The Electrochemical Properties of Polysulfone Ion-Exchange Membranes

✍ Scribed by M. Ersoz

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 82 KB
• Volume: 243
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2001.7832

✦ Synopsis

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 + CaCl 2 ) 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 + CaCl 2 (a )|membrane|MCl + CaCl 2 (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.