▎ 摘　　要

NOVELTY - Treating wetted layer spacing controllable graphene oxide film involves dipping graphene oxide film in aqueous solution of inorganic salt solution or inorganic alkali solution for 0.2-1 hour. The aqueous solution of inorganic salt solution or an inorganic alkali solution has concentration of 0.10-1.0 mol/L. USE - Treating wetted layer spacing controllable graphene oxide film used for sea water desalination, and sewage purification or gas separation, and dry layer spacing controllable graphene oxide film used in the field of batteries and capacitors (all claimed). ADVANTAGE - The method is simple and easy to operate, and precisely controls layer spacing of graphene oxide film in dry state and wet state within range, and performs dimensional change with amplitude. The graphene oxide film treated does not break easily. The olefin membrane has the function of screening and filtering smaller ions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of dry layer spacing controllable graphene oxide film, which involves centrifugally removing graphite oxide, and drying surface solution of olefin film in an oven at 65-75 degrees C, preferably 70 degrees C for 10-14 hours, preferably 12 hours.