▎ 摘　　要

NOVELTY - Method for preparing a graphene hydrophobic film, involves (ia) adding graphene oxide powder to a solvent to prepare a suspension dispersion liquid, and (ib) removing the solvent in the suspension dispersion liquid and subjecting to a hydrophobic treatment to obtain the finished product, or (iia) treating graphene oxide to obtain reduced graphene oxide, (iib) adding reduced graphene oxide powder to a solvent to prepare a suspension dispersion liquid, and (iic) removing the solvent in the suspension dispersion liquid and subjecting to a hydrophobic treatment to obtain the finished product. USE - The method is useful for preparing a graphene hydrophobic film for membrane distillation (claimed). ADVANTAGE - The method provides graphene hydrophobic film by a simple process, combines the characteristics of membrane distillation to realize separation of various media such as protium water/heavy water, protium water/tritiated water and water with different isotopes (H216O/H218O), has high separation efficiency and low energy consumption, does not need to heat the liquid to steam, and is based on the membrane distillation process route and very easy for large-scale application. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a membrane distillation application method, involving (x) assembling the graphene hydrophobic film into a separation membrane module, and (y) contacting different isotope liquids with the separation membrane module and separating various media in the liquid using a membrane distillation mode.