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Adsorption of Ethylenediamine (Eda) on Montmorillonite Saturated with Different Cations—IV: Al-, Ca- and Mg-Montmorillonite: Protonation, Ion-Exchange, Co-Ordination and Hydrogen-Bonding

Published online by Cambridge University Press:  01 July 2024

R. D. Laura  and
P. Cloos
R. D. Laura
Affiliation:
Laboratoire de Physico-Chimie Minérale, Place Croix du Sud 1, B-1348, Louvain-la-Neuve, Belgium
P. Cloos*
Affiliation:
Laboratoire de Physico-Chimie Minérale, Place Croix du Sud 1, B-1348, Louvain-la-Neuve, Belgium
*
*All correspondence should be addressed to Dr. P. Cloos. Laboratoire de Physico-Chimie Min6rale. Place Croix du Sud 1. B-1348 Louvain-la-Neuve. Belgium.
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Abstract

Ethylenediamine (EDA) adsorbed from aqueous solution or vapor phase on Al-, Ca- and Mg-montmorillonite was retained to a more or less large extent in protonated form. The NH+3:NH2 ratio decreased with the polarizing power of the mineral exchange cation (Al > Mg > Ca) and with increasing amounts of amine fixed. Excess EDA was adsorbed through hydrogen-bonding with protonated species, and partially through co-ordination in vapor treated samples. Co-ordination to the exchangeable cation seemed to be favored in the order Al > Mg < Ca, and the complexes were stable up to 200°C. Heating lowered the NH+3:NH2 ratio, indicating some deprotonation process caused probably by the competition for protons between EDA and hydrolysed exchange cations. This competition might also account for the rather low quantities of NH+4 produced near 200°C.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 5 , October 1975 , pp. 343 - 348
Copyright
Copyright © 1975, The Clay Minerals Society

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