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Abstract Selective ion separation via capacitive deionization (CDI) is of relevance because of its environmental and industrial applications in water purification and softening, heavy metal removal, and resource recovery. Conventionally,… Click to show full abstract
Abstract Selective ion separation via capacitive deionization (CDI) is of relevance because of its environmental and industrial applications in water purification and softening, heavy metal removal, and resource recovery. Conventionally, carbon electrodes and ion-selective membranes have been used for selective removal of anions and cations. In this study, we engineered a CDI cell with two identical NiHCF electrodes, separated by an anion–exchange membrane coated with a polyelectrolyte multilayer (PEM), for simultaneous and selective separation of monovalent over divalent anions and cations. The modified membrane rejects divalent over monovalent anions while the NiHCF electrodes selectively adsorb monovalent over divalent ions. A separation factor (β) of 7
Journal Title: Chemical Engineering Journal
Year Published: 2021
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