Abstract
A comparison is made of the ion exchange behavior, towards the cobalt ion, of five sodium montmorillonite clays. The selectivity for the bivalent ion at low cobalt loading is correlated with the average dimensions of the particles in the various clays, as characterized by several methods. The data are interpreted in terms of a higher selectivity of the bivalent ions for the broken bonds located at the edges of the clay crystals. Using a model comprising two areas of different charge densities, the experimental differences in behavior can be predicted reasonably well.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Banin, A. and Ravikovitch, S. (1966) Kinetics of reactions in the conversion of Na- or Ca-saturated clay to H-Al clay: Clays and Clay Minerals, 14th Nat. Conf., pp. 193–204. Pergamon Press, Oxford.
Barrer, R. M., and Klinowski, J. (1972) Ion exchange involving several groups of homogeneous sites: J. chem. Soc. Faraday Trans. 68, 73–87.
Bolt, G. H., (1955) Ion adsorption by clays: Soil Sci. 79, 267–276.
Bolt, G. H., and Page, A. L., (1965) Ion-exchange equations based on double layer theory: Soil Sci. 99, 357–361.
Cremers, A. and Laudelout, H. (1965) Conductivité électrique des gels argimeus et anisométrie de leurs éléments: J. Chim. phys: 62, 1155–1162.
Eeckman, J. P., and Laudelout, H. (1961) Chemical stability of hydrogen montmorillonite suspensions: Kolloid Zh. 178, 99–107.
Eriksson, E. (1952) Cation-exchange equilibria in clay minerals: Soil Sci. 74, 103–113.
Foscolos A. E., and Barshad, I. (1969) Equilibrium constants between both freshly prepared and aged H monmoril-lonites and chloride salt solutions: Soit Sci. Soc. Am. Proc. 33, 242–247.
Gaines, G. L., and Thomas, H. C., (1953) Adsorption studies on clay minerals—II. A formulation of the thermodynamics of exchange adsorption: J. chem. Phys. 21, 714–718.
Gilbert, M. and Laudelout, H. (1965) Exchange properties of hydrogen ions in clays: Soil Sci. 100, 157–162.
Laudelout, H., Van Bladel, R., Bolt, G. H., and Page, A. L., (1968) Thermodynamics of heterovalent cation exchange reactions in amontmorillonite clay: Trans. Faraday Soc. 64, 1477–1488.
Lyklema, J. (1971) The electrical double layer on oxides. Croat, chem. Acta: 43, 249–260.
Pratt, P. F., Whittig, L. D., and Grover, B. L., (1962) Effect of pH on the sodium-calcium exchange equilibria in soils: Soil Sci. Soc. Am. Proc. 26, 227–230.
Shainberg, I. and Kemper, W. D., (1966) Electrostatic forces between clay and cations as calculated and inferred from electrical conductivity: Clays and Clay Minerals. 14th Nat. Conf., pp. 117–132. Pergamon Press, Oxford.
Van Bladel, R., Gaviria, G. and Laudelout H. (1972) A comparison of the thermodynamic, double layer theory and empirical studies of the Na-Ca exchange equilibria in clay-water systems: Proc. 4th. Int. Clay Conf., Vol. II, 15–30. Pergamon Press, Oxford.
Van Bladel, R. and Menzel, R. (1969) A thermodynamic study of sodium strontium exchange on Wyoming bentonite. Proc. 3rd Int. Clay Conf., Vol. I. 619–634. Pergamon Press, Oxford.
Weiss, A., Mekler, A., Koch, G. and Hofman, U. (1956) Uber das anionenaustauschverögen der Tonmineralen. Z. anorg. allg. Chem. 284, 247–271.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Peigneur, P., Maes, A. & Cremers, A. Heterogeneity of Charge Density Distribution in Montmorillonite as Inferred from Cobalt Adsorption. Clays Clay Miner. 23, 71–75 (1975). https://doi.org/10.1346/CCMN.1975.0230110
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1346/CCMN.1975.0230110