▎ 摘　　要

NOVELTY - Layer-by-layer self-assembly preparation method of graphene oxide nanofiltration membrane comprises (i) weighing a certain mass of flake graphite oxide, adding pure water to prepare 80 ml graphite oxide solution, ultrasonically treating to obtain graphite oxide dispersion, (ii) weighing a certain amount of polyelectrolyte additive, adding water and magnetically stirring to prepare 80 ml additive solution, and stirring for 1 hours, and (iii) mixing the graphite oxide dispersion and additive solution as pressure filtration solution, uniformly stirring, and pouring into ultrafiltration cup, pressurizing and filtering at 1.6 bar, stopping pressurizing when the permeate volume is 125 ml, and drying the membrane. USE - Layer-by-layer self-assembly preparation method of graphene oxide nanofiltration membrane. ADVANTAGE - The membranes showed significant improvements in hydrophilicity, water flux, and solute retention. The method is efficient and feasible, and the prepared membrane thickness is controllable, which can meet the separation requirements of many occasions, and has the application potential of industrial scale-up. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene oxide nano-filtration membrane, prepared as mentioned above.