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Reduction of the Cation-Exchange Capacity of Montmorillonite by Take-Up of Hydroxy-Al Polymers

Published online by Cambridge University Press:  02 April 2024

R. Keren
R. Keren*
Affiliation:
Institute of Soils and Water, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
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Abstract

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The cation-exchange capacity (CEC) of Na-Al- and Ca-Al-montmorillonite after neutralization with NaOH or Ca(OH)2 was studied at three Al levels: 10, 25, and 50% of the CEC. Hydroxy-Al polymers were effective in reducing the CEC of Na-montmorillonite (by more than 46%), the exact effectiveness being dependent on the hydroxy-Al content. The hydroxy-Al polymers were less effective in reducing the CEC of Ca-montmorillonite (less than 26%). The CEC reduction was equal to or larger than the amount of the untitrated Al. The electrostatic charges of the clay which were blocked by the hydroxy-Al polymers were compensated for by both the positive charge of the hydroxy-Al polymers and the trapped cations on the clay surfaces. These cations remained on the clay even after extensive washing with 0.1 M KCl.

Keywords

Cation-exchange capacityHydroxy-Al polymerInterlayerMontmorilloniteSmectite
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 5 , October 1986 , pp. 534 - 538
Copyright
Copyright © 1986, The Clay Minerals Society

Footnotes

1

Contribution 1498-E, 1985 series from the Institute of Soils and Water, Agricultural Research Organization, The Volcani Center, Bet Dagan 50-250, Israel.

References

Bailey, G. W., White, J. L. and Rothberg, T., 1968 Adsorption of organic herbicides by montmorillonite: role of pH and chemical character of adsorbate Soil Sci. Soc. Amer. Proc. 32 222–234.CrossRefGoogle Scholar
Bamhisel, R. I. and Rich, C. I., 1963 Gibbsite formation from aluminum-interlayers in montmorillonite Soil Sci. Soc. Amer. Proc. 27 632–635.CrossRefGoogle Scholar
Coleman, N. T., Thomas, G. W., LeRoux, F. H. and Bredell, G., 1964 Salt exchangeable and titratable acidity in bentonite-sesquioxide mixtures Soil Sci. Soc. Amer. Proc. 28 35–37.CrossRefGoogle Scholar
Frink, C. R. and Sawhney, B. L., 1967 Neutralization of dilute aqueous aluminum salt solutions Soil Sci. 103 144–148.CrossRefGoogle Scholar
Gayer, K. H., Thompson, L. C. and Zajicek, O. T., 1958 The solubility of aluminum hydroxide in acidic and basic media at 25°C Can. J. Chem. 36 1268–1271.CrossRefGoogle Scholar
Hartley, G. S. and Roe, J. W., 1940 Ionic concentration at interfaces Trans. Faraday Soc. 36 101–109.CrossRefGoogle Scholar
Hsu, P. H., 1968 Heterogeneity of montmorillonite surface and its effect on the nature of hydroxy-aluminum interlayers Clays & Clay Minerals 16 303–311.CrossRefGoogle Scholar
Keren, R., 1979 The effect of hydroxy-aluminum precipitation on the exchange properties of montmorillonite Clays & Clay Minerals 27 303–304.CrossRefGoogle Scholar
Keren, R., 1980 Effects of titration rate, pH, and drying process on cation exchange capacity reduction and aggregate size distribution of montmorillonite hydroxy-aluminum complexes Soil Sci. Soc. Amer. J. 44 1209–1212.CrossRefGoogle Scholar
Keren, R., Gast, R. G. and Bamhisel, R. I., 1977 Ion exchange reactions in nondried chambers montmorillonite hydroxy-aluminum complexes Soil Sci. Soc. Amer. Proc. 41 34–39.CrossRefGoogle Scholar
Meyers, N. L., Ahlrichs, J. L. and Serratosa, J. M., 1973 Correlation of X-ray, IR, DTA, DTGA and CEC observation of Al-hydroxy interlayers Proc. Int. Clay Conf, Madrid, 1972 Madrid Div. Ciencias C.S.I.C. 549–559.Google Scholar
Parks, G. A., 1965 The isoelectric points of solid oxides, solid hydroxides, and aqueous hydroxo complex systems Chem. Rev. 65 177–198.CrossRefGoogle Scholar
Rich, C. I., 1968 Hydroxy interlayers in expansible layer silicates Clays & Clay Minerals 16 15–30.CrossRefGoogle Scholar
Shainberg, I. and Kaiserman, A., 1969 Kinetics of the formation and breakdown of Ca-montmorillonite tactoids Soil Sci. Soc. Amer. Proc. 33 547–551.CrossRefGoogle Scholar
Shainberg, I. and Otoh, H., 1968 Size and shape of montmorillonite particles saturated with Na/Ca ions Israel J. Chem. 6 251–259.CrossRefGoogle Scholar
Shen, M. J. and Rich, C. I., 1962 Aluminum fixation in montmorillonite Soil Sci. Soc. Amer. Proc. 26 33–36.CrossRefGoogle Scholar
Tullock, R. J. and Roth, C. B., 1975 Stability of mixed iron and aluminum hydrous oxides on montmorillonite Clays & Clay Minerals 23 27–32.CrossRefGoogle Scholar
Turner, R. C. and Brydon, J. E., 1967 Effect of length of time of reaction and some properties of suspensions of Arizona bentonite, illite, and kaolinite in which aluminum hydroxide is precipitated Soil Sci. 103 111–117.CrossRefGoogle Scholar
Turner, R. C. and Ross, G. J., 1969 Conditions in solution during the formation of gibbsite in dilute aluminum salt solutions Can. J. Soil Sci. 49 389–396.CrossRefGoogle Scholar