▎ 摘　　要

NOVELTY - Method for preparing sandwich graphene oxide hollow fiber film with fixed interlayer distance comprises: sealing one end of the hollow fiber substrate and soaking it in the graphene oxide (GO) suspension; depositing the graphene oxide layer on the surface of the hollow fiber substrate by vacuum pumping; dissolving the polymer in the organic solvent to obtain the polymer solution; removing the bubbles in the solution; soaking the graphene oxide hollow fiber film obtained in the polymer solution; placing the sandwich film in water; drying to obtain the sandwich graphene oxide hollow fiber film. USE - Method for preparing sandwich graphene oxide hollow fiber film with fixed interlayer distance using sandwich graphene oxide hollow fiber film with fixed interlayer distance. ADVANTAGE - The method maintains the physical and chemical properties of the graphene oxide membrane, can be used to synthesize a sandwich graphene oxide hollow fiber membrane with higher separation performance; and can effectively remove inorganic salts that cannot be processed by normal graphene oxide membranes, has retention rate high as 90% or more, high stability while maintaining high separation performance, and can even withstand ultrasonic treatment.