Effect of Cd(II) on the ripening of ferrihydrite in alkaline media

Autores
Alvarez, Mariana; Horst, María Fernanda; Sileo, Elsa Ester; Rueda, Elsa Haydee
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
To acquire a better understanding of the influence exerted by the presence of Cd + during the process of transforming ferrihydrite to goethite, the morphological and structural changes of several samples obtained by the addition of Cd + to a suspension of nascent goethite were explored, and their chemical reactivity in acid media assessed. The samples (series Gi) were obtained by adding, at different times during the synthesis process, Cd 2+ ions to ferrihydrite (Fe5HO 8 .4H 2 O) formed in alkaline media. The suspensions were aged for 5 days at 70°C, and the amorphous materials were extracted using a HCl solution (series G HCl-i ). The X-ray diffraction (XRD) patterns showed that a goethite-like phase was formed, and chemical analyses indicated that the Cd content, x Cd , increased with the earlier addition of the Cd + ions to the Fe oxyhydroxide suspension. Lattice parameters and cell volume, obtained by the Rietveld simulation of XRD data, indicated an enlargement of the cell parameters of goethite in line with the Cd-for-Fe substitution. In order to determine the influence of oxalate ions on the non-extracted solids, a second set of samples was also prepared that was kept in contact with an ammonium oxalate solution for 4 h (series G ox-i ). The dissolution behavior of two series of Cdgoethites and of a third series, obtained from coprecipitation of Fe + and Cd + ions in alkaline media, was observed. Kinetics measurements in 4 M HCl showed that the initial dissolution rate of samples G ox-i decreased with aging time, while the opposite effect was observed for series G HCl-i . Dissolution-time curves were well described by the Kabai equation, and activation energies were calculated using the Arrhenius equation. The results indicate that the presence of Cd during the crystallization process of goethite leads to the formation of a Cd goethite with modified morphology, structural parameters, and chemical reactivity.
Fil: Alvarez, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Argentina
Fil: Horst, María Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; 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. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Argentina
Materia
Acid Reactivity
Aging
Cadmium Incorporation
Goethite
Hcl Extraction
Oxalate Extraction
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:11336/78334
Acceder
id CONICETDig_d9299c9c1cc3a5606c34c1979e313106
oai_identifier_str oai:ri.conicet.gov.ar:11336/78334
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Effect of Cd(II) on the ripening of ferrihydrite in alkaline mediaAlvarez, MarianaHorst, María FernandaSileo, Elsa EsterRueda, Elsa HaydeeAcid ReactivityAgingCadmium IncorporationGoethiteHcl ExtractionOxalate Extractionhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1To acquire a better understanding of the influence exerted by the presence of Cd + during the process of transforming ferrihydrite to goethite, the morphological and structural changes of several samples obtained by the addition of Cd + to a suspension of nascent goethite were explored, and their chemical reactivity in acid media assessed. The samples (series Gi) were obtained by adding, at different times during the synthesis process, Cd 2+ ions to ferrihydrite (Fe5HO 8 .4H 2 O) formed in alkaline media. The suspensions were aged for 5 days at 70°C, and the amorphous materials were extracted using a HCl solution (series G HCl-i ). The X-ray diffraction (XRD) patterns showed that a goethite-like phase was formed, and chemical analyses indicated that the Cd content, x Cd , increased with the earlier addition of the Cd + ions to the Fe oxyhydroxide suspension. Lattice parameters and cell volume, obtained by the Rietveld simulation of XRD data, indicated an enlargement of the cell parameters of goethite in line with the Cd-for-Fe substitution. In order to determine the influence of oxalate ions on the non-extracted solids, a second set of samples was also prepared that was kept in contact with an ammonium oxalate solution for 4 h (series G ox-i ). The dissolution behavior of two series of Cdgoethites and of a third series, obtained from coprecipitation of Fe + and Cd + ions in alkaline media, was observed. Kinetics measurements in 4 M HCl showed that the initial dissolution rate of samples G ox-i decreased with aging time, while the opposite effect was observed for series G HCl-i . Dissolution-time curves were well described by the Kabai equation, and activation energies were calculated using the Arrhenius equation. The results indicate that the presence of Cd during the crystallization process of goethite leads to the formation of a Cd goethite with modified morphology, structural parameters, and chemical reactivity.Fil: Alvarez, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; ArgentinaFil: Horst, María Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; 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. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; ArgentinaClay Minerals Society2012-04info: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/11336/78334Alvarez, Mariana; Horst, María Fernanda; Sileo, Elsa Ester; Rueda, Elsa Haydee; Effect of Cd(II) on the ripening of ferrihydrite in alkaline media; Clay Minerals Society; Clays and Clay Minerals; 60; 2; 4-2012; 99-1070009-86041552-8367CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1346%2FCCMN.2012.0600201info:eu-repo/semantics/altIdentifier/doi/10.1346/CCMN.2012.0600201info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/ccm/article/60/2/99/48769/EFFECT-OF-Cd-II-ON-THE-RIPENING-OF-FERRIHYDRITE-INinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:48:34Zoai:ri.conicet.gov.ar:11336/78334instacron: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:34982025-10-15 14:48:35.258CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effect of Cd(II) on the ripening of ferrihydrite in alkaline media
title Effect of Cd(II) on the ripening of ferrihydrite in alkaline media
spellingShingle Effect of Cd(II) on the ripening of ferrihydrite in alkaline media
Alvarez, Mariana
Acid Reactivity
Aging
Cadmium Incorporation
Goethite
Hcl Extraction
Oxalate Extraction
