▎ 摘　　要

NOVELTY - A graphene oxide nano-filtration composite film comprises polyethersulfone porous layer, dopamine layer and graphene oxide layer orderly from bottom to top, where the thickness of polyethersulfone porous layer is 200-800 mu m, the thickness of dopamine layer is 1-50 nm and the thickness of graphene oxide layer is 10-200 nm. USE - Graphene oxide nano-filtration composite film. ADVANTAGE - The graphene oxide nano-filtration composite film is prepared with high performance, selectivity, water flux, retention rate, structural stability and adhesion property. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a graphene oxide nano-filtration composite film.