▎ 摘　　要

NOVELTY - Preparing porous graphene oxide nanofiltration membranes, comprises etching graphene oxide nanosheets chemically by concentrated acid to realize in-plane pore formation of the graphene oxide nanosheets, and preparing the porous graphene oxide nanosheets; through the vacuum-assisted self-assembly process, suction filtering the porous graphene oxide nanosheets onto the base membrane to obtain a porous graphene oxide nanofiltration membrane. The pure water permeation flux of the membrane is 30.5-120.9 Lm-2h-1bar-1, and the rejection rate of the four dyes: methyl blue, chrome black T, Congo red and Alcian blue are all greater than 95%. The concentrated acid is concentrated sulfuric acid, concentrated nitric acid, and concentrated phosphoric acid. The base membrane material is polyethersulfone, mixed cellulose, cellulose acetate or polycarbonate. USE - The porous graphene oxide nanofiltration membrane is useful in dye separation. ADVANTAGE - The method is simple and convenient.