▎ 摘　　要

NOVELTY - Preparing a hydrophilic and antibacterial dual-modified ultrafiltration membrane comprises adding graphene oxide to an organic solvent under ultrasonic treatment to obtain a graphene oxide suspension, adding a condensing agent and 3-dimethylaminopropylamine to the graphene oxide suspension for reaction, and collecting the reactants after the reaction. The washed and dried reactants and long-chain halogenated alkanes are added to the organic solvent, and fully reacted at 20 to 80 degrees C for 8 to 24 hours. After cleaning and drying, a quaternized graphene oxide modifier is obtained. The quaternized graphene oxide modifier is added to an organic solvent for ultrasonic dispersion to obtain a GO-Q suspension, then dissolve the polymer membrane matrix material and membrane modifier into the GO-Q suspension at 40-80 degrees C. The reaction is stirred to obtain a uniform casting film solution. After removing the bubbles, the casting film solution is cast on a glass plate. USE - Method for preparing a hydrophilic and antibacterial dual-modified ultrafiltration membrane used as a filter medium in sewage treatment, drinking water purification or seawater desalination pretreatment (claimed). ADVANTAGE - The method enables to prepare a hydrophilic and antibacterial dual-modified ultrafiltration membrane, which shows better mechanical properties, water treatment properties, hydrophilicity, and antibacterial properties. DETAILED DESCRIPTION - Preparing a hydrophilic and antibacterial dual-modified ultrafiltration membrane comprises adding graphene oxide to an organic solvent under ultrasonic treatment to obtain a graphene oxide suspension, adding a condensing agent and 3-dimethylaminopropylamine to the graphene oxide suspension for reaction, and collecting the reactants after the reaction. The washed and dried reactants and long-chain halogenated alkanes are added to the organic solvent, and fully reacted at 20 to 80 degrees C for 8 to 24 hours. After cleaning and drying, a quaternized graphene oxide modifier is obtained. The quaternized graphene oxide modifier is added to an organic solvent for ultrasonic dispersion to obtain a GO-Q suspension, then dissolve the polymer membrane matrix material and membrane modifier into the GO-Q suspension at 40-80 degrees C. The reaction is stirred to obtain a uniform casting film solution. After removing the bubbles, the casting film solution is cast on a glass plate. After being stabilized in the air, it is immersed in distilled water and soaked to obtain a hydrophilic and antibacterial dual-modified ultrafiltration membrane.