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Preparation and Characterization of Magnetic Composites Based on a Natural Zeolite

Published online by Cambridge University Press:  01 January 2024

Marlen Gutiérrez ,
Mauricio Escudey ,
Juan Escrig ,
Juliano C. Denardin ,
Dora Altbir ,
Jose D. Fabris ,
Luis C. D. Cavalcante  and
María Teresa García-González
Marlen Gutiérrez*
Affiliation:
Universidad de Santiago de Chile, Av. B. O’Higgins 3363, 9170022 Santiago, Chile Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124, Santiago, Chile
Mauricio Escudey
Affiliation:
Universidad de Santiago de Chile, Av. B. O’Higgins 3363, 9170022 Santiago, Chile Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124, Santiago, Chile
Juan Escrig
Affiliation:
Universidad de Santiago de Chile, Av. B. O’Higgins 3363, 9170022 Santiago, Chile Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124, Santiago, Chile
Juliano C. Denardin
Affiliation:
Universidad de Santiago de Chile, Av. B. O’Higgins 3363, 9170022 Santiago, Chile Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124, Santiago, Chile
Dora Altbir
Affiliation:
Universidad de Santiago de Chile, Av. B. O’Higgins 3363, 9170022 Santiago, Chile Center for the Development of Nanoscience and Nanotechnology, CEDENNA, 9170124, Santiago, Chile
Jose D. Fabris
Affiliation:
Departmento de Quı´mica, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Minas Gerais, Brazil
Luis C. D. Cavalcante
Affiliation:
Departmento de Quı´mica, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Minas Gerais, Brazil
María Teresa García-González
Affiliation:
Instituto de Ciencias Agrarias, Centro de Ciencias Medioambientales, Consejo Superior de Investigaciones Científicas, Calle Serrano 115, 28006 Madrid, Spain
*
* E-mail address of corresponding author: [email protected]
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Abstract

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A magnetic composite was prepared by wet-impregnating a powder of a natural zeolite with a magnetic Fe oxide-containing synthetic material. Both starting materials were first characterized with X-ray diffraction, scanning electron microscopy, Mössbauer spectroscopy, and by isoelectric-point using vibrating-sample magnetometry. The synthetic Fe oxide-containing material was characterized as a mixture of magnetite (Fe3O4) and goethite (α-FeOOH). From the Fe Mössbauer analysis, the relative subspectral area for magnetite corresponds to 93(2)%; the remaining spectrum is assignable to goethite. After the impregnation process, magnetite was still identified in the composite material as a magnetic layer surrounding the zeolite particles; no magnetically ordered goethite could be detected. The Mössbauer pattern for this sample indicates a much more complex structure than for the precursor material, based on Fe oxides, with some more altered magnetite and an intense central doublet of (super)paramagnetic Fe3+, probably due to small Fe (hydr)oxides and/or to a residual contribution of Fe-bearing species from the starting zeolite material. The composite preparation procedure also promoted the change of the characteristic A-type zeolite to mordenite. The resulting magnetic composite presented a magnetic coercivity of as much as 0.140 A m−1, at 77 K. The final composite is now being evaluated as an adsorbent: results to date confirm that this novel magnetic material may have applications in the remediation of contaminated water bodies.

Keywords

CoercivityFe OxideIsoelectric PointMagnetiteMagnetic ZeoliteMössbauer Spectroscopy
Type
Article
Information
Clays and Clay Minerals , Volume 58 , Issue 5 , October 2010 , pp. 589 - 595
Copyright
Copyright © Clay Minerals Society 2010

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