▎ 摘　　要

NOVELTY - Preparation of suction-filtration double-layer molecularly imprinted nanocomposite membrane includes preparing silica nanoparticles, dissolving tris(hydroxymethyl)aminomethane hydrochloride and dopamine hydrochloride in deionized water, adjusting pH, adding silica nanoparticles, activated carbon balls and tetracycline, stirring, reacting, washing and drying to obtain polydopamine-based imprinted silica/activated carbon ball; and adding polyvinylidene fluoride powder, polyvinylpyrrolidone and polydopamine-based imprinted silica/activated carbon balls to methylpyrrolidone, stirring and dispersing, defoaming and sealing, stirring, scraping on glass abrasive tool, soaking in deionized water to obtain membrane material, washing, and cutting; mixing graphene oxide, N,N-dimethyl-N-(3-sulfopropyl)-1-octadecylammonium internal salt and glycerol, first grinding, adding kappa-carrageenan aqueous solution, second grinding, centrifuging, and diluting supernatant with water. USE - The method is for preparation of suction-filtration double-layer molecularly imprinted nanocomposite membrane used for selective adsorption and separation of tetracycline in mixed solution containing tetracycline (claimed). ADVANTAGE - The method solves the shortcomings of the existing tetracycline molecularly imprinted polymer that are difficult to recycle and easy to produce secondary pollution. DETAILED DESCRIPTION - Preparation of suction-filtration double-layer molecularly imprinted nanocomposite membrane comprises: (A) mixing tetraethyl orthosilicate and ethanol to obtain solution A, mixing ammonia, ethanol and distilled water to obtain solution B, adding solution A to solution B, mixing while stirring, adding ethanol and deionized water to carry out centrifugal cleaning, collecting solid product, vacuum drying to obtain silica nanoparticles; (B) dissolving tris(hydroxymethyl)aminomethane hydrochloride and dopamine hydrochloride in deionized water to obtain mixed solution, adjusting pH, adding silica nanoparticles, activated carbon balls and tetracycline, stirring, reacting at room temperature, washing with water, and drying to obtain polydopamine-based imprinted silica/activated carbon ball; (C) adding polyvinylidene fluoride powder, polyvinylpyrrolidone and polydopamine-based imprinted silica/activated carbon balls to methylpyrrolidone, stirring and dispersing, defoaming and sealing, stirring, scraping on glass abrasive tool, soaking in deionized water to carry out phase inversion process and obtain membrane material, washing with water repeatedly, and cutting; (D) mixing graphene oxide, N,N-dimethyl-N-(3-sulfopropyl)-1-octadecylammonium internal salt and glycerol, first grinding, adding kappa-carrageenan aqueous solution, second grinding, centrifuging, diluting supernatant with water, vacuum filtering on surface of silica/activated carbon ball nanocomposite imprinted membrane, and drying; (E) mixing ethanol and water, soaking graphene oxide-based suction filtration silica/activated carbon ball nanocomposite imprinted membrane, adding KH-570, heat refluxing, washing with alcohol, and drying to obtain KH-570 modified-graphene oxide-based suction filtration silica/activated carbon ball nanocomposite imprinted membrane; and (F) mixing tetracycline, acrylamide, ethylene glycol dimethacrylate and ethanol, soaking KH-570 modified-graphene oxide-based suction filtration silica/activated carbon ball nanocomposite imprinted membrane, standing, sealing to obtain pre-polymerized solution, adding azobisisobutyronitrile, stirring and reacting under nitrogen atmosphere, eluting with eluent, removing template molecules and unreacted monomers, washing with methanol, and vacuum drying.