Structure and reactivity of synthetic Co-substituted goethites

A set of synthetic goethites were prepared from Fe3+- and Co2+-nitrate solutions in alkaline media with a Co/(Co + Fe) ratio (xCo) up to 10 mol%. The structural characterization of the resultant solid phases was carried out by X-ray diffraction (XRD). XRD analyses showed that in preparations with xC...

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Autores principales: Alvarez, M., Sileo, E.E., Rueda, E.H.
Formato: JOUR
Materias:
Acid dissolution
Co-goethite
Isomorphous substitution
Rietveld refinement
chemical composition
cobalt
crystal chemistry
crystal structure
dissolution
goethite
nitrate
phase transition
Rietveld analysis
X-ray diffraction
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0003004X_v93_n4_p584_Alvarez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0003004X_v93_n4_p584_Alvarez
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spelling todo:paper_0003004X_v93_n4_p584_Alvarez2023-10-03T13:55:30Z Structure and reactivity of synthetic Co-substituted goethites Alvarez, M. Sileo, E.E. Rueda, E.H. Acid dissolution Co-goethite Isomorphous substitution Rietveld refinement chemical composition cobalt crystal chemistry crystal structure dissolution goethite nitrate phase transition Rietveld analysis X-ray diffraction A set of synthetic goethites were prepared from Fe3+- and Co2+-nitrate solutions in alkaline media with a Co/(Co + Fe) ratio (xCo) up to 10 mol%. The structural characterization of the resultant solid phases was carried out by X-ray diffraction (XRD). XRD analyses showed that in preparations with xCo <10 mol%, Co-substituted goethite was the only crystalline phase present. Atomic and cell parameters for the samples synthesized were obtained by the Rietveld refinement of the XRD data, and showed that the unit cell in the goethite-like phase is contracted as a function of xCo. Little deviation from the Vegard rule was observed for all unit-cell parameters. Cobalt substitution produces an increase in the surface area of the goethite, as well as an increment in the dehydroxylation temperature. The acid dissolution of all Co-goethites showed an increase in dissolution rate with the Co content, and a congruent behavior was observed. The activation energy for dissolution was obtained two samples. A modified first-order Kabai equation best describes the dissolution data. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0003004X_v93_n4_p584_Alvarez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Acid dissolution
Co-goethite
Isomorphous substitution
Rietveld refinement
chemical composition
cobalt
crystal chemistry
crystal structure
dissolution
goethite
nitrate
phase transition
Rietveld analysis
X-ray diffraction
spellingShingle Acid dissolution
Co-goethite
Isomorphous substitution
Rietveld refinement
chemical composition
cobalt
crystal chemistry
crystal structure
dissolution
goethite
nitrate
phase transition
Rietveld analysis
X-ray diffraction
Alvarez, M.
Sileo, E.E.
Rueda, E.H.
Structure and reactivity of synthetic Co-substituted goethites
topic_facet Acid dissolution
Co-goethite
Isomorphous substitution
Rietveld refinement
chemical composition
cobalt
crystal chemistry
crystal structure
dissolution
goethite
nitrate
phase transition
Rietveld analysis
X-ray diffraction
description A set of synthetic goethites were prepared from Fe3+- and Co2+-nitrate solutions in alkaline media with a Co/(Co + Fe) ratio (xCo) up to 10 mol%. The structural characterization of the resultant solid phases was carried out by X-ray diffraction (XRD). XRD analyses showed that in preparations with xCo <10 mol%, Co-substituted goethite was the only crystalline phase present. Atomic and cell parameters for the samples synthesized were obtained by the Rietveld refinement of the XRD data, and showed that the unit cell in the goethite-like phase is contracted as a function of xCo. Little deviation from the Vegard rule was observed for all unit-cell parameters. Cobalt substitution produces an increase in the surface area of the goethite, as well as an increment in the dehydroxylation temperature. The acid dissolution of all Co-goethites showed an increase in dissolution rate with the Co content, and a congruent behavior was observed. The activation energy for dissolution was obtained two samples. A modified first-order Kabai equation best describes the dissolution data.
format JOUR
author Alvarez, M.
Sileo, E.E.
Rueda, E.H.
author_facet Alvarez, M.
Sileo, E.E.
Rueda, E.H.
author_sort Alvarez, M.
title Structure and reactivity of synthetic Co-substituted goethites
title_short Structure and reactivity of synthetic Co-substituted goethites
title_full Structure and reactivity of synthetic Co-substituted goethites
title_fullStr Structure and reactivity of synthetic Co-substituted goethites
title_full_unstemmed Structure and reactivity of synthetic Co-substituted goethites
title_sort structure and reactivity of synthetic co-substituted goethites
url http://hdl.handle.net/20.500.12110/paper_0003004X_v93_n4_p584_Alvarez
work_keys_str_mv AT alvarezm structureandreactivityofsyntheticcosubstitutedgoethites
AT sileoee structureandreactivityofsyntheticcosubstitutedgoethites
AT ruedaeh structureandreactivityofsyntheticcosubstitutedgoethites
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