Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions

Autores
Alvarez, Mariana; Tufo, Ana Elisabeth; Zenobi, Maria Cristina; Ramos, Cinthia Paula; Sileo, Elsa Ester
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
To elucidate the influence of bi-substitution on the structural and hyperfine properties of goetites, two series of (Al,Co)- and (Mn,Co)-substituted goethites were synthesized in alkaline media by aging several ferrihydrites with different Al/Co and Mn/Co ratios. The samples were fully characterized by chemical analyses, X-ray diffraction (XRD) and Mössbauer spectroscopy; scanning electron microscopy (SEM), zeta potential and BET surface area measurements were also performed. All the solids presented only an α-FeOOH-like structure, with the exception of two preparations with high Co concentrations that developed two phases, goethite and small amounts of the Co-ferrite (CoFe2O4). The cell parameters in the Co-substituted goethites were markedly smaller than that of the pure sample indicating a oxidation of Co(II) to Co(III) before the incorporation step. In the Co+Mn series the metal substitution followed the trend Co~Mn, and in the Co+Al series the trend was Al>Co, and in both cases the incorporation of Co decreased the crystallite size of the samples. The metal-for-Fe incorporation changed the specific surface areas and the morphology of the acicular formed particles. Cobalt containing samples had the highest SSA, while Mn-containing samples had the lowest SSA. The IEP values of the bi-substituted samples were similar to that of pure α-FeOOH, but mono-substitution by Mn and Al diminished the isoelectric points. The low IEP values detected in Mn-goethite (5.8) and Al-goethite (5.2) could be respectively ascribed to an inhomogeneous distribution of Mn(III), and to the different basicity properties of the surface Fe-OH and Al-OH groups. The hyperfine magnetic field Bhf, increased quasi linearly with the incorporation of Co in both series. In the Co-Mn series the effect was attributed to variations in particle size distribution, in contrast the marked increase observed in the Co-Al series can be attributed to the decrease in the content of diamagnetic ion Al(III). The results indicate that simultaneous substitutions produce substantial changes in the structural, surface and hyperfine properties of goethites. As the characteristics of the dissolution and adsorption processes of the goethites greatly depend on particle size, BET areas and surface charge of the solids, the reported results will allow us to predict changes in the chemical reactivity and adsorption of the multi-substituted goethites. Also the data on hyperfine properties will help to elucidate the probable substitution in natural samples. The fact that Co-incorporation in bi-substituted samples greatly decreased the particle size increasing the specific surface area is an important parameter for technological applications in adsorption removal processes.
Fil: Alvarez, Mariana. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Buenos Aires, Argentina.
Fil: Tufo, Ana Elisabeth. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Buenos Aires, Argentina.
Fil: Zenobi, Maria Cristina. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Buenos Aires, Argentina.
Fil: Ramos, Cinthia Paula. Comisión Nacional de Energía Atómica; Buenos Aires, Argentina.
Fil: Sileo, Elsa Ester. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Buenos Aires, Argentina.
