▎ 摘　　要

NOVELTY - A modified polyamide film comprises polyamide film and poly-dopamine/polyethylene imine co-deposition layer. The polyamide film is distributed with carboxyl functionalized graphene oxide. The modified polyamide film has thickness of not greater than 2 mu m. USE - The modified polyamide film is used for composite film. ADVANTAGE - The modified polyamide film has good hydrophilicity and stability and excellent removing effect to the pollutant. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of the modified polyamide film comprising providing blending liquid containing dopamine and polyethyleneimine, providing carboxyl functionalized graphene oxide, second blend of organic amine and surfactant, providing organic solutions containing organic acid chlorides, providing support porous film, making porous film of the supporting carrier and blending liquid I and blending liquid II contact with organic solution to obtain dry precursor, and drying; and (2) a composite film comprising carrier polyethersulfone filter film and modified polyamide film deposited on base film.