▎ 摘　　要

NOVELTY - Method for modifying ultrafiltration membrane involves (a) dissolving metal cation crosslinked graphene oxide nanosheet in solvent and adding crosslinking agent, (b) uniformly mixing to obtain a solution, and (c) stacking the graphene oxide nanosheet in solution on a surface of the ultrafiltration membrane under constant-pressure condition. The ratio of solute in crosslinking agent to graphene oxide nanosheet is 10-13500. USE - Method is useful for modifying ultrafiltration membrane using metal cation crosslinked graphene oxide nanosheet, where the ultrafiltration membrane is useful for water treatment. ADVANTAGE - The method ensures simple and easy production of graphene oxide nanosheet-modified ultrafiltration membrane with prolonged service life and improved water treatment efficiency, and is suitable for large-scale production.