▎ 摘　　要

NOVELTY - Preparation of bionic suction filtration type double-layer molecularly imprinted nanofiber composite membrane involves forming dopamine-doped polyvinylidene fluoride porous membrane (A), dissolving tris(hydroxymethyl)aminomethane hydrochloride in deionized water, adding tetracycline, immersing the membrane (A), adjusting pH value, reacting, washing, drying to produce polydopamine-based imprinted polyvinylidene fluoride porous membrane (B), preparing polydopamine tetracycline imprinted graphene oxide and silica (C), diluting resulting product with deionized water, ultrasonically treating, performing suction filtration on the surface of the membrane (B), drying, eluting with eluent, washing with methanol and drying in a vacuum. USE - Preparation of bionic suction filtration type double-layer molecularly imprinted nanofiber composite membrane used for selective adsorption and separation of tetracycline in mixed solution containing tetracycline (claimed). ADVANTAGE - The composite membrane has high selectivity, adsorption capacity and stability. DETAILED DESCRIPTION - Preparation of bionic suction filtration type double-layer molecularly imprinted nanofiber composite membrane involves adding a predetermined amount of polyvinylidene fluoride powder to a mixed solution of dimethylacetamide and acetone, stirring, adding dopamine, stirring, uniformly dispersing, performing electrospinning using blended solution as spinning raw material and syringe with an 18-gauge needle at predetermined flow rate, spinning width, spinning height and spinning voltage, drying to obtain a dopamine-doped polyvinylidene fluoride porous membrane (A), dissolving tris(hydroxymethyl)aminomethane hydrochloride in deionized water to obtain a mixed solution, adding tetracycline, immersing the membrane (A), adjusting pH value, reacting for predetermined time, washing, drying to produce polydopamine-based imprinted polyvinylidene fluoride porous membrane (B), mixing tetraethylorthosilicate and ethanol to obtain solution (a), mixing ammonia, ethanol and distilled water to obtain solution (b), adding solution (a) to solution (b), stirring, adding ethanol and deionized water, centrifuging, collecting the solid product, vacuum drying to obtain silica nanoparticles, dissolving tris(hydroxymethyl)aminomethane hydrochloride and dopamine hydrochloride in deionized water to obtain a mixed solution, adjusting the pH value, adding silica nanoparticles, graphene oxide and tetracycline, stirring, reacting, washing, drying to obtain polydopamine tetracycline imprinted graphene oxide and silica (C), diluting resulting product with deionized water, ultrasonically treating, performing suction filtration on the surface of the membrane (B), drying, eluting with eluent, washing with methanol and drying in a vacuum.