▎ 摘　　要

NOVELTY - Mixed matrix membrane comprises polyimide and graphene oxide doped in polyimide and surface and internal structure of mixed matrix film are different. The surface of mixed matrix membrane is a dense layer and is substantially free of pores. The interior of mixed matrix membrane is a porous structure and pore size of porous structure is greater than or equal to 3 mu m. USE - The mixed matrix membrane is useful for sea water desalting treatment (claimed). ADVANTAGE - The mixed matrix membrane has good hydrophilicity, mechanical strength and preparation method is simple, economical and suitable for large-scale production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing matrix membrane, comprising (i) taking mixed slurry comprising first solvent and graphene oxide powder and polyimide powder dispersed in first solvent, and (ii) curing mixed slurry, dipping resulting film immediately into second solvent and performing soaking treatment; and (2) article, comprising mixed matrix membrane.