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A far infrared study of K+ ions during K+ ⇋ Ca2+ exchange 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 AlfredWerner, 68093 Mulhouse, France
R. Prost*
Affiliation:
Unité de Science du Sol, INRA, Route de Saint Cyr, 78026 Versailles
*
*E-mail: [email protected]
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Abstract

K+ ⇋ Ca2+ exchange was performed on a mixed-layer (phlogopite-vermiculite) sample from Palabora, Republic of South Africa. Exchange isotherms, X-ray diffraction patterns and far infrared (FIR) spectra of the mineral were obtained. Different mineralogical phases were identified during the exchange process: K-vermiculite, Ca-vermiculite and a regular mixed-layer (VK–VCa) phase. Two types of exchange sites for K+ were identified by FIR during the exchange process. The first type, dominant in the K-vermiculite, gives an absorption band at 76 cm–1. The other, which was the most pronounced site in the mixed-layer phase, gives an absorption band at 72 cm–1. The mixed-layer phase was formed only when oxidation of Fe2+ resulted in the internal compensation of part of the negative charge of vermiculite. This study shows that the high selectivity displayed by vermiculite for K+ is enhanced by the formation of the mixed-layer phase.

Keywords

exchange isothermsFIR spectroscopyselectivityvermiculiteX-ray diffraction
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 1 , March 2002 , pp. 59 - 70
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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