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Adsorption of Ethylenediamine (EDA) on Montmorillonite Saturated with Different Cations—V. Ammonium- and Triethylammonium-Montmorillonite Ion-Exchange, Protonation and Hydrogen-Bonding

Published online by Cambridge University Press:  01 July 2024

P. Cloos ,
R. D. Laura  and
C. Badot
P. Cloos
Affiliation:
Laboratoire de Physico-Chimie Minérale, Place Croix du Sud 1, B-1348, Louvain-la-Neuve, Belgium
R. D. Laura
Affiliation:
Laboratoire de Physico-Chimie Minérale, Place Croix du Sud 1, B-1348, Louvain-la-Neuve, Belgium
C. Badot
Affiliation:
Laboratoire de Physico-Chimie Minérale, Place Croix du Sud 1, B-1348, Louvain-la-Neuve, Belgium
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Abstract

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On NH4- as well as on (C2H5)3NH-montmorillonite EDA was adsorbed in protonated form. The extent of protonation depended on the relative basicities and concentrations of the interacting compounds. In the systems exposed to EDA vapor a proton transfer process took place. A similar mechanism, involving probably a water molecule which remained associated with the EDAH+ ion, occurred on air-drying (C2H5)3NH-montmorillonite treated with aqueous EDA, whereas no adsorption was observed when the suspension was washed. On the contrary EDA added, in quantities not exceeding the CEC, to a suspension of NH4-montmorillonite was adsorbed almost exclusively as EDAH22+ ion. This is explained in terms of ion-exchange between NH4+ and EDAH+ present in aqueous medium and protonation of the second amine function through the dissociation of water molecules near the clay surface.

Hydrogen-bonding between protonated and neutral EDA was observed when the extent of adsorption was higher than the extent of protonation.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 6 , December 1975 , pp. 417 - 423
Copyright
Copyright © 1975, The Clay Minerals Society

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