▎ 摘　　要

NOVELTY - The preparation of graphene oxide modified composite nano-filtration membrane, involves (1) mixing graphene oxide dispersion liquid and nano-particle dispersion liquid, ultrasonically reacting and magnetically stirring to obtain uniformly mixed dispersion liquid, (2) immersing nano-filtration membrane in dopamine solution, and performing water bath oscillation to obtain processed nanofiltration membrane, (3) vacuum filtering processed nanofiltration membrane, and spraying uniformly mixed dispersion liquid to the processed nanofiltration membrane to obtain the precursor of modified composite nanofiltration membrane, and (4) cleaning the precursor of modified composite nanofiltration membrane and drying. USE - Preparation of graphene oxide modified composite nano-filtration membrane used for treating heavy metal waste water (claimed). ADVANTAGE - The method enables preparing graphene oxide modified composite nanofiltration membrane ensuring increased stability and uniformity, enhanced hydrophilicity, water flux, salt retention rate and heavy metal retention rate. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view illustrating the preparation of graphene oxide modified composite nano-filtration membrane. (Drawing includes non-English language text)