▎ 摘　　要

NOVELTY - Method for preparing graphene oxide film, involves (a) mixing graphene oxide and solvent, and ultrasonically treating to obtain a graphene oxide dispersion liquid, (b) centrifuging the graphene oxide dispersion liquid, and separating the non-peeled large-size graphite sheet, and taking supernatant to obtain a thin layer graphene sheet dispersion liquid, (c) centrifuging the thin layer graphene sheet dispersion liquid to obtain large-size thin layer graphene nanosheets, (d) mixing the large-size thin layer graphene nanosheets with solvent, and ultrasonically treating to obtain a large-size thin layer graphene nanosheet dispersion liquid, and (e) compounding the large-size thin layer graphene nanosheet dispersion liquid to the surface of high-molecular polymer filter membrane or inorganic filter membrane to obtain a membrane material with graphene oxide separation layer. USE - The method is useful for preparing graphene oxide film (claimed). ADVANTAGE - The method is environmentally-friendly, simple and easy, and regulates the thickness of film material by adjusting the amount of raw materials usage.