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Preparation and characterization of iron oxide pillared montmorillonite

Published online by Cambridge University Press:  09 July 2018

D. H. Doff ,
N. H. J. Gangas ,
J. E. M. Allan  and
J. M. D. Coey
D. H. Doff
Affiliation:
Department of Geology, Trinity College, Dublin 2, Ireland
N. H. J. Gangas
Affiliation:
Kifissias Avenue 108, GR-11526 Athens, Greece
J. E. M. Allan
Affiliation:
Department of Pure and Applied Physics, Trinity College, Dublin 2, Ireland
J. M. D. Coey
Affiliation:
Department of Pure and Applied Physics, Trinity College, Dublin 2, Ireland
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Abstract

Pillared smectites in which the pillars consist of iron oxide are expected to have interesting and unusual magnetic properties. Several possible routes by which such materials might be made have been investigated, namely intercalation of hydroxy-Fe(III) polycations, mixed hydroxy-Fe(III)/Al polycations, phenanthroline-Fe(II) cations, and trinuclear Fe(III) acetato cations into Na-montmorillonite. Only the last of these yielded a pillared clay (PILC) on calcination. The products have been characterized using X-ray powder diffraction and 57Fe Mössbauer spectroscopy. The precursor Fe-PILC has a d-spacing of 21 Å and expands to 23 Å on solvation with glycol. The calcined Fe-PILC has a d-spacing of 19 Å (gallery height 9·4 Å) and does not expand with glycol, confirming cross-linking of the layers. From Mössbauer spectra at 4·2 K it is estimated that there are of the order of some hundred Fe atoms per pillar.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 4 , December 1988 , pp. 367 - 377
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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