▎ 摘　　要

NOVELTY - A graphene high molecular polymer composite nanofiltration membrane preparing method involves configuring mixed acid, concentrated sulfuric acid and concentrated phosphoric acid, putting into the container, weighing potassium permanganate, taking graphite. The mixed reactant is placed in a magnetic stirring oil bath and heated, followed by diluting the product with water, centrifuging and centrifuging with water to obtain centrifugal precipitate, drying the centrifugal precipitate to obtain a graphene powder, ultrasonically dispersing the graphene powder in ultrapure water to obtain a graphene solution, adding ultrapure water to dilute to a graphene solution, adding a cationic polyacrylamide solution to the graphene solution, thoroughly stirring and blending, utilizing superfiltration membrane as a base film, applying a solution of a cationic polyacrylamide and a graphene solution on the base film by a solution coating method and placing in oven to obtain the finished product. USE - Method for preparing graphene high molecular polymer composite nanofiltration membrane. ADVANTAGE - The method enables preparing graphene high molecular polymer composite nanofiltration membrane with better filtering promoting action, clear water purification and sedimentation-promoting effect, increased hydrophilicity and selectivity of the membrane, improved performance and better selective separation capacity. DETAILED DESCRIPTION - A graphene high molecular polymer composite nanofiltration membrane preparing method involves configuring mixed acid, concentrated sulfuric acid and concentrated phosphoric acid, putting into the container, weighing the appropriate amount of potassium permanganate, taking an appropriate amount of graphite, slowly mixing the mixed acid along the wall of the cup into a container containing graphite. The mixed reactant is placed in a magnetic stirring oil bath which has been previously heated to 50 degrees C and added with potassium permanganate, and the mouth of the container is closed to prevent impurities from falling into the container and heated at 50 degrees C for 6 hours, followed by adding the diluted hydrogen peroxide to the mixture under heating and stirring at 50 degrees C, cooling to room temperature, subjecting to centrifugal washing treatment to obtain a product, diluting the product with water, centrifuging at 9000 rpm for 3-5 minutes and centrifuging with water to obtain centrifugal precipitate, drying the centrifugal precipitate to obtain a graphene powder, ultrasonically dispersing the graphene powder in ultrapure water to obtain a graphene solution, adding ultrapure water to dilute to a graphene solution, adding a cationic polyacrylamide solution to the graphene solution, thoroughly stirring and blending, utilizing superfiltration membrane as a base film, applying a solution of a cationic polyacrylamide and a graphene solution on the base film by a solution coating method and placing it in 60-80 degrees C oven for 0.5-3 hours to obtain the finished product.