▎ 摘　　要

NOVELTY - Method for evaluating ion screening ability of graphene oxide (GO)/aramid fiber (ANF)/GO composite membrane, involves preparing GO/ANF/GO composite membrane, clamping the GO/ANF/GO composite membrane between the self-made double-conductivity cells, adding electrolyte solution of the concentration (C) in the double-conductivity cells, testing the current signal of the electrolyte solution in the conductivity cell to obtain the specific value of the current signal, evaluating the ion screening performance of the GO/ANF/GO composite membrane based on the size and formula of the current signal. USE - Method for evaluating ion screening ability of graphene oxide/aramid fiber/graphene oxide composite membrane. ADVANTAGE - The method is efficient, simple, practical and time-saving. The GO/ANF/GO composite membrane has excellent mechanical performance and high water stability. DETAILED DESCRIPTION - Method for evaluating ion screening ability of graphene oxide (GO)/aramid fiber (ANF)/GO composite membrane involves preparing GO/ANF/GO composite membrane, clamping the GO/ANF/GO composite membrane between the self-made double-conductivity cells, adding electrolyte solution of concentration (C) to double-conductivity cells, testing the current signal of the electrolyte solution in the conductivity cell to obtain specific value of the current signal, and evaluating the ion screening performance of the GO/ANF/GO composite membrane based on the size and current signal specific value obtained by the relation: ion selectivity = 2×potassium ion current/magnesium ion current (I). The current value corresponding to the specific voltage is substituted into the relation (I). When the ion selectivity is high, the ion screening performance of GO/ANF/GO composite membrane is high. When the ion selectivity is low, the ion screening performance of the GO/ANF/GO composite membrane is low.