Structure and reactivity of synthetic Co-substituted goethites

Autores
Alvarez, Mariana; Sileo, Elsa Ester; Rueda, Elsa Haydee
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Fil: Alvarez, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Química; Argentina
Fil: Sileo, Elsa Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina
Fil: Rueda, Elsa Haydee. Universidad Nacional del Sur. Departamento de Química; Argentina
Materia
Acid Dissolution
Co-Goethite
Isomorphous Substitution
Rietveld Refinement
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/75482
Acceder
id CONICETDig_c4fe7ade98431f6e9dfd6fdfa464d63f
oai_identifier_str oai:ri.conicet.gov.ar:11336/75482
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Structure and reactivity of synthetic Co-substituted goethitesAlvarez, MarianaSileo, Elsa EsterRueda, Elsa HaydeeAcid DissolutionCo-GoethiteIsomorphous SubstitutionRietveld Refinementhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1A 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.Fil: Alvarez, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Química; ArgentinaFil: Sileo, Elsa Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; ArgentinaFil: Rueda, Elsa Haydee. Universidad Nacional del Sur. Departamento de Química; ArgentinaMineralogical Society of America2008-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/75482Alvarez, Mariana; Sileo, Elsa Ester; Rueda, Elsa Haydee; Structure and reactivity of synthetic Co-substituted goethites; Mineralogical Society of America; American Mineralogist; 93; 4; 4-2008; 584-5900003-004X1945-3027CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.2138/am.2008.2608info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/msa/ammin/article/93/4/584-590/44632info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:36:19Zoai:ri.conicet.gov.ar:11336/75482instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:36:19.756CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Structure and reactivity of synthetic Co-substituted goethites
title Structure and reactivity of synthetic Co-substituted goethites
spellingShingle Structure and reactivity of synthetic Co-substituted goethites
Alvarez, Mariana
Acid Dissolution
Co-Goethite
Isomorphous Substitution
Rietveld Refinement
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
dc.creator.none.fl_str_mv Alvarez, Mariana
Sileo, Elsa Ester
Rueda, Elsa Haydee
author Alvarez, Mariana
author_facet Alvarez, Mariana
Sileo, Elsa Ester
Rueda, Elsa Haydee
author_role author
author2 Sileo, Elsa Ester
Rueda, Elsa Haydee
author2_role author
author
dc.subject.none.fl_str_mv Acid Dissolution
Co-Goethite
Isomorphous Substitution
Rietveld Refinement
topic Acid Dissolution
Co-Goethite
Isomorphous Substitution
Rietveld Refinement
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 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.
Fil: Alvarez, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Química; Argentina
Fil: Sileo, Elsa Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina
Fil: Rueda, Elsa Haydee. Universidad Nacional del Sur. Departamento de Química; Argentina
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.
publishDate 2008
dc.date.none.fl_str_mv 2008-04
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/75482
Alvarez, Mariana; Sileo, Elsa Ester; Rueda, Elsa Haydee; Structure and reactivity of synthetic Co-substituted goethites; Mineralogical Society of America; American Mineralogist; 93; 4; 4-2008; 584-590
0003-004X
1945-3027
CONICET Digital
CONICET
url http://hdl.handle.net/11336/75482
identifier_str_mv Alvarez, Mariana; Sileo, Elsa Ester; Rueda, Elsa Haydee; Structure and reactivity of synthetic Co-substituted goethites; Mineralogical Society of America; American Mineralogist; 93; 4; 4-2008; 584-590
0003-004X
1945-3027
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.2138/am.2008.2608
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/msa/ammin/article/93/4/584-590/44632
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Mineralogical Society of America
publisher.none.fl_str_mv Mineralogical Society of America
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1844614383426076672
score 13.070432

Publicaciones similares