title_short Effect of Cd(II) on the ripening of ferrihydrite in alkaline media
title_full Effect of Cd(II) on the ripening of ferrihydrite in alkaline media
title_fullStr Effect of Cd(II) on the ripening of ferrihydrite in alkaline media
title_full_unstemmed Effect of Cd(II) on the ripening of ferrihydrite in alkaline media
title_sort Effect of Cd(II) on the ripening of ferrihydrite in alkaline media
dc.creator.none.fl_str_mv Alvarez, Mariana
Horst, María Fernanda
Sileo, Elsa Ester
Rueda, Elsa Haydee
author Alvarez, Mariana
author_facet Alvarez, Mariana
Horst, María Fernanda
Sileo, Elsa Ester
Rueda, Elsa Haydee
author_role author
author2 Horst, María Fernanda
Sileo, Elsa Ester
Rueda, Elsa Haydee
author2_role author
author
author
dc.subject.none.fl_str_mv Acid Reactivity
Aging
Cadmium Incorporation
Goethite
Hcl Extraction
Oxalate Extraction
topic Acid Reactivity
Aging
Cadmium Incorporation
Goethite
Hcl Extraction
Oxalate Extraction
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv To acquire a better understanding of the influence exerted by the presence of Cd + during the process of transforming ferrihydrite to goethite, the morphological and structural changes of several samples obtained by the addition of Cd + to a suspension of nascent goethite were explored, and their chemical reactivity in acid media assessed. The samples (series Gi) were obtained by adding, at different times during the synthesis process, Cd 2+ ions to ferrihydrite (Fe5HO 8 .4H 2 O) formed in alkaline media. The suspensions were aged for 5 days at 70°C, and the amorphous materials were extracted using a HCl solution (series G HCl-i ). The X-ray diffraction (XRD) patterns showed that a goethite-like phase was formed, and chemical analyses indicated that the Cd content, x Cd , increased with the earlier addition of the Cd + ions to the Fe oxyhydroxide suspension. Lattice parameters and cell volume, obtained by the Rietveld simulation of XRD data, indicated an enlargement of the cell parameters of goethite in line with the Cd-for-Fe substitution. In order to determine the influence of oxalate ions on the non-extracted solids, a second set of samples was also prepared that was kept in contact with an ammonium oxalate solution for 4 h (series G ox-i ). The dissolution behavior of two series of Cdgoethites and of a third series, obtained from coprecipitation of Fe + and Cd + ions in alkaline media, was observed. Kinetics measurements in 4 M HCl showed that the initial dissolution rate of samples G ox-i decreased with aging time, while the opposite effect was observed for series G HCl-i . Dissolution-time curves were well described by the Kabai equation, and activation energies were calculated using the Arrhenius equation. The results indicate that the presence of Cd during the crystallization process of goethite leads to the formation of a Cd goethite with modified morphology, structural parameters, and chemical reactivity.
Fil: Alvarez, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Argentina
Fil: Horst, María Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; 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. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Química del Sur. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Argentina
description To acquire a better understanding of the influence exerted by the presence of Cd + during the process of transforming ferrihydrite to goethite, the morphological and structural changes of several samples obtained by the addition of Cd + to a suspension of nascent goethite were explored, and their chemical reactivity in acid media assessed. The samples (series Gi) were obtained by adding, at different times during the synthesis process, Cd 2+ ions to ferrihydrite (Fe5HO 8 .4H 2 O) formed in alkaline media. The suspensions were aged for 5 days at 70°C, and the amorphous materials were extracted using a HCl solution (series G HCl-i ). The X-ray diffraction (XRD) patterns showed that a goethite-like phase was formed, and chemical analyses indicated that the Cd content, x Cd , increased with the earlier addition of the Cd + ions to the Fe oxyhydroxide suspension. Lattice parameters and cell volume, obtained by the Rietveld simulation of XRD data, indicated an enlargement of the cell parameters of goethite in line with the Cd-for-Fe substitution. In order to determine the influence of oxalate ions on the non-extracted solids, a second set of samples was also prepared that was kept in contact with an ammonium oxalate solution for 4 h (series G ox-i ). The dissolution behavior of two series of Cdgoethites and of a third series, obtained from coprecipitation of Fe + and Cd + ions in alkaline media, was observed. Kinetics measurements in 4 M HCl showed that the initial dissolution rate of samples G ox-i decreased with aging time, while the opposite effect was observed for series G HCl-i . Dissolution-time curves were well described by the Kabai equation, and activation energies were calculated using the Arrhenius equation. The results indicate that the presence of Cd during the crystallization process of goethite leads to the formation of a Cd goethite with modified morphology, structural parameters, and chemical reactivity.
publishDate 2012
dc.date.none.fl_str_mv 2012-04
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/11336/78334
Alvarez, Mariana; Horst, María Fernanda; Sileo, Elsa Ester; Rueda, Elsa Haydee; Effect of Cd(II) on the ripening of ferrihydrite in alkaline media; Clay Minerals Society; Clays and Clay Minerals; 60; 2; 4-2012; 99-107
0009-8604
1552-8367
CONICET Digital
CONICET
url http://hdl.handle.net/11336/78334
identifier_str_mv Alvarez, Mariana; Horst, María Fernanda; Sileo, Elsa Ester; Rueda, Elsa Haydee; Effect of Cd(II) on the ripening of ferrihydrite in alkaline media; Clay Minerals Society; Clays and Clay Minerals; 60; 2; 4-2012; 99-107
0009-8604
1552-8367
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1346%2FCCMN.2012.0600201
info:eu-repo/semantics/altIdentifier/doi/10.1346/CCMN.2012.0600201
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/ccm/article/60/2/99/48769/EFFECT-OF-Cd-II-ON-THE-RIPENING-OF-FERRIHYDRITE-IN
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 Clay Minerals Society
publisher.none.fl_str_mv Clay Minerals Society
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
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score 13.22299

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