Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides
- Autores
- Rojas Delgado, Ricardo; de Pauli, Carlos Primo; Barriga Carrasco, C; Avena, Marcelo Javier
- Año de publicación
- 2008
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Zn-Al layered double hydroxides with different MII/MIII ratios were synthesized by the coprecipitation method and the obtained solids were characterized by powder X-ray diffraction, infrared spectroscopy, acid-base potentiometric titrations, electrophoretic mobility and modeling of the electrical double layer. As general behavior, increasing hydroxyl adsorption with increasing pH and decreasing supporting electrolyte concentration takes place between pH 7 and 12. The electrophoretic mobility of the samples are in all cases positive and it decreases when the pH becomes higher than 9. A net positive charge of the particles, with a point of zero charge (PZC) around 11.8, is deduced from electrophoretic data. A modified MUSIC model, where OH-/Cl- exchange at structural sites and proton desorption from surface hydroxyl groups are taken into account, is used to estimate the deprotonation constants, the number of surface groups, the number of sites with structural charges an the affinity constants for Cl- and OH- of the samples with different MII/MIII ratios. The modeling of potentiometric titrations and electrophoresis data indicates that anions between the layers and negatively charged groups in the particle surface balance most of the structural charge at the particles surface. It shows an important variation of the number of structural sites with the MII/MIII ratio and an important role of surface protonation-deprotonation sites to the electrical behavior and exchange properties of LDHs. © 2007 Elsevier B.V. All rights reserved.
Fil: Rojas Delgado, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: de Pauli, Carlos Primo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Barriga Carrasco, C. Universidad de Córdoba; España
Fil: Avena, Marcelo Javier. Universidad Nacional del Sur. Departamento de Química; Argentina - Materia
-
Acid-Base Potentiometric Titrations
Electric Double Layer
Electrophoretic Mobilities
Layered Double Hydroxides - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/66053
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Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxidesRojas Delgado, Ricardode Pauli, Carlos PrimoBarriga Carrasco, CAvena, Marcelo JavierAcid-Base Potentiometric TitrationsElectric Double LayerElectrophoretic MobilitiesLayered Double Hydroxideshttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Zn-Al layered double hydroxides with different MII/MIII ratios were synthesized by the coprecipitation method and the obtained solids were characterized by powder X-ray diffraction, infrared spectroscopy, acid-base potentiometric titrations, electrophoretic mobility and modeling of the electrical double layer. As general behavior, increasing hydroxyl adsorption with increasing pH and decreasing supporting electrolyte concentration takes place between pH 7 and 12. The electrophoretic mobility of the samples are in all cases positive and it decreases when the pH becomes higher than 9. A net positive charge of the particles, with a point of zero charge (PZC) around 11.8, is deduced from electrophoretic data. A modified MUSIC model, where OH-/Cl- exchange at structural sites and proton desorption from surface hydroxyl groups are taken into account, is used to estimate the deprotonation constants, the number of surface groups, the number of sites with structural charges an the affinity constants for Cl- and OH- of the samples with different MII/MIII ratios. The modeling of potentiometric titrations and electrophoresis data indicates that anions between the layers and negatively charged groups in the particle surface balance most of the structural charge at the particles surface. It shows an important variation of the number of structural sites with the MII/MIII ratio and an important role of surface protonation-deprotonation sites to the electrical behavior and exchange properties of LDHs. © 2007 Elsevier B.V. All rights reserved.Fil: Rojas Delgado, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: de Pauli, Carlos Primo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Barriga Carrasco, C. Universidad de Córdoba; EspañaFil: Avena, Marcelo Javier. Universidad Nacional del Sur. Departamento de Química; ArgentinaElsevier Science2008-12info: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/11336/66053Rojas Delgado, Ricardo; de Pauli, Carlos Primo; Barriga Carrasco, C; Avena, Marcelo Javier; Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides; Elsevier Science; Applied Clay Science; 40; 1-4; 12-2008; 27-370169-1317CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169131707001342info:eu-repo/semantics/altIdentifier/doi/10.1016/j.clay.2007.06.010info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:18:57Zoai:ri.conicet.gov.ar:11336/66053instacron: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 10:18:57.633CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides |
title |
Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides |
spellingShingle |
Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides Rojas Delgado, Ricardo Acid-Base Potentiometric Titrations Electric Double Layer Electrophoretic Mobilities Layered Double Hydroxides |
title_short |
Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides |
