Preparation method of graphene oxide-polyethylene glycol/polyvinylidene fluoride composite ultrafiltration membrane

The invention relates to a preparation method of a graphene oxide-polyethylene glycol/polyvinylidene fluoride composite ultrafiltration membrane. The preparation method comprises the following steps:carrying out esterification reaction on graphene oxide and polyethylene glycol to form graphene oxide-polyethylene glycol as a hydrophilic material for later use; dissolving a set amount of graphene oxide-polyethylene glycol in an N, N-dimethylformamide solvent, and carrying out ultrasonic dispersion; adding a set amount of polyvinylidene fluoride and polyvinylpyrrolidone into the ultrasonically dispersed solution to form a blending system, stirring and dissolving in a water bath at a set temperature to obtain a uniform solution, standing and defoaming to obtain a membrane casting solution; coating a glass plate with the membrane casting solution through a membrane scraper to form a membrane, putting the membrane into a coagulating bath for split-phase molding, taking out the membrane after dipping for 2 hours, wa