Fuente
Chemical Geology, 414: 16-27 (Oct 2015) Elsevier Science
https://doi.org/10.1016/j.chemgeo.2015.08.022
Materia
HYPERFINE PROPERTIES
MULTI-SUBSTITUCION
RIETVELD REFINEMENT
METEOROLOGÍA Y CIENCIAS ATMOSFÉRICAS
CIENCIAS NATURALES Y EXACTAS
Nivel de accesibilidad
acceso restringido
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
Repositorio Institucional (UNSAM)
Institución
Universidad Nacional de General San Martín
OAI Identificador
oai:ri.unsam.edu.ar:123456789/1010

id RIUNSAM_cf08885d85d18906eadb65de587ff87f
oai_identifier_str oai:ri.unsam.edu.ar:123456789/1010
network_acronym_str RIUNSAM
repository_id_str s
network_name_str Repositorio Institucional (UNSAM)
spelling Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ionsAlvarez, MarianaTufo, Ana ElisabethZenobi, Maria CristinaRamos, Cinthia PaulaSileo, Elsa EsterHYPERFINE PROPERTIESMULTI-SUBSTITUCIONRIETVELD REFINEMENTMETEOROLOGÍA Y CIENCIAS ATMOSFÉRICASCIENCIAS NATURALES Y EXACTASTo elucidate the influence of bi-substitution on the structural and hyperfine properties of goetites, two series of (Al,Co)- and (Mn,Co)-substituted goethites were synthesized in alkaline media by aging several ferrihydrites with different Al/Co and Mn/Co ratios. The samples were fully characterized by chemical analyses, X-ray diffraction (XRD) and Mössbauer spectroscopy; scanning electron microscopy (SEM), zeta potential and BET surface area measurements were also performed. All the solids presented only an α-FeOOH-like structure, with the exception of two preparations with high Co concentrations that developed two phases, goethite and small amounts of the Co-ferrite (CoFe2O4). The cell parameters in the Co-substituted goethites were markedly smaller than that of the pure sample indicating a oxidation of Co(II) to Co(III) before the incorporation step. In the Co+Mn series the metal substitution followed the trend Co~Mn, and in the Co+Al series the trend was Al>Co, and in both cases the incorporation of Co decreased the crystallite size of the samples. The metal-for-Fe incorporation changed the specific surface areas and the morphology of the acicular formed particles. Cobalt containing samples had the highest SSA, while Mn-containing samples had the lowest SSA. The IEP values of the bi-substituted samples were similar to that of pure α-FeOOH, but mono-substitution by Mn and Al diminished the isoelectric points. The low IEP values detected in Mn-goethite (5.8) and Al-goethite (5.2) could be respectively ascribed to an inhomogeneous distribution of Mn(III), and to the different basicity properties of the surface Fe-OH and Al-OH groups. The hyperfine magnetic field Bhf, increased quasi linearly with the incorporation of Co in both series. In the Co-Mn series the effect was attributed to variations in particle size distribution, in contrast the marked increase observed in the Co-Al series can be attributed to the decrease in the content of diamagnetic ion Al(III). The results indicate that simultaneous substitutions produce substantial changes in the structural, surface and hyperfine properties of goethites. As the characteristics of the dissolution and adsorption processes of the goethites greatly depend on particle size, BET areas and surface charge of the solids, the reported results will allow us to predict changes in the chemical reactivity and adsorption of the multi-substituted goethites. Also the data on hyperfine properties will help to elucidate the probable substitution in natural samples. The fact that Co-incorporation in bi-substituted samples greatly decreased the particle size increasing the specific surface area is an important parameter for technological applications in adsorption removal processes.Fil: Alvarez, Mariana. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Buenos Aires, Argentina.Fil: Tufo, Ana Elisabeth. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Buenos Aires, Argentina.Fil: Zenobi, Maria Cristina. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Buenos Aires, Argentina.Fil: Ramos, Cinthia Paula. Comisión Nacional de Energía Atómica; Buenos Aires, Argentina.Fil: Sileo, Elsa Ester. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Buenos Aires, Argentina.Elsevier Science2015-10info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfpp. 16-27application/pdfAlvarez, M. et al (oct 2015) Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions. En: Chemical Geology. Elsevier Science. 414, 16-270009-2541https://ri.unsam.edu.ar/handle/123456789/1010Chemical Geology, 414: 16-27 (Oct 2015) Elsevier Sciencehttps://doi.org/10.1016/j.chemgeo.2015.08.022reponame:Repositorio Institucional (UNSAM)instname:Universidad Nacional de General San Martínenginfo:eu-repo/semantics/restrictedAccesshttp://creativecommons.org/licenses/by-nc-sa/2.5/ar/Creative Commons Atribución-NoComercial-CompartirIgual 2.5 Argentina (CC BY-NC-SA 2.5)2025-09-29T14:30:20Zoai:ri.unsam.edu.ar:123456789/1010instacron:UNSAMInstitucionalhttp://ri.unsam.edu.arUniversidad públicaNo correspondehttp://ri.unsam.edu.ar/oai/lpastran@unsam.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:s2025-09-29 14:31:15.52Repositorio Institucional (UNSAM) - Universidad Nacional de General San Martínfalse
