▎ 摘　　要

NOVELTY - Large area graphene-based seawater desalination film comprises support layer and at least one composite interlayer structural unit. The composite interlayer structural unit is sequentially provided with a porous graphene layer, a graphene oxide layer and a porous graphene layer from bottom to top. The support layer is located below the composite interlayer structure unit. USE - Used as large area graphene-based seawater desalination film. ADVANTAGE - The film: adopts the method of combining graphene oxide and chemical vapor deposition graphene, so that the chemical vapor deposition porous graphene layer is coated on the upper and lower surfaces of the graphene oxide layer, the expansion of the interlayer spacing of the graphene oxide sheet after water absorption is limited, improves the mechanical properties and durability of the seawater desalination membrane, and obtains graphene-based seawater desalination membrane with large area and high mechanical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the seawater desalination film, comprising (1) using chemical vapor deposition method to prepare porous graphene on a metal substrate to obtain a metal substrate/porous graphene layer sample, (2) bonding the porous graphene side of the metal substrate/porous graphene sample obtained in the step (1) with the polymer and infiltrating the interface with a solvent, then removing the metal substrate by chemical etching, rinsing, and drying to obtain a support layer/porous graphene layer sample, (3) depositing graphene oxide layer on the porous graphene side of the support layer/porous graphene sample obtained in the step (2) to obtain a support layer/porous graphene layer/graphene oxide layer sample, and (4) attaching the porous graphene side of the metal substrate/porous graphene sample obtained in the step (1) to the graphene oxide side of the support layer/porous graphene layer/graphene oxide layer sample obtained in the step (3), then removing the metal substrate by chemical etching, rinsing, and drying.