▎ 摘　　要

NOVELTY - Preparing graphene oxide film involves adding 20-160 mL of graphene oxide suspension with a concentration of 5-50 mg/L, vortexing and sonicating, then allowing to stand still, suction filtering to form a film to obtain the graphene oxide film. USE - Method for preparing graphene oxide film for sieving and separating aqueous solutions of high-valence metal ions (claimed). ADVANTAGE - The method enables to prepare graphene oxide film, which is simple in process, does not require complicated processes, does not require any physical, chemical and other methods of cross-linking control, maintains the water environment infiltration state, and can be directly used for ion interception, is easy to operate, enables the graphene oxide film to efficiently intercept and screen metal high-valence ions, and has good application prospects. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use of graphene oxide film is claimed for sieving and separating aqueous solutions of high-valence metal ions.