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Fe-rich smectites from Gafsa (Tunisia): characterization and pillaring behaviour

Published online by Cambridge University Press:  09 July 2018

S. Letaïef ,
B. Casal ,
N. Kbir-ariguib ,
M. Trabelsi–Ayadi  and
E. Ruiz-hitzky
S. Letaïef
Affiliation:
L.P.C.M. Faculté des Sciences de Bizerte, Zarzouna Bizerte, Tunisia Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain
B. Casal
Affiliation:
Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain
N. Kbir-ariguib
Affiliation:
Institut Nationale de la Recherche Scientifique et Technique, Borj-Cédria, 2050 Hammam-Lif, Tunisia
M. Trabelsi–Ayadi
Affiliation:
L.P.C.M. Faculté des Sciences de Bizerte, Zarzouna Bizerte, Tunisia
E. Ruiz-hitzky*
Affiliation:
Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain
*
*E-mail: [email protected]
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Abstract

Three raw samples of Fe-rich smectites from Gafsa (Jebels Shemsi and Hammadi, Tunisia) have been characterized by different techniques which indicate that they contain (15 – 20%) illite, probably interstratified and to a lesser extent they also contain kaolinite, calcite, quartz and Fe oxides. These samples present a relatively high Fe content (∼9%) in the <2 μm fraction. From EPR and Mössbauer spectroscopy it is deduced that Fe is mainly present as Fe(III) in the octahedral environment of smectites and also in Fe-oxyhydroxides associated with the clays. Aluminium-pillared clays have been prepared from the Na+-purified samples, and their thermal stability and acidity have been studied.

Keywords

Fe-rich smectitebentonitepillared claysEPRMössbauerIR
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 3 , September 2002 , pp. 517 - 529
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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