▎ 摘　　要

NOVELTY - Preparing lithium-ion selective adsorption film comprises (1) preparing graphene oxide suspension, where the graphene oxide suspension is a graphene oxide solution obtained by the oxidation exfoliation graphite method, where the suspended graphene sheet has a thickness of a single atomic layer, about 0.5-1 nm, and the size of the sheet is 1-50 mum in diameter, (2) preparing the graphene oxide suspension liquid by a drop coating method, a suction filtration method and a spin coating method to obtain a graphene oxide film, (3) subjecting the graphene oxide film prepared in the second step to high temperature thermal reduction treatment to obtain a reduced graphene oxide film, i.e. the lithium-ion selective adsorption film. USE - The method is useful for preparing lithium-ion selective adsorption film, which is useful as a lithium-ion adsorbent for selectively adsorbing lithium ions in salt lake brine (claimed). ADVANTAGE - The method is simple and easy to operate. The film: is not easy to be broken; and has stable properties, and effect of selectively adsorbing lithium ions.