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Far infrared study of K+ , Rb+ and Cs+ during their exchange with Na+ and Ca2+ in vermiculite

Published online by Cambridge University Press:  09 July 2018

R. Badreddine ,
R. Le Dred  and
R. Prost
R. Badreddine
Affiliation:
Unité de Science du sol, INRA, Route de Saint Cyr, 78026 Versailles
R. Le Dred
Affiliation:
Laboratoire des Matériaux Minéraux, ENSCM, 3, rue Alfred Werner, 68093 Mulhouse, France
R. Prost*
Affiliation:
Unité de Science du sol, INRA, Route de Saint Cyr, 78026 Versailles
*
*E-mail: prost@versailles.inra.fr
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Abstract

All the exchange isotherms of Na+ or Ca2+ in vermiculite for K+, Rb+ or Cs+ show two kinds of exchanges sites: the first corresponds to sites located in phlogopite-like interlamellar spaces and the second to sites located in smectite-like interlamellar spaces. During the exchange, three mineralogical phases are formed: Na- or Ca-vermiculite; K-, Rb- or Cs-vermiculite and a mixed-layer phase. Far infrared absorption bands of K+, Rb+ and Cs+ located in the phlogopite-like interlamellar spaces are at 72, 59 and 53 cm–1, respectively. These frequencies are characteristic of a trioctahedral mixed-layer phase. Selectivity is greater for cations with a low hydration energy (K+, Rb+, Cs+) than for cations with a high hydration energy (Na+, Ca2+). On the other hand, for cations with a low hydration energy, structural parameters such as the tetrahedral rotation angle, α, have to be taken into account.

Keywords

b parameterscation exchangefar infrared spectroscopymixed-layer phaseselectivityvermiculitesX-ray diffraction
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 1 , March 2002 , pp. 71 - 81
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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