▎ 摘　　要

NOVELTY - High-performance nano-filtration membrane comprises graphene quantum dot polyamide composite nano-filtration membrane as a base membrane, arginine as a modified modification molecule, and aqueous solution soaked in the modified modification molecules in aqueous solution for hydrothermal treatment to perform modification of the nano filtration membrane, where the flux of nano-filtering membrane can reach up to 40.3-40.3 l/ (m2 hours bar), and has 99.4% ultra-high sodium sulfate interception rate, and the separation factor of sulfate ion and chloride ion can reach 309.5-309.5. USE - High-performance nano-filtration membrane. ADVANTAGE - The preparation process is simple, strengthening the nanofiltration membrane separation performance, taking the graphene- supporting interface aggregate the quantum dot polyamide nano-filtration membrane as the base realizing the ultra-thin base film, which effectively improves the permeation flux of the nano-filtration membrane the modification of arginine, adjusts the nanofiltration membrane performance, and obviously improves the interception rate of the nanofiltration membrane. The obtained high performance nanofiltration membrane of sodium sulfate interception rate is more than 99.4 %, and the osmotic flux is more than 40 L/ (m2 h bar). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a high-performance nanofiltration membrane, which involves: configuring piperazine and graphene quantum dot solution as aqueous phase solution, trimesoyl chloride n-heptane solution as organic phase solution, presetting the polyacrylonitrile ultrafiltration membrane in the aqueous phase solution, and adding the organic phase solution to the surface of the aqueous phase solution, the ultrafiltration membrane is lifted, so that the polyamide separation layer is attached to the ultrafiltration membrane, and the graphene quantum dot polyamide composite nanofiltration membrane is obtained after heat treatment; oaking the graphene quantum dot polyamide composite nanofiltration membrane in a mass percentage of 0.025-0.15 wt.% arginine in aqueous solution, reacting at 30-80℃, taking it out, washing and drying to get a high-performance nanofiltration membrane.