title_full |
Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides |
title_fullStr |
Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides |
title_full_unstemmed |
Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides |
title_sort |
Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides |
dc.creator.none.fl_str_mv |
Rojas Delgado, Ricardo de Pauli, Carlos Primo Barriga Carrasco, C Avena, Marcelo Javier |
author |
Rojas Delgado, Ricardo |
author_facet |
Rojas Delgado, Ricardo de Pauli, Carlos Primo Barriga Carrasco, C Avena, Marcelo Javier |
author_role |
author |
author2 |
de Pauli, Carlos Primo Barriga Carrasco, C Avena, Marcelo Javier |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Acid-Base Potentiometric Titrations Electric Double Layer Electrophoretic Mobilities Layered Double Hydroxides |
topic |
Acid-Base Potentiometric Titrations Electric Double Layer Electrophoretic Mobilities Layered Double Hydroxides |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Zn-Al layered double hydroxides with different MII/MIII ratios were synthesized by the coprecipitation method and the obtained solids were characterized by powder X-ray diffraction, infrared spectroscopy, acid-base potentiometric titrations, electrophoretic mobility and modeling of the electrical double layer. As general behavior, increasing hydroxyl adsorption with increasing pH and decreasing supporting electrolyte concentration takes place between pH 7 and 12. The electrophoretic mobility of the samples are in all cases positive and it decreases when the pH becomes higher than 9. A net positive charge of the particles, with a point of zero charge (PZC) around 11.8, is deduced from electrophoretic data. A modified MUSIC model, where OH-/Cl- exchange at structural sites and proton desorption from surface hydroxyl groups are taken into account, is used to estimate the deprotonation constants, the number of surface groups, the number of sites with structural charges an the affinity constants for Cl- and OH- of the samples with different MII/MIII ratios. The modeling of potentiometric titrations and electrophoresis data indicates that anions between the layers and negatively charged groups in the particle surface balance most of the structural charge at the particles surface. It shows an important variation of the number of structural sites with the MII/MIII ratio and an important role of surface protonation-deprotonation sites to the electrical behavior and exchange properties of LDHs. © 2007 Elsevier B.V. All rights reserved. Fil: Rojas Delgado, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: de Pauli, Carlos Primo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Barriga Carrasco, C. Universidad de Córdoba; España Fil: Avena, Marcelo Javier. Universidad Nacional del Sur. Departamento de Química; Argentina |
description |
Zn-Al layered double hydroxides with different MII/MIII ratios were synthesized by the coprecipitation method and the obtained solids were characterized by powder X-ray diffraction, infrared spectroscopy, acid-base potentiometric titrations, electrophoretic mobility and modeling of the electrical double layer. As general behavior, increasing hydroxyl adsorption with increasing pH and decreasing supporting electrolyte concentration takes place between pH 7 and 12. The electrophoretic mobility of the samples are in all cases positive and it decreases when the pH becomes higher than 9. A net positive charge of the particles, with a point of zero charge (PZC) around 11.8, is deduced from electrophoretic data. A modified MUSIC model, where OH-/Cl- exchange at structural sites and proton desorption from surface hydroxyl groups are taken into account, is used to estimate the deprotonation constants, the number of surface groups, the number of sites with structural charges an the affinity constants for Cl- and OH- of the samples with different MII/MIII ratios. The modeling of potentiometric titrations and electrophoresis data indicates that anions between the layers and negatively charged groups in the particle surface balance most of the structural charge at the particles surface. It shows an important variation of the number of structural sites with the MII/MIII ratio and an important role of surface protonation-deprotonation sites to the electrical behavior and exchange properties of LDHs. © 2007 Elsevier B.V. All rights reserved. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-12 |
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/11336/66053 Rojas Delgado, Ricardo; de Pauli, Carlos Primo; Barriga Carrasco, C; Avena, Marcelo Javier; Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides; Elsevier Science; Applied Clay Science; 40; 1-4; 12-2008; 27-37 0169-1317 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/66053 |
identifier_str_mv |
Rojas Delgado, Ricardo; de Pauli, Carlos Primo; Barriga Carrasco, C; Avena, Marcelo Javier; Influence of MII/MIII ratio in surface-charging behavior of Zn-Al layered double hydroxides; Elsevier Science; Applied Clay Science; 40; 1-4; 12-2008; 27-37 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/url/https://www.sciencedirect.com/science/article/pii/S0169131707001342 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.clay.2007.06.010 |
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 |
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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1844614156799442944 |
score |
13.070432 |