The objective of this study is to investigate the feasibility of applying capacitive deionization (CDI) integrated with a monovalent anion permselective exchange membrane (PSMCDI) to remove chloride selectivity from a solution of mixed chloride and sulfate ions. Two types of membranes (ASC and ASV) were evaluated for selectivity removal of monovalent and divalent anions. A variety of parameters (anion composition and concentration

pH

operating time

voltage

and flow rate) were investigated to achieve a maximum selectivity. The selectivity for monovalent anions was evaluated by a lab-made MCDI with a model aqueous system (Cl-/SO42-). The results show that the removal amount of anions increased with increasing anion concentration

but the selectivity for monovalent anions (Cl-) decreased. The selectivity also decreased with operating time. For the ASV membrane

a monovalent anion selectivity of 1.6 was obtained under the conditions of 1.2 V operating voltage

10 min adsorption time and 30 ml·min-1 feed flow rate. The corresponding monovalent anion removal selectivity was 1.4 for the ACS membrane. The results in this study can help in developing the PSMCDI technology

and expand its application for removing monovalent anions from a mixed solution.