▎ 摘　　要

NOVELTY - Nanofiltration membrane constructed based on two-dimensional metal-organic framework (MOF) sheet layer and graphene oxide sheet layer, comprises composite membrane formed by co-stacking of the two-dimensional MOF lamella and graphene oxide lamella USE - The nano-filtration membrane is used for separating from seawater, brackish water or other waste water to obtain drinking water. ADVANTAGE - The preparation method improves stability of obtained nanofiltration membrane and gives attention to permeability and selectivity of membrane. The metal ion in the two-dimensional MOF layer and the carboxyl or hydroxyl in graphene oxide layer generate the function of chelate, enhancing the interlayer force. On the other hand, high porosity of 2-dimensionalMOF layer provides permeable channel, to improve permeability of film. The two aspects are combined with each other, so that nanofiltration membrane has high stability and high permeability, realizing effective interception of anionic impurities in water. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation method-filtration membrane, involves (1) preparing MOF bulk material, (2) stripping MOF bulk material into two-dimensional MOF sheets, (3) preparing composite dispersion liquid by utilizing graphene oxide sheet layer and two-dimensional MOF sheet layer and (4) preparing nanofiltration membrane by using composite dispersion liquid. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a nanofiltration membrane composite route (Drawing includes non-English language text).