Abstract
This paper examined permselectivity coefficients for Li＋/Co2＋ in electrodialysis through a mono polar cation-exchange membrane, SELEMION CMV, and a monovalent selective cation-exchange membrane, NEOSEPTA CIMS. In the electrodialysis with mono polar membrane, lithium and cobalt ions competitively were transported through the membrane under the wide range of equivalent molar fraction of lithium. The permselectivity coefficient for Li＋/Co2＋ ranged from 0.1 to 0.4. On the other hand, for the monovalent selective cation-exchange membrane, the permeation of cobalt ions to lithium ions greatly decreased, so the permselectivity coefficient was remarkably high, and ranged from 3 to 29 under the conditions studied. These results indicated that a monovalent selective cation-exchange membrane is effective for selective permeation of lithium.
