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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.

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