Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides

Autores
Jobbagy, Matias; Blesa, Miguel Angel; Regazzoni, Alberto Ernesto
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
An adequate account of the hydrolytic properties of Cr3+ and Ni2+ allows setting the conditions for homogeneous nucleation of layered Ni(II)–Cr(III) double hydroxides; water exchange and hydrolysis rate constants indicate that, at very high rates of base dosing, formation of heteronuclear Cr(III)–Ni(II) hydroxo species should prevail over precipitation of active Cr(OH)3. This is realized by the urea method under microwave-assisted hydrothermal conditions. This approach yields crystalline Ni1−xCrx(OH)2(CO3)x/2·nH2O (x ≈ 0.32–0.36) in less than 5 min at 453 K; higher degrees of crystallinity are obtained at higher temperatures and/or longer aging times. Formation of Ni(II)–Cr(III) LDHs upon microwave-assisted hydrothermal aging of freshly coprecipitated Ni(OH)2+Cr(OH)3 mixtures takes longer, due to a different operating mechanism. The implications of the advanced rationale for the design of synthesis procedures are stressed. It is proposed that homogeneous nucleation of Ni(II)–Cr(III) LDHs involves the edge-on condensation of planar heteronuclear Cr(III)–Ni(II) hydroxo trimers. Ordered aggregation of primary particles leads to the final platelet crystals, a process that involves the exchange of CO32− ions dangling at the crystallites’ edges by bridging OH−.
Fil: Jobbagy, Matias. 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: Blesa, Miguel Angel. Universidad Nacional de San Martín; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Regazzoni, Alberto Ernesto. Universidad Nacional de San Martín. Instituto Sabato; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina
Materia
Layered double hydroxides
Hydrotalcites
Homogeneous precipitation
Nickel hydroxide
Chromium hydroxide
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:11336/102966
Acceder
id CONICETDig_cacb7b3709e4b211373249e58467d915
oai_identifier_str oai:ri.conicet.gov.ar:11336/102966
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxidesJobbagy, MatiasBlesa, Miguel AngelRegazzoni, Alberto ErnestoLayered double hydroxidesHydrotalcitesHomogeneous precipitationNickel hydroxideChromium hydroxidehttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1An adequate account of the hydrolytic properties of Cr3+ and Ni2+ allows setting the conditions for homogeneous nucleation of layered Ni(II)–Cr(III) double hydroxides; water exchange and hydrolysis rate constants indicate that, at very high rates of base dosing, formation of heteronuclear Cr(III)–Ni(II) hydroxo species should prevail over precipitation of active Cr(OH)3. This is realized by the urea method under microwave-assisted hydrothermal conditions. This approach yields crystalline Ni1−xCrx(OH)2(CO3)x/2·nH2O (x ≈ 0.32–0.36) in less than 5 min at 453 K; higher degrees of crystallinity are obtained at higher temperatures and/or longer aging times. Formation of Ni(II)–Cr(III) LDHs upon microwave-assisted hydrothermal aging of freshly coprecipitated Ni(OH)2+Cr(OH)3 mixtures takes longer, due to a different operating mechanism. The implications of the advanced rationale for the design of synthesis procedures are stressed. It is proposed that homogeneous nucleation of Ni(II)–Cr(III) LDHs involves the edge-on condensation of planar heteronuclear Cr(III)–Ni(II) hydroxo trimers. Ordered aggregation of primary particles leads to the final platelet crystals, a process that involves the exchange of CO32− ions dangling at the crystallites’ edges by bridging OH−.Fil: Jobbagy, Matias. 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: Blesa, Miguel Angel. Universidad Nacional de San Martín; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Regazzoni, Alberto Ernesto. Universidad Nacional de San Martín. Instituto Sabato; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; ArgentinaAcademic Press Inc Elsevier Science2007-05info: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/11336/102966Jobbagy, Matias; Blesa, Miguel Angel; Regazzoni, Alberto Ernesto; Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides; Academic Press Inc Elsevier Science; Journal of Colloid and Interface Science; 309; 1; 5-2007; 72-770021-9797CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0021979707000343info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jcis.2007.01.010info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:04:16Zoai:ri.conicet.gov.ar:11336/102966instacron: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 10:04:16.801CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides
title Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides
spellingShingle Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides
Jobbagy, Matias
Layered double hydroxides
Hydrotalcites
Homogeneous precipitation
Nickel hydroxide
Chromium hydroxide
