▎ 摘　　要

NOVELTY - Nacreous structure graphene oxide flexible film is claimed. The film is a graphene in the form of a sheet, interspersing 1,6-bis(3-vinylimidazolium chloride) hexane, tetrakis(3-mercaptopropionic acid) pentaerythritol ester as a cross-linking agent and forms a graphene oxide flexible film. USE - The film is useful for recovering rhenium (claimed). ADVANTAGE - The method: is quick and simple; has mild reaction conditions and is environmentally friendly and pollution-free. The film has flexibility; can be curled and has high separation and enrichment efficiency for rhenium elements and practical application. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing film comprising (a) carrying out ultrasonic dispersion of graphene oxide in N,N dimethylformamide, successively adding tetrakis(3-mercaptopropionic acid) pentaerythritol ester and azobisisobutyronitrile, condensing and refluxing under nitrogen protection at 70 degrees C for 15-17 hours, centrifuging the reaction solution, dispersing the solid product again in anhydrous methanol to obtain a dispersion solution and (b) sequentially adding N,N-dimethylformamide, tetrakis(3-mercaptopropionic acid) pentaerythritol ester, benzoin dimethyl ether and 1,6-bis(3- vinylimidazolium chloride) hexane to the above dispersion, carrying out ultrasonic dispersion for 1 hour, quickly pouring into a Petri dish, performing ultraviolet light irradiation for 3-4 hours, cooling, forming a film on the Petri dish, eluting the film with water, sequentially placing the film in N, N-dimethylformamide, anhydrous methanol and water and air-drying at room temperature to obtain film; and (2) use of film for recovering rhenium comprising taking a solution containing rhenium ions, adjusting the pH of the solution to 1-7, adding the flexible film, performing shaking adsorption at 30 degrees C and 180-200 revolutions/minute for 24 hours, filtering and drying.