrasonic probe, adding 4 g poly(vinylidene fluoride) and 1 g polyethylene glycol 2000 into the suspension and dissolving it in dimethylacetamide, mechanically agitating the casting solution at 70℃ for at least 10 hours, applying the casting solution to a petri dish, then pouring in deionized water, shaking for 2 seconds, and soaking the obtained membrane in deionized water until use. USE - Used as graphene oxide-titanium dioxide/poly(vinylidene fluoride) composite ultrafiltration membrane. DETAILED DESCRIPTION - Preparing graphene oxide-titanium dioxide/poly(vinylidene fluoride) composite ultrafiltration membrane, comprises (1) placing 5 g graphite powder and 2.5 g sodium nitrate into a 500 ml beaker, adding 120 ml concentrated sulfuric acid, and stirring vigorously for 1 hours under ice bath conditions, slowly adding 15 g potassium permanganate into a beaker with a continuous ice bath to maintain a low temperature (-10℃), continue the ice bath to react for 1 hours, transferring the beaker in the reaction to a water bath at 35℃ for 2 hours, adding 250 ml deionized water and 50 ml 30% hydrogen peroxide solution dropwise under normal temperature water bath conditions, placing in a 98℃ water bath and stirring for 1 hours until completely cooled to normal temperature, washing with 5% dilute hydrochloric acid and deionized water until neutral, drying at 120℃ in an oven for 12 hours, grinding it into powder, (2) placing 0.5 g graphite powder sample into 200 ml absolute ethanol containing beaker for 1 hour of ultrasonic vibration, and completely dispersing the graphite powder sample in absolute ethanol, adding 10 ml tetrabutyl titanate in the reaction system, maintaining the stirring for 1 hours at 25℃, heating at 80℃ while stirring, adding at a speed of 0.85 ml/minute while strong stirring 50 ml water, reacting for 5 hours, many cycles of suction filtration-washing and then drying at room temperature to obtain reaction product graphene oxide-titanium dioxide, adding the prepared graphene oxide-titanium dioxide, 10 g polyethylene glycol and 250 ml absolute ethanol into 500 ml three-necked flask, stirring for 30 minutes at 30℃, adding 0.25 g concentrated hydrochloric acid (37%) to the there-necked flask, heating at 70℃ and stirring the reaction mixture for 3 hours, and (3) dispersing different graphene oxide-titanium dioxide nanocomposites in 60 ml dimethylacetamide for 1 hours with an ultrasonic probe, adding 4 g poly(vinylidene fluoride) and 1 g polyethylene glycol 2000 into the suspension and dissolving it in dimethylacetamide, mechanically agitating the casting solution at 70℃ for at least 10 hours, applying the casting solution to a petri dish, then pouring in deionized water, shaking for 2 seconds, and soaking the obtained membrane in deionized water until use.