title_short Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides
title_full Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides
title_fullStr Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides
title_full_unstemmed Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides
title_sort Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides
dc.creator.none.fl_str_mv Jobbagy, Matias
Blesa, Miguel Angel
Regazzoni, Alberto Ernesto
author Jobbagy, Matias
author_facet Jobbagy, Matias
Blesa, Miguel Angel
Regazzoni, Alberto Ernesto
author_role author
author2 Blesa, Miguel Angel
Regazzoni, Alberto Ernesto
author2_role author
author
dc.subject.none.fl_str_mv Layered double hydroxides
Hydrotalcites
Homogeneous precipitation
Nickel hydroxide
Chromium hydroxide
topic Layered double hydroxides
Hydrotalcites
Homogeneous precipitation
Nickel hydroxide
Chromium hydroxide
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv An adequate account of the hydrolytic properties of Cr3+ and Ni2+ allows setting the conditions for homogeneous nucleation of layered Ni(II)–Cr(III) double hydroxides; water exchange and hydrolysis rate constants indicate that, at very high rates of base dosing, formation of heteronuclear Cr(III)–Ni(II) hydroxo species should prevail over precipitation of active Cr(OH)3. This is realized by the urea method under microwave-assisted hydrothermal conditions. This approach yields crystalline Ni1−xCrx(OH)2(CO3)x/2·nH2O (x ≈ 0.32–0.36) in less than 5 min at 453 K; higher degrees of crystallinity are obtained at higher temperatures and/or longer aging times. Formation of Ni(II)–Cr(III) LDHs upon microwave-assisted hydrothermal aging of freshly coprecipitated Ni(OH)2+Cr(OH)3 mixtures takes longer, due to a different operating mechanism. The implications of the advanced rationale for the design of synthesis procedures are stressed. It is proposed that homogeneous nucleation of Ni(II)–Cr(III) LDHs involves the edge-on condensation of planar heteronuclear Cr(III)–Ni(II) hydroxo trimers. Ordered aggregation of primary particles leads to the final platelet crystals, a process that involves the exchange of CO32− ions dangling at the crystallites’ edges by bridging OH−.
Fil: Jobbagy, Matias. 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: Blesa, Miguel Angel. Universidad Nacional de San Martín; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Regazzoni, Alberto Ernesto. Universidad Nacional de San Martín. Instituto Sabato; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Constituyentes; Argentina
description An adequate account of the hydrolytic properties of Cr3+ and Ni2+ allows setting the conditions for homogeneous nucleation of layered Ni(II)–Cr(III) double hydroxides; water exchange and hydrolysis rate constants indicate that, at very high rates of base dosing, formation of heteronuclear Cr(III)–Ni(II) hydroxo species should prevail over precipitation of active Cr(OH)3. This is realized by the urea method under microwave-assisted hydrothermal conditions. This approach yields crystalline Ni1−xCrx(OH)2(CO3)x/2·nH2O (x ≈ 0.32–0.36) in less than 5 min at 453 K; higher degrees of crystallinity are obtained at higher temperatures and/or longer aging times. Formation of Ni(II)–Cr(III) LDHs upon microwave-assisted hydrothermal aging of freshly coprecipitated Ni(OH)2+Cr(OH)3 mixtures takes longer, due to a different operating mechanism. The implications of the advanced rationale for the design of synthesis procedures are stressed. It is proposed that homogeneous nucleation of Ni(II)–Cr(III) LDHs involves the edge-on condensation of planar heteronuclear Cr(III)–Ni(II) hydroxo trimers. Ordered aggregation of primary particles leads to the final platelet crystals, a process that involves the exchange of CO32− ions dangling at the crystallites’ edges by bridging OH−.
publishDate 2007
dc.date.none.fl_str_mv 2007-05
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/11336/102966
Jobbagy, Matias; Blesa, Miguel Angel; Regazzoni, Alberto Ernesto; Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides; Academic Press Inc Elsevier Science; Journal of Colloid and Interface Science; 309; 1; 5-2007; 72-77
0021-9797
CONICET Digital
CONICET
url http://hdl.handle.net/11336/102966
identifier_str_mv Jobbagy, Matias; Blesa, Miguel Angel; Regazzoni, Alberto Ernesto; Homogeneous precipitation of layered Ni(II)–Cr(III) double hydroxides; Academic Press Inc Elsevier Science; Journal of Colloid and Interface Science; 309; 1; 5-2007; 72-77
0021-9797
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://www.sciencedirect.com/science/article/abs/pii/S0021979707000343
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jcis.2007.01.010
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 Academic Press Inc Elsevier Science
publisher.none.fl_str_mv Academic Press Inc 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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