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Magnetic Titanium-Pillared Clays (Ti-M-PILC): Magnetic Studies and Mössbauer Spectroscopy

Published online by Cambridge University Press:  01 January 2024

Cherifa Bachir ,
Yanhua Lan ,
Valeriu Mereacre ,
Annie K. Powell ,
Christian Bender Koch  and
Peter G. Weidler
Cherifa Bachir*
Affiliation:
Institute of Functional Interfaces, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany Department of Industrial Chemistry, Faculty of Sciences, B.P. 1505 EL-Mnaouer, University of Sciences and Technologies USTO ‘Mohamed Boudiaf’, Oran, Algeria
Yanhua Lan
Affiliation:
Institute for Inorganic Chemistry, University of Karlsruhe (TH), Engesserstr. 15 Geb. 30.45, D-76131 Karlsruhe, Germany
Valeriu Mereacre
Affiliation:
Institute for Inorganic Chemistry, University of Karlsruhe (TH), Engesserstr. 15 Geb. 30.45, D-76131 Karlsruhe, Germany
Annie K. Powell
Affiliation:
Institute for Inorganic Chemistry, University of Karlsruhe (TH), Engesserstr. 15 Geb. 30.45, D-76131 Karlsruhe, Germany
Christian Bender Koch
Affiliation:
Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg, Denmark
Peter G. Weidler
Affiliation:
Institute of Functional Interfaces, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
*
* E-mail address of corresponding author: Cherifa.Bachir@ifg.fzk.de, bachir_c04@yahoo.fr, peter.weidler@ifg.fzk.de
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Abstract

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Pillared clays (PILCs) with magnetic properties are materials with potential for wide application in industry and the environment, but only a few studies of these types of materials have been carried out. The purpose of this study was to advance knowledge of the preparation and magnetic properties of pillared clays by examining in detail a series of magnetic Ti-pillared clays (Ti-M-PILCs). Samples were synthesized at ambient temperature by sodium borohydride reduction of ferrous ions added by ion-exchange to Ti-pillared montmorillonite (Ti-PILCs). The properties of the Ti-M-PILCs were investigated using a superconducting quantum interference device (SQUID) and Mössbauer spectroscopy. Hysteresis, zero-field-cooled (ZFC), and field-cooled (FC) regimes were measured on different precursor materials prepared by calcination of Ti-PILCs at temperatures between 200 and 600°C. Hysteresis loops, recorded between −7 and 7 T in the temperature range 200–300 K, were observed in most samples depending on the preparation of clays. The ZFC/FC measurements were made after heating from 2 to 300 Kunder an applied magnetic field of 39.8 kA m−1. The influence of the calcination temperature of the starting Ti-PILCs on the structural and magnetic properties of the Ti-M-PILCs was examined. The presence of two different Fe-alloy distributions was found; a dispersed one for the less-calcined Ti-PILCs and clusters for the more-calcined ones.

Keywords

Magnetic PropertiesMontmorilloniteMössbauer SpectroscopyTitanium Magnetic Pillared ClaysZFC/FC
Type
Research Article
Information
Clays and Clay Minerals , Volume 57 , Issue 4 , August 2009 , pp. 433 - 443
Copyright
Copyright © The Clay Minerals Society 2009

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