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Redox Treatment of an Fe/Al Pillared Montmorillonite. A Mössbauer Study

Published online by Cambridge University Press:  28 February 2024

T. Bakas ,
A. Moukarika ,
V. Papaefthymiou  and
A. Ladavos
T. Bakas*
Affiliation:
Physics Department, The University of Ioannina, GR 451 10 Ioannina, Greece
A. Moukarika
Affiliation:
Physics Department, The University of Ioannina, GR 451 10 Ioannina, Greece
V. Papaefthymiou
Affiliation:
Physics Department, The University of Ioannina, GR 451 10 Ioannina, Greece
A. Ladavos
Affiliation:
Chemistry Department, The University of Ioannina, GR 451 10 Ioannina, Greece
*
*Address correspondence to T. Bakas.
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Abstract

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Pillared structures with an interlayer opening of ∼0.3 nm were obtained after successive heat treatments of the PILC precursor in reducing and oxidizing conditions. This precursor was prepared by reacting a Na+-montmorillonite with an intercalant containing Al and Fe oxo-hydroxides (Al/Fe = 1). Powder X-ray diffraction, elemental analysis, 57Fe Mössbauer spectroscopy, catalytic activity measurements and surface area data were used to characterize the samples. On the basis of Mössbauer spectra taken at temperatures between 4.2 and 300 K, it is deduced that oxidizing steps produce Al substituted maghemite which converts into Al substituted magnetite upon reducing heat treatment. Firing the precursor in oxidizing atmosphere forms pillars of few nm in diameter. However, heating under reducing conditions yields pillars of smaller diameter. This later behaviour is maintained even after reheating the material in oxidizing atmosphere. From the temperature dependence of Mössbauer spectra it is deduced that the diameter of the Fe oxide particles in the pillars is smaller than 10 nm.

Keywords

LepidocrociteMaghemiteMagnetiteModified montmorilloniteMössbauerPILCSuperparamagnetism
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 5 , October 1994 , pp. 634 - 642
Copyright
Copyright © 1994, Clay Minerals Society

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