▎ 摘　　要

NOVELTY - Preparation of composite nanofiltration membrane coated with graphene oxide involves adding oxidized graphene and polymer to solvent, cooling stirred mixture to obtain polymer solution, preparing porous polymer support layer containing graphene oxide by liquid-solid phase transformation using non-woven fabric as supporting material, adding pH adjusting agent to water, stirring mixture to obtain solution (A), adding trimesoyl chloride to organic solvent, stirring mixture to obtain solution (B), immersing porous polymer support layer in solution (A) and solution (B) and drying material. USE - Preparation of composite nanofiltration membrane coated with graphene oxide (claimed). ADVANTAGE - The method enables preparation of composite nanofiltration membrane coated with graphene oxide having excellent high-temperature resistance. DETAILED DESCRIPTION - Preparation of composite nanofiltration membrane coated with graphene oxide involves (a) adding oxidized graphene to solvent, stirring mixture for 0.5-2 hours, adding polymer, stirring mixture at 60-120 degrees C for 6-10 hours, degassing mixture, cooling stirred mixture to 10-40 degrees C to obtain polymer solution, (b) subjecting polymer solution to liquid-solid phase transformation for preparing a porous polymer support layer containing graphene oxide using non-woven fabric as supporting material, (c) activating the porous polymer support layer containing graphene oxide by a functional group activator solution, (c) adding 0.1-5.0 wt.% piperazine, 0.001-5.0 wt.% surfactant and a pH adjusting agent to water, stirring mixture for 10-30 minutes to obtain solution (A) with pH value of 8-12, adding 0.01-2.0 wt.% trimesoyl chloride to organic solvent, stirring mixture for 10-30 minutes to obtain solution (B), and (d) immersing obtained porous polymer support layer in solution (A) for 1-100 seconds, draining surface water droplets, immersing support layer in solution (B) for 1-200 seconds, carrying out water treatment for 2-20 minutes, immersing layer in 0.5-20% mass concentration of glycerol at 15-80 degrees C for 5-30 minutes and drying material.