RT Journal Article
T1 On the fixed charge concentration and the water electroosmotic transport in a cellulose-acetate membrane
A1 Barragán García, Vicenta María
A1 Rueda Sánchez, Cristóbal
A1 Ruiz Bauzá, Carlos
AB The ionic permeselectivity of a cellulose acetate membrane prepared in our laboratory has been studied from membrane potential and electroosmotic flux measurements. The obtained results show that, at low values of the external salt concentration, the membrane behaves in a cationic-exchange way. The membrane fixed charge concentration has been estimated from the membrane potential measurements as similar to 10(-2) mol/liter. Electroosmotic transport decreases notably when the concentration increases, even reversing its sign at concentrations higher than similar to 10(-1) mol/liter. The weak cationic selective character of the membrane and the fact that the anion mobility is higher than the cation mobility in the membrane phase are both considered responsible for the observed significant sign reversal of the electroosmotic permeability.
PB Academic Press Inc Elsevier Science
SN 0021-9797
YR 1995
FD 1995-06-15
LK https://hdl.handle.net/20.500.14352/58450
UL https://hdl.handle.net/20.500.14352/58450
NO 1. Demish, H.U. and Pusch, W., J. Electrochem. Soc. 123, 370 (1976).2. Toyoshima, Y., and Nozaki, H., J. Phys. Chem. 73, 2134 (1969).3. Aizawa, M., Tomono, S., and Suzuki, S., J. Membr. Sci. 6, 235 (1980).4. Higa, M., Tanioka, A. and Miyasaka, K., J. Membr. Sci. 49, 145 (1990).5. Wong, S.J., and Kwak, J.C.T., Desalination 15, 213 (1974).6. Ruiz Bauzá, C., Rueda Sánchez, C., and Díaz Salgado, C., An. Fís. 79, 115 (1983).7. Driolo, E., Ann. Chim. 65, 335 (1975).8. Fernández Pineda, C., and Mengual, J. I., J. Colloid Interface Sci. 61, 95 (1977).9. Lakshminarayanaiah, N., "Transport Phenomena in Membranes." Academic Press, New York, 1969.10. Kimura, Y., Lim, H.J., and Iijima, T., J. Membr. Sci. 18, 285 (1984)11. Katchalsky, A., and Curran, P.I., "Nonequilibrium Thermodynamics in Biophysics." Harvard Univ. Press, Cambridge, MA. 1967.12. Laksminarayanaiah, N., J. Electrochem. Soc. 116, 338 (1969).13. Tasaka, M., Tamura, S., Takemura, N., and Morimoto, K., J. Membr. Sci. 12, 169 (1982).14. Demisch, H.U., and Pusch, W., J. Colloid Interface Sci. 76, 445 (1980).15.Khedr, G., Schmitt, A., and Varoqui, R., J. Colloid Interface Sci. 66, 516 (1978).16. Helfferich, F., "Ion-Exchange." McGraw-Hill, New York, 1962.17. Hinton, J.F., and Amis, E.S., Chem. Rev. 71, 627 (1971).18. Bockris, J., and Reddy, A., "Modern Electrochemistry," Vol. 1. Plenum Rossetta, New York, 1973.
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