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A Kinetic Survey of the Cation Exchange and of the Oxidation of a Vermiculite

Published online by Cambridge University Press:  01 July 2024

G. Besson ,
H. Estrade ,
L. Gatineau ,
C. Tchoubar  and
J. Mering
G. Besson
Affiliation:
Laboratoire de Cristallographie, Faculté des sciences, Orleans, France Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, C.N.R.S., Orleans, France
H. Estrade
Affiliation:
Laboratoire de Cristallographie, Faculté des sciences, Orleans, France Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, C.N.R.S., Orleans, France
L. Gatineau
Affiliation:
Laboratoire de Cristallographie, Faculté des sciences, Orleans, France Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, C.N.R.S., Orleans, France
C. Tchoubar
Affiliation:
Laboratoire de Cristallographie, Faculté des sciences, Orleans, France Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, C.N.R.S., Orleans, France
J. Mering
Affiliation:
Laboratoire de Cristallographie, Faculté des sciences, Orleans, France Centre de Recherche sur les Solides à Organisation Cristalline Imparfaite, C.N.R.S., Orleans, France
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Abstract

With the use of a BaCl2 solution containing radioactive Ba2+ ions, kinetics of cation exchange have been done on a Kenya vermiculite, natural on one hand and previously oxidized either by 50°C water or oxygenated water on the other hand. Correlatively, the quantity of ferric iron in the layer has been determined by E.P.R. These two methods have shown that during an oxidation the proportion of iron which stays in the octahedral layer depends upon the nature of the oxidizing agent. During a weak oxidation, the iron stays entirely in an octahedral layer and the exchange capacity of the vermiculite decreases; on the other hand, during an oxidation by oxygenated water, part of the iron is extracted from the octahedral layer and the exchange capacity of the vermiculite is not changed, as established by the studies of Farmer (Farmer et al., 1971). Kinetic data for Llano vermiculite also are reported and compared with those for the Kenya vermiculite.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 4 , August 1975 , pp. 318 - 322
Copyright
Copyright © 1975, The Clay Minerals Society

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Footnotes

⧾

Deceased.

References

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