▎ 摘　　要

NOVELTY - Polyethylene substrate composite graphene oxide nanofiltration membrane has pure water flux rate of 55-85 L/m2h at 0.5 MPa, and divalent salt retention rate of more than 92%. USE - Polyethylene substrate composite graphene oxide nanofiltration membrane. ADVANTAGE - The polyethylene substrate composite graphene oxide nano-filtration membrane has symmetrical film structure, low transmission resistance, high tensile strength, solvent resistance, anti-aging ability, longer service life, strong functionality, strong ion selectivity, and wide prospect in future industrialization application. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of polyethylene substrate composite graphene oxide nanofiltration membrane comprising washing polyethylene substrate with isopropanol, drying, placing in oxidizer for modification, soaking, fixing, drying at room temperature, taking graphene oxide solution, adding metal ions and dispersant, loading graphene oxide solution on modified polyethylene substrate under pressure of 0.1 MPa, putting into oven for heat treatment, soaking nascent nanofiltration membrane in polyvinyl alcohol solution containing crosslinking agent, placing in oven for thermal crosslinking, drying and storing.