▎ 摘　　要

NOVELTY - The graphene oxide nano-filtration membrane has a supporting substrate layer and a graphene oxide layer. The thickness of the graphene oxide layer is 120nm to 200nm. The thickness of the supporting substrate layer is 200 microns to 400 microns. The aperture of the supporting substrate is 200nm to 400nm. The material of the supporting substrate layer is selected from aluminium oxide, zirconium oxide, titanium oxide, silicon oxide and mullite in the single-phase substrate or multi-phase composite substrate. The substrate layer is selected from polyvinylidene fluoride, poly (ether sulfones), polycarbonate, polysulfone, polycarbonate and nylon USE - Graphene oxide nano-filtration membrane for use in industrial waste water treatment and material recovery. ADVANTAGE - The graphene oxide nano-filtration membrane utilizes the small size of the hydration sodium ion and the interaction between the graphene oxide, optimizes the membrane water flux, keeps the membrane interception performance not affected, has good compatibility with the existing graphene oxide film preparation process, and is simple in operation, fast in speed, economic and effective. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation method for a graphene oxide nano-filtration membrane.