Preparation and characterization of magnetic composites based on a natural zeolite
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 57Fe 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.
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Clay Minerals Society
2010-10
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Subjects: | Coercivity, Fe OxideIsoelectric Point, Magnetic Zeolite, Magnetite, Mössbauer Spectroscopy, |
Online Access: | http://hdl.handle.net/10261/198407 |
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dig-ica-es-10261-1984072022-04-13T09:38:55Z Preparation and characterization of magnetic composites based on a natural zeolite Gutiérrez, M. Escudey, Mauricio Escrig, J. Denardin, Juliano C. Altbir, Dora Fabris, J. D. Cavalcante, L. C. D. García-González, M. T. Coercivity Fe OxideIsoelectric Point Magnetic Zeolite Magnetite Mössbauer Spectroscopy 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 57Fe 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. 2020-01-21T08:25:40Z 2020-01-21T08:25:40Z 2010-10 2020-01-21T08:25:41Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1346/CCMN.2010.0580501 issn: 0009-8604 issn: 1552-8367 Clays and Clay Minerals 58(5): 589-595 (2010) http://hdl.handle.net/10261/198407 10.1346/CCMN.2010.0580501 http://dx.doi.org/10.1346/CCMN.2010.0580501 Sí none Clay Minerals Society |
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Coercivity Fe OxideIsoelectric Point Magnetic Zeolite Magnetite Mössbauer Spectroscopy Coercivity Fe OxideIsoelectric Point Magnetic Zeolite Magnetite Mössbauer Spectroscopy |
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Coercivity Fe OxideIsoelectric Point Magnetic Zeolite Magnetite Mössbauer Spectroscopy Coercivity Fe OxideIsoelectric Point Magnetic Zeolite Magnetite Mössbauer Spectroscopy Gutiérrez, M. Escudey, Mauricio Escrig, J. Denardin, Juliano C. Altbir, Dora Fabris, J. D. Cavalcante, L. C. D. García-González, M. T. Preparation and characterization of magnetic composites based on a natural zeolite |
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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 57Fe 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. |
format |
artículo |
topic_facet |
Coercivity Fe OxideIsoelectric Point Magnetic Zeolite Magnetite Mössbauer Spectroscopy |
author |
Gutiérrez, M. Escudey, Mauricio Escrig, J. Denardin, Juliano C. Altbir, Dora Fabris, J. D. Cavalcante, L. C. D. García-González, M. T. |
author_facet |
Gutiérrez, M. Escudey, Mauricio Escrig, J. Denardin, Juliano C. Altbir, Dora Fabris, J. D. Cavalcante, L. C. D. García-González, M. T. |
author_sort |
Gutiérrez, M. |
title |
Preparation and characterization of magnetic composites based on a natural zeolite |
title_short |
Preparation and characterization of magnetic composites based on a natural zeolite |
title_full |
Preparation and characterization of magnetic composites based on a natural zeolite |
title_fullStr |
Preparation and characterization of magnetic composites based on a natural zeolite |
title_full_unstemmed |
Preparation and characterization of magnetic composites based on a natural zeolite |
title_sort |
preparation and characterization of magnetic composites based on a natural zeolite |
publisher |
Clay Minerals Society |
publishDate |
2010-10 |
url |
http://hdl.handle.net/10261/198407 |
work_keys_str_mv |
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_version_ |
1777663683887890432 |