Abstract
In this paper it was analyzed the ion exchange isotherm of K+, Ca2+ and also Cr3+ ions with NaA zeolites at three temperatures: 30, 45 and 60°C. The NaA isotherms were favorable for the metal cations studied. Differences in shape are due to the different influence of temperature in the interaction of the in-going cation with the zeolite framework. As a consequence, sites of different energies were used in the exchange process, which provided non linear Kielland plots. Equilibrium constant, standard free energy, enthalpy and enthopy changes were measured and tabulated. Equilibrium constant is directly proportional to the in-going ion charge. Concerning enthalpy, endothermic and exothermic exchanges were observed due to differences in the cation-framework interaction. The selectivity order based on the standard free energy over the entire temperature range was K+ < Cr3+ < Ca2+, a consequence of different ion exchange mechanisms. It was also noted that the entropy change increases with the polarizibility of the cations.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Arroyo, P.A., M.A.S.D. Barros, M.V. Querino, I.A. Ferreira Jr., and E.F. Sousa-Aguiar, "Troca multicomponente dinâmica em sistemas zeol´ýticos," Revista Tecnol´ ogica, Special Ed., 31-38 (2000).
Barrer, R.M. and J. Klinowski, "Influence of Charge Density on Ion-exchange Properties of Zeolites," J. Chem. Soc. Faraday Trans. I, 68, 1956-1963 (1972).
Barri, S.A.I. and L.V.C. Rees, "Binary and Ternary Cation Exchange in Zeolites," J. of Chromatography, 201, 21-34 (1980).
Barros, M.A.S.D., P.A. Arroyo, E.F. Sousa-Aguiar, and P.A. Garc´ýa, Problemas Ambientais com Soluc¸öes Catal´ýticas. I. O cromo no processamento de peles. Ed. CYTED, Madrid-Spain, 2001.
Barros, M.A.S.D., Avalia¸cäo do Mecanismo de Troca Iônica de Cromo em Sistemas Zeol´ýticos. Doctorate Thesis, PEQ/UEM, Maring´ a-Brazil, 2003.
Barros, M.A.S.D., P.A. Arroyo, C.R.G. Tavares, and E.F. Sousa-Aguiar, "Multicomponent Ion Exchange Isotherms in NaA Zeolite," Chemical Engineering Transactions, 3, 1375-1381 (2003a).
Barros, M.A.S.D., I.F. Ara´ujo Jr, P.A. Arroyo, E.F.S. Aguiar, and C.R.G. Tavares, "Multicomponent Ion Exchange Isotherms in NaX Zeolite," Latin American Applied Research, 33, 339-344 (2003b).
Bi¡skup, B. and B. Suboti´c, "Removal of Heavy Metal Ions from Solutions by Means of Zeolites. I. Thermodynamics of the Exchange Processes between Cadmium Ions from Solution and Sodium Ions from Zeolite A," Sep. Sci. and Technol., 33(4), 449-466 (1998).
Bi¡skup, B. and B. Suboti´c, "Removal of Heavy Metal Ions from Solutions by Means of Zeolites. II. Thermodynamics of the Exchange Processes between Zinc and Lead Ions from Solutions and Sodium Ions from Zeolite A," Sep. Sci. and Tech., 35(14), 2311-2326 (2000).
Breck, D.W., Zeolite Molecular Sieves, Robert E. Krieger Publishing Company, Malabar-FL-USA, 1974.
Cotton, F.A. and G. Wilkensen, Advanced Inorganic Chemistry, 5th ed., John Wiley & Sons, USA, 1988.
Franklin, K.R. and R. Townsend, "Multicomponent Ion Exchange in Zeolites," J. Chem. Soc. Faraday Trans. I., 81, 1071-1086 (1985).
Giannetto, G., A. Montes, and G. Rodriguez, Zeolitas Caracter´ýsticas, Propiedades y Aplicaciones Industriales, Ed. Innovaci´ on Tecnol´ ogica, Facultad de Ingenier´ýa, UCV, Caracas, Venezuela, 2000.
Keane, M.A., "Role of the Alkali Metal Cocation in the Ion Exchange of Y Zeolites I. Alkali Metal and Nickel Ion-Exchange Equilibria," Microporous Materials, 3, 93-108 (1994).
Keane, M.A., "The Removal of Copper and Nickel from Aqueous Solution using Y Zeolite ion Exchangers," Colloids and Surfaces A: Physicochemical and Engineering Aspects, 138, 11-20 (1998).
Maes, A. and A. Cremers, "Ion Exchange of sybthetic Zeolite X and Y with Co 2 +,Ni 2 +,Cu 2 +and Zn 2 +Ions," J. Chem. Soc. Farad. Trans. I., 71, 265-274 (1975).
Meissner, H.P. and C.L. Kusik, "Activity Coefficients of Strong Electrolytes in Multicomponent Aqueous Solutions," AIChE J., 18(2), 294-298 (1972).
Nightingale Jr., E.R., "Phenomenological Theory of Ion Solvation Effective Radii of Hydrated Ions," J. Phys. Chem., 63, 1381-1387 (1959).
Richard, F.C. and A.C.M. Bourg, "Aqueous Geochemistry of Chromium: A Review," Wat. Res., 25(7), 807-816 (1991).
Sherry, H., "The Ion-Exchange Properties of Zeolites. IV. Alkaline Earth Ion Exchange in Synthethic Zeolites Linde X and Y," The J. Phys. Chem., 72(12), 4086-4094 (1968).
Shibata, W. and K. Seff, "Pb 2 +Exchange Isotherms for Zeolite Na-X at pH 5, 6, and 7," Zeolites, 19, 87-89 (1997).
Tagami, L., O.A.A. Santos, E.F. Sousa-Aguiar, P.A. Arroyo, and M.A.S.D. Barros, " NaY and CrY Zeolites Ion Exchange.Thermodynamics," Acta Scientiarum, 23(6), 1351-1357 (2001).
Wiers, B.H., R.J. Grosse, and W.A. Cilley, "Divalent and Trivalent Ion Exchange with Zeolite A," Environ. Sci. Technol., 16, 617-624 (1982).
Zemaitis, J.F., D.M. Clark, D.M.M. Rafal, and N.C. Scrivner, Handbook of Aqueous Electrolyte Thermodynamics, DPIR, New York-USA, 1986.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Barros, M., Arroyo, P., Sousa-Aguiar, E. et al. Thermodynamics of the Exchange Processes between K+, Ca2+ and Cr3+ in Zeolite NaA. Adsorption 10, 227–235 (2004). https://doi.org/10.1023/B:ADSO.0000046359.58855.9f
Issue Date:
DOI: https://doi.org/10.1023/B:ADSO.0000046359.58855.9f