Characteristic coefficients for equilibrium between solution and Neosepta or Selemion cation exchange membranes

The Electrochemical Properties of Polysulfone Ion-Exchange Membranes

“…This similar sequence was also correlated for Neosepta, Selemion, Aciplex, and Nafion membranes (17,18). The selectivity of a binary solution of Ca 2+ or Cu 2+ with Na + or protons in cation exchange membranes were studied and reported the selective uptake of divalent cation species over monovalent species (19).…”

Cobalt(II) and Nickel(II) Transfer through Charged Polysulfonated Cation Exchange Membranes

“…The differences in the mole fractions of the ions across the membrane can give rise to different potential gradients for migration of ions and different mobilities in the polymer, which are factors determining metal ion transport through the membrane. Several papers (20)(21)(22) have reported that Cu 2+ is preferentially adsorbed into sulfonated polystyrene/divinylbenzene polymers and that a high concentration of H + /M + ions increased the flux of Cu ions. The cation composition of the polymer also influences the transport mechanism and largely determines the solvation and swelling of the membrane.…”

Recovery and Concentration of Al(III), Fe(III), Ti(IV), and Na(I) from Red Mud

“…Differences in the mole fraction of the ions across the membrane may result in different potential gradients for the migration of ions and their mobility in the polymer, which is a factor determining metal transport through the membrane. Several authors (33)(34)(35) have pointed out that Cu 2+ is preferentially adsorbed onto sulfonated (poly(styrene)/divinylbenzene) polymers with a high concentration of H + /M + ions, which increased the high flux of Cu. Both solutions were stirred at the same rotational speed with a magnetic stirrer to prevent the formation of significant boundary layers and also to ensure that the concentration of metals was uniform in both solutions.…”