Simultaneous, monovalent ion selectivity with polyelectrolyte multilayers and intercalation electrodes in capacitive deionization

Selective ion separation via capacitive deionization (CDI) is of relevance because its environmental and industrial applications in water purification softening, heavy metal removal, resource recovery. Conventionally, carbon electrodes ion-selective membranes have been used for selective removal anions cations. In this study, we engineered a CDI cell with two identical NiHCF electrodes, separated by an anion–exchange membrane coated polyelectrolyte multilayer (PEM), simultaneous monovalent over divalent The modified rejects while the selectively adsorb ions. A factor (?) 7 < ? 14 was obtained Cl? SO42?, average ? 17 Na+ Mg2+, reflecting preference respectively. Moreover, preserved at low concentrations ions as well. This tandem use intercalation PEM provides new facile method cation anion selectivity CDI, opening avenues enhanced tunable separations from complex mixtures