Bi-ionic potential: Experimental measurements and diffusion coefficients determinations

作者：Ibanez Mengual Jose A; Garcia Gamuz Jose A; Valerdi Perez Ramon P^*

来源：Desalination and Water Treatment, 2011, 36(1-3): 81-88.

DOI：10.5004/dwt.2011.2072

• Ion-exchange membranes
• Transport phenomena
• Bi-ionic potential

The bi-ionic potential of charged membranes has been studied theoretically and limiting expression corresponding to not negligible diffusion boundary layer effects has been used. A system formed by two electrolyte aqueous phases bathing an ion-exchange membrane was studied in order to determine the bi-ionic potential, in the case of a ionics cation exchange membrane. The experiments were conducted at different concentration solutions and temperature. To do it a new device was designed and constructed allowing the measuring of potential membrane in the bi-ionic system. The values obtained show a concentration dependence with different maximum values for each temperature. A theoretical model given the bi-ionic potential as a function of diffusion coefficients was used to obtain the values for the K+ at different temperatures from the corresponding values of Na+ measured by means a rotating diffusion cell.

• 出版日期2011-12