▎ 摘　　要

NOVELTY - Preparing a graphene oxide-based two-dimensional composite film embedded with a crosslinked network of a sulfonated polymer involves adding sodium styrene sulfonate and divinylbenzene to a colloidal solution of graphene oxide, a radical polymerization reaction is initiated under the initiator of azobisisobutyronitrile. The polymerized mixed dispersion is deposited on a porous substrate to obtain a graphene oxide-based two-dimensional composite film embedded with a crosslinked network of a sulfonated polymer. USE - Method for preparing a graphene oxide-based two-dimensional composite film embedded with a crosslinked network of a sulfonated polymer for separating metal ions of different sizes and charge properties, where metal ions include Na+, K+, Li+, Ca(2+), Mg(2+), Ni(2+), Cd(2+), Cu(2+), Al(3+), Fe(3+), Cr(3+) (all claimed). ADVANTAGE - The method enables to prepare a graphene oxide-based two-dimensional composite film embedded with a crosslinked network of a sulfonated polymer, which has a higher ion permeability rate and more excellent selectivity.