▎ 摘　　要

NOVELTY - Preparing a double-layer nanofiber membrane involves dissolving chitosan in acetic acid solution, dissolving polyvinyl alcohol in ionized water, and mixing the two solutions uniformly to obtain the first layer of electrostatic spinning solution which is spun into the first layer of nanofiber membrane by electrospinning technology and cross-linked with an ethanol solution of glutaraldehyde. The polyvinylidene fluoride is dissolved in N-N dimethylacetamide, fluorinated graphene is added, stirred uniformly to obtain a second layer of the electrostatic spinning solution followed by spinning solution into a second layer of nanofiber membrane on the first layer of the membrane by electrostatic spinning technology to obtain a double layer of electrospinning membrane. USE - Method for preparing double-layer nanofiber membrane for water-oil separation. ADVANTAGE - The membrane has a super-hydrophobicity and porous structure, which can realize efficient water-oil separation.