dc.title.none.fl_str_mv Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
spellingShingle Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
Alvarez, Mariana
HYPERFINE PROPERTIES
MULTI-SUBSTITUCION
RIETVELD REFINEMENT
METEOROLOGÍA Y CIENCIAS ATMOSFÉRICAS
CIENCIAS NATURALES Y EXACTAS
title_short Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title_full Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title_fullStr Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title_full_unstemmed Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title_sort Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
dc.creator.none.fl_str_mv Alvarez, Mariana
Tufo, Ana Elisabeth
Zenobi, Maria Cristina
Ramos, Cinthia Paula
Sileo, Elsa Ester
author Alvarez, Mariana
author_facet Alvarez, Mariana
Tufo, Ana Elisabeth
Zenobi, Maria Cristina
Ramos, Cinthia Paula
Sileo, Elsa Ester
author_role author
author2 Tufo, Ana Elisabeth
Zenobi, Maria Cristina
Ramos, Cinthia Paula
Sileo, Elsa Ester
author2_role author
author
author
author
dc.subject.none.fl_str_mv HYPERFINE PROPERTIES
MULTI-SUBSTITUCION
RIETVELD REFINEMENT
METEOROLOGÍA Y CIENCIAS ATMOSFÉRICAS
CIENCIAS NATURALES Y EXACTAS
topic HYPERFINE PROPERTIES
MULTI-SUBSTITUCION
RIETVELD REFINEMENT
METEOROLOGÍA Y CIENCIAS ATMOSFÉRICAS
CIENCIAS NATURALES Y EXACTAS
dc.description.none.fl_txt_mv To elucidate the influence of bi-substitution on the structural and hyperfine properties of goetites, two series of (Al,Co)- and (Mn,Co)-substituted goethites were synthesized in alkaline media by aging several ferrihydrites with different Al/Co and Mn/Co ratios. The samples were fully characterized by chemical analyses, X-ray diffraction (XRD) and Mössbauer spectroscopy; scanning electron microscopy (SEM), zeta potential and BET surface area measurements were also performed. All the solids presented only an α-FeOOH-like structure, with the exception of two preparations with high Co concentrations that developed two phases, goethite and small amounts of the Co-ferrite (CoFe2O4). The cell parameters in the Co-substituted goethites were markedly smaller than that of the pure sample indicating a oxidation of Co(II) to Co(III) before the incorporation step. In the Co+Mn series the metal substitution followed the trend Co~Mn, and in the Co+Al series the trend was Al>Co, and in both cases the incorporation of Co decreased the crystallite size of the samples. The metal-for-Fe incorporation changed the specific surface areas and the morphology of the acicular formed particles. Cobalt containing samples had the highest SSA, while Mn-containing samples had the lowest SSA. The IEP values of the bi-substituted samples were similar to that of pure α-FeOOH, but mono-substitution by Mn and Al diminished the isoelectric points. The low IEP values detected in Mn-goethite (5.8) and Al-goethite (5.2) could be respectively ascribed to an inhomogeneous distribution of Mn(III), and to the different basicity properties of the surface Fe-OH and Al-OH groups. The hyperfine magnetic field Bhf, increased quasi linearly with the incorporation of Co in both series. In the Co-Mn series the effect was attributed to variations in particle size distribution, in contrast the marked increase observed in the Co-Al series can be attributed to the decrease in the content of diamagnetic ion Al(III). The results indicate that simultaneous substitutions produce substantial changes in the structural, surface and hyperfine properties of goethites. As the characteristics of the dissolution and adsorption processes of the goethites greatly depend on particle size, BET areas and surface charge of the solids, the reported results will allow us to predict changes in the chemical reactivity and adsorption of the multi-substituted goethites. Also the data on hyperfine properties will help to elucidate the probable substitution in natural samples. The fact that Co-incorporation in bi-substituted samples greatly decreased the particle size increasing the specific surface area is an important parameter for technological applications in adsorption removal processes.
Fil: Alvarez, Mariana. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Buenos Aires, Argentina.
Fil: Tufo, Ana Elisabeth. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Buenos Aires, Argentina.
Fil: Zenobi, Maria Cristina. Universidad Nacional del Sur. Departamento de Química. Instituto de Química del Sur; Buenos Aires, Argentina.
