Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface

Autores
Antelo, Juan; Avena, Marcelo Javier; Fiol, Sarah; López, Rocío; Arce, Florencio
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The surface properties of a well-crystallized synthetic goethite have been studied by acid-base potentiometric titrations, electrophoresis, and phosphate and arsenate adsorption isotherms at different pH and electrolyte concentrations. The PZC and IEP of the studied goethite were 9.3±0.1 and 9.3±0.2, respectively. Phosphate and arsenate adsorption decrease as the pH increases in either 0.1 or 0.01 M KNO3 solutions. Phosphate adsorption is more sensitive to changes in pH and ionic strength than that of arsenate. The combined effects of pH and ionic strength result in higher phosphate adsorption in acidic media at most ionic strengths, but result in lower phosphate adsorption in basic media and low ionic strengths. The CD-MUSIC model yields rather good fit of the experimental data. For phosphate it was necessary to postulate the presence of three inner-sphere surface complexes (monodentate nonprotonated, bidentate nonprotonated, and bidentate protonated). In contrast, arsenate could be well described by postulating only the presence of the two bidenate species. A small improvement of the arsenate adsorption data could be achieved by assuming the presence of a monodentate protonated species. Model predictions are in agreement with spectroscopic evidence, which suggest, especially for the case of arsenate, that mainly bidentate inner-sphere complexes are formed at the goethite-water interface.
Fil: Antelo, Juan. Universidad de Santiago de Compostela; España
Fil: Avena, Marcelo Javier. 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: Fiol, Sarah. Universidad de Santiago de Compostela; España
Fil: López, Rocío. Universidad de Santiago de Compostela; España
Fil: Arce, Florencio. Universidad de Santiago de Compostela; España
Materia
ARSENATE ADSORPTION
CD-MUSIC MODEL
ELECTROPHORETIC MOBILITIES
OXIDE-WATER INTERFACE
PHOSPHATE ADSORPTION
SURFACE CHARGE
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:11336/95168
Acceder
id CONICETDig_0a3cf42e03c86835195d93e60e82a521
oai_identifier_str oai:ri.conicet.gov.ar:11336/95168
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interfaceAntelo, JuanAvena, Marcelo JavierFiol, SarahLópez, RocíoArce, FlorencioARSENATE ADSORPTIONCD-MUSIC MODELELECTROPHORETIC MOBILITIESOXIDE-WATER INTERFACEPHOSPHATE ADSORPTIONSURFACE CHARGEhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The surface properties of a well-crystallized synthetic goethite have been studied by acid-base potentiometric titrations, electrophoresis, and phosphate and arsenate adsorption isotherms at different pH and electrolyte concentrations. The PZC and IEP of the studied goethite were 9.3±0.1 and 9.3±0.2, respectively. Phosphate and arsenate adsorption decrease as the pH increases in either 0.1 or 0.01 M KNO3 solutions. Phosphate adsorption is more sensitive to changes in pH and ionic strength than that of arsenate. The combined effects of pH and ionic strength result in higher phosphate adsorption in acidic media at most ionic strengths, but result in lower phosphate adsorption in basic media and low ionic strengths. The CD-MUSIC model yields rather good fit of the experimental data. For phosphate it was necessary to postulate the presence of three inner-sphere surface complexes (monodentate nonprotonