▎ 摘　　要

NOVELTY - Graphene oxide composite nano-filtration membrane comprises a base film, whose surface is embedded with high molecular nano material of graphene oxide nanofiltration film; where the graphene oxide nanofiltration membrane embedded with high molecular nano material is obtained by embedding the high molecular nano material in the sheet layer of the graphene oxide material in a cross-linking manner. USE - The graphene oxide composite nano-filtration membrane is used in treating dye-containing high-salt wastewater, or decolorization treatment of the dye-containing high-salt wastewater (claimed). ADVANTAGE - The method is simple, easy for batch production, and produces nanofiltration membrane with stable structure, stable performance, and excellent inorganic salt/dye separation performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparation method of the graphene oxide composite nanofiltration membrane comprising coating material containing the graphene oxide, macromolecule nano material and crosslinking agent mixed solution on the surface of the base film, and carrying out crosslinking reaction, by means of crosslinking the high molecular nano material embedded in the oxide graphene material of the interlayer, at the same time, the surface of the base film is formed with a graphene oxide nanofiltration film embedded with high molecular nano material, obtaining the graphene oxide composite nano-filtration membrane; preferably, in the mixed solution, the weight ratio of the polymer nano material and the graphene oxide material is 0.125-16, more preferably 0.5-8; in the mixed solution, the amount of the crosslinking agent is 0.1-30% of the total weight of the graphene oxide material and the polymer nano material, more preferably 0.5-10%; in the mixed solution, the content of the graphene oxide material is 0.5-10 g/l, more preferably 1-4g/l; the coating mode comprises at least one of wire rod coating, slit coating and micro-concave coating, the temperature of the crosslinking reaction is 20-100℃, more preferably 50-70℃; the crosslinking reaction time is 2 minutes to one week; and use of graphene oxide composite nanofiltration membrane in treating dye-containing high-salt wastewater, or decolorization treatment of the dye-containing high-salt wastewater, where the salt concentration of the dye-containing high salt waste water is 20-200 g/l, the dye concentration is 0.2-5 g/l; more preferably, the salt comprises sodium chloride and/or sodium sulfate; the flux of the graphene oxide composite nanofiltration membrane to treat the dye-containing high-salt wastewater is 2.5-10 l/(m. H. Bar), the dye rejection rate is 90-99.9%, and the desalination rate is less than 15%.2