Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition

Autores
Tufo, Ana Elisabeth; Sileo, Elsa Ester; Morando, Pedro Juan
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The dissolution mechanism of pure and Cr-substituted, synthetic goethites with different aging times, as well as the changes in morphology, crystallinity and structural changes, were investigated. The Cr-goethites were obtained by synthesizing goethite in solutions that contained different concentrations of Cr(III) ions. The obtained suspensions were aged in the parent solutions for different time spans. Two samples of pure goethites, prepared using different KOH concentrations, were also studied for comparative purposes. Chemical analyses showed that Cr-for-Fe substitution was greatest in samples aged for longer time. Rietveld simulation of XRD powder data indicated that the unit cell parameters of pure goethite increased for samples prepared at a higher KOH concentration, and decreased with Cr-incorporation. Simulation also showed that the mean coherence path dimension (MCP), or crystallite size, in the direction perpendicular to crystal plane (110), did not change much in the samples, whereas the crystallite size in the direction parallel to crystal plane (110) increased with Cr-content, KOH concentration and aging time. The obtained MCP values indicate an increasing elongated form in the domains. Chromium substituted goethites presented a good capacity for immobilizating Cr when the dissolution rates were studied in 3.98M HCl, 0.10M oxalic acid (H 2Oxal), and reductive media (H 2Oxal/Fe(II)). The shape of the f vs. t profile, where f stands for the fraction of Fe dissolved (dissolved Fe mass/total Fe mass) and t refers to the dissolution time, follows a contracting bidimensional model, and when dissolved in similar acid concentrations, the reactivity follows the trend HCl
Fil: Tufo, Ana Elisabeth. 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: 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: Morando, Pedro Juan. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Instituto Sabato; Argentina
Materia
Acid Dissolution
Cr-Goethite
Crystallite Size
Lattice Parameters
Reductive Dissolution
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:11336/67860
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/67860
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and compositionTufo, Ana ElisabethSileo, Elsa EsterMorando, Pedro JuanAcid DissolutionCr-GoethiteCrystallite SizeLattice ParametersReductive Dissolutionhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The dissolution mechanism of pure and Cr-substituted, synthetic goethites with different aging times, as well as the changes in morphology, crystallinity and structural changes, were investigated. The Cr-goethites were obtained by synthesizing goethite in solutions that contained different concentrations of Cr(III) ions. The obtained suspensions were aged in the parent solutions for different time spans. Two samples of pure goethites, prepared using different KOH concentrations, were also studied for comparative purposes. Chemical analyses showed that Cr-for-Fe substitution was greatest in samples aged for longer time. Rietveld simulation of XRD powder data indicated that the unit cell parameters of pure goethite increased for samples prepared at a higher KOH concentration, and decreased with Cr-incorporation. Simulation also showed that the mean coherence path dimension (MCP), or crystallite size, in the direction perpendicular to crystal plane (110), did not change much in the samples, whereas the crystallite size in the direction parallel to crystal plane (110) increased with Cr-content, KOH concentration and aging time. The obtained MCP values indicate an increasing elongated form in the domains. Chromium substituted goethites presented a good capacity for immobilizating Cr when the dissolution rates were studied in 3.98M HCl, 0.10M oxalic acid (H 2Oxal), and reductive media (H 2Oxal/Fe(II)). The shape of the f vs. t profile, where f stands for the fraction of Fe dissolved (dissolved Fe mass/total Fe mass) and t refers to the dissolution time, follows a contracting bidimensional model, and when dissolved in similar acid concentrations, the reactivity follows the trend HClFil: Tufo, Ana Elisabeth. 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: 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: Morando, Pedro Juan. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Instituto Sabato; ArgentinaElsevier Science2012-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/67860Tufo, Ana Elisabeth; Sileo, Elsa Ester; Morando, Pedro Juan; Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition; Elsevier Science; Applied Clay Science; 58; 4-2012; 88-950169-1317CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.clay.2012.01.018info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169131712000415info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:50:29Zoai:ri.conicet.gov.ar:11336/67860instacron: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:34982025-09-03 09:50:30.272CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition
title Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition
spellingShingle Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition
Tufo, Ana Elisabeth
Acid Dissolution
Cr-Goethite
Crystallite Size
Lattice Parameters
Reductive Dissolution
title_short Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition
title_full Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition
title_fullStr Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition
title_full_unstemmed Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition
title_sort Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition
dc.creator.none.fl_str_mv Tufo, Ana Elisabeth
Sileo, Elsa Ester
Morando, Pedro Juan
author Tufo, Ana Elisabeth
author_facet Tufo, Ana Elisabeth
Sileo, Elsa Ester
Morando, Pedro Juan
author_role author
author2 Sileo, Elsa Ester
Morando, Pedro Juan
author2_role author
author
dc.subject.none.fl_str_mv Acid Dissolution
Cr-Goethite
Crystallite Size
Lattice Parameters
Reductive Dissolution
topic Acid Dissolution
Cr-Goethite
Crystallite Size
Lattice Parameters
Reductive Dissolution
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The dissolution mechanism of pure and Cr-substituted, synthetic goethites with different aging times, as well as the changes in morphology, crystallinity and structural changes, were investigated. The Cr-goethites were obtained by synthesizing goethite in solutions that contained different concentrations of Cr(III) ions. The obtained suspensions were aged in the parent solutions for different time spans. Two samples of pure goethites, prepared using different KOH concentrations, were also studied for comparative purposes. Chemical analyses showed that Cr-for-Fe substitution was greatest in samples aged for longer time. Rietveld simulation of XRD powder data indicated that the unit cell parameters of pure goethite increased for samples prepared at a higher KOH concentration, and decreased with Cr-incorporation. Simulation also showed that the mean coherence path dimension (MCP), or crystallite size, in the direction perpendicular to crystal plane (110), did not change much in the samples, whereas the crystallite size in the direction parallel to crystal plane (110) increased with Cr-content, KOH concentration and aging time. The obtained MCP values indicate an increasing elongated form in the domains. Chromium substituted goethites presented a good capacity for immobilizating Cr when the dissolution rates were studied in 3.98M HCl, 0.10M oxalic acid (H 2Oxal), and reductive media (H 2Oxal/Fe(II)). The shape of the f vs. t profile, where f stands for the fraction of Fe dissolved (dissolved Fe mass/total Fe mass) and t refers to the dissolution time, follows a contracting bidimensional model, and when dissolved in similar acid concentrations, the reactivity follows the trend HCl
Fil: Tufo, Ana Elisabeth. 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: 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: Morando, Pedro Juan. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Universidad Nacional de San Martín. Instituto Sabato; Argentina
description The dissolution mechanism of pure and Cr-substituted, synthetic goethites with different aging times, as well as the changes in morphology, crystallinity and structural changes, were investigated. The Cr-goethites were obtained by synthesizing goethite in solutions that contained different concentrations of Cr(III) ions. The obtained suspensions were aged in the parent solutions for different time spans. Two samples of pure goethites, prepared using different KOH concentrations, were also studied for comparative purposes. Chemical analyses showed that Cr-for-Fe substitution was greatest in samples aged for longer time. Rietveld simulation of XRD powder data indicated that the unit cell parameters of pure goethite increased for samples prepared at a higher KOH concentration, and decreased with Cr-incorporation. Simulation also showed that the mean coherence path dimension (MCP), or crystallite size, in the direction perpendicular to crystal plane (110), did not change much in the samples, whereas the crystallite size in the direction parallel to crystal plane (110) increased with Cr-content, KOH concentration and aging time. The obtained MCP values indicate an increasing elongated form in the domains. Chromium substituted goethites presented a good capacity for immobilizating Cr when the dissolution rates were studied in 3.98M HCl, 0.10M oxalic acid (H 2Oxal), and reductive media (H 2Oxal/Fe(II)). The shape of the f vs. t profile, where f stands for the fraction of Fe dissolved (dissolved Fe mass/total Fe mass) and t refers to the dissolution time, follows a contracting bidimensional model, and when dissolved in similar acid concentrations, the reactivity follows the trend HCl
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/11336/67860
Tufo, Ana Elisabeth; Sileo, Elsa Ester; Morando, Pedro Juan; Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition; Elsevier Science; Applied Clay Science; 58; 4-2012; 88-95
0169-1317
CONICET Digital
CONICET
url http://hdl.handle.net/11336/67860
identifier_str_mv Tufo, Ana Elisabeth; Sileo, Elsa Ester; Morando, Pedro Juan; Release of metals from synthetic Cr-goethites under acidic and reductive conditions: Effect of aging and composition; Elsevier Science; Applied Clay Science; 58; 4-2012; 88-95
0169-1317
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.clay.2012.01.018
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169131712000415
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
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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 13.13397

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