▎ 摘　　要

NOVELTY - A hollow metal organic framework (MOF)-supported graphene oxide composite film is prepared by (1) dispersing MOF particles in water to obtain concentration of 0.5-20 mg/ml MOF aqueous solution; (2) mixing 1-10 mg/ml tannic acid aqueous solution and MOF aqueous solution for 3-120 minutes, centrifuging to obtain precipitate, washing with methanol and water to remove impurities and obtain etched hollow MOFs (eMOF), and storing in aqueous phase, where mass ratio of MOF to tannic acid is 1:1-5; and (3) dispersing graphene oxide in water to obtain aqueous graphene oxide solution having concentration of 0.02-1 g/L, ultrasonically stirring, adding eMOF to graphene oxide aqueous solution to obtain mixed solution, suction-filtering on polymer bottom film, drying in oven for 5-10 minutes, drying in air to obtain hollow MOF-supported graphene oxide composite film, where mass ratio of eMOF to graphene oxide is 0.3-8:1. USE - A hollow metal organic framework (MOF)-supported graphene oxide composite film for separation of salts or dye (claimed). ADVANTAGE - The preparation method is simple and easy to scale up. The performance of the obtained film in nanofiltration is greatly improved.