Fil: Ramos, Cinthia Paula. Comisión Nacional de Energía Atómica; Buenos Aires, Argentina.
Fil: Sileo, Elsa Ester. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Buenos Aires, Argentina.
description To elucidate the influence of bi-substitution on the structural and hyperfine properties of goetites, two series of (Al,Co)- and (Mn,Co)-substituted goethites were synthesized in alkaline media by aging several ferrihydrites with different Al/Co and Mn/Co ratios. The samples were fully characterized by chemical analyses, X-ray diffraction (XRD) and Mössbauer spectroscopy; scanning electron microscopy (SEM), zeta potential and BET surface area measurements were also performed. All the solids presented only an α-FeOOH-like structure, with the exception of two preparations with high Co concentrations that developed two phases, goethite and small amounts of the Co-ferrite (CoFe2O4). The cell parameters in the Co-substituted goethites were markedly smaller than that of the pure sample indicating a oxidation of Co(II) to Co(III) before the incorporation step. In the Co+Mn series the metal substitution followed the trend Co~Mn, and in the Co+Al series the trend was Al>Co, and in both cases the incorporation of Co decreased the crystallite size of the samples. The metal-for-Fe incorporation changed the specific surface areas and the morphology of the acicular formed particles. Cobalt containing samples had the highest SSA, while Mn-containing samples had the lowest SSA. The IEP values of the bi-substituted samples were similar to that of pure α-FeOOH, but mono-substitution by Mn and Al diminished the isoelectric points. The low IEP values detected in Mn-goethite (5.8) and Al-goethite (5.2) could be respectively ascribed to an inhomogeneous distribution of Mn(III), and to the different basicity properties of the surface Fe-OH and Al-OH groups. The hyperfine magnetic field Bhf, increased quasi linearly with the incorporation of Co in both series. In the Co-Mn series the effect was attributed to variations in particle size distribution, in contrast the marked increase observed in the Co-Al series can be attributed to the decrease in the content of diamagnetic ion Al(III). The results indicate that simultaneous substitutions produce substantial changes in the structural, surface and hyperfine properties of goethites. As the characteristics of the dissolution and adsorption processes of the goethites greatly depend on particle size, BET areas and surface charge of the solids, the reported results will allow us to predict changes in the chemical reactivity and adsorption of the multi-substituted goethites. Also the data on hyperfine properties will help to elucidate the probable substitution in natural samples. The fact that Co-incorporation in bi-substituted samples greatly decreased the particle size increasing the specific surface area is an important parameter for technological applications in adsorption removal processes.
publishDate 2015
dc.date.none.fl_str_mv 2015-10
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
status_str publishedVersion
format article
dc.identifier.none.fl_str_mv Alvarez, M. et al (oct 2015) Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions. En: Chemical Geology. Elsevier Science. 414, 16-27
0009-2541
https://ri.unsam.edu.ar/handle/123456789/1010
identifier_str_mv Alvarez, M. et al (oct 2015) Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions. En: Chemical Geology. Elsevier Science. 414, 16-27
0009-2541
url https://ri.unsam.edu.ar/handle/123456789/1010
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/restrictedAccess
http://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Creative Commons Atribución-NoComercial-CompartirIgual 2.5 Argentina (CC BY-NC-SA 2.5)
eu_rights_str_mv restrictedAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Creative Commons Atribución-NoComercial-CompartirIgual 2.5 Argentina (CC BY-NC-SA 2.5)
dc.format.none.fl_str_mv application/pdf
pp. 16-27
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv Chemical Geology, 414: 16-27 (Oct 2015) Elsevier Science
https://doi.org/10.1016/j.chemgeo.2015.08.022
reponame:Repositorio Institucional (UNSAM)
instname:Universidad Nacional de General San Martín
reponame_str Repositorio Institucional (UNSAM)
collection Repositorio Institucional (UNSAM)
instname_str Universidad Nacional de General San Martín
repository.name.fl_str_mv Repositorio Institucional (UNSAM) - Universidad Nacional de General San Martín
repository.mail.fl_str_mv lpastran@unsam.edu.ar
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