Abstract
The ion-exchange isotherm of sodium and calcium ions and membrane potential measurements of monovalent salts (KCl and NaCl) and monovalent–divalent cation salt mixtures on the polysulfone and polysulfone with polyester support cation exchange membranes have been performed. The equilibrium cation concentration in membranes for monovalent–divalent (NaCl+CaCl2) cation salt mixtures were studied at a total concentration of 0.05 M. The electromotive force values of the cell—Ag,AgCl¦MCl(a′)¦membrane¦MCl(a″)¦Ag,AgCl for monovalent salts and Ag,AgCl¦MCl+CaCl2(á)¦membrane¦MCl+CaCl2(a″)¦Ag,AgCl for monovalent–divalent salt mixtures—were measured. A nonlinear regression method was used to determine effective membrane charge densities. The membrane potential of the monovalent salts for cation exchange membranes is almost linear. Membrane potential values for monovalent–divalent cation mixtures are not linear as a function of NaCl concentration and tend to be zero when the mole fraction of monovalent–divalent salts is equal. The results obtained for polysulfone-type membranes were compared with Neosepta CL-25T and CM2 cation exchange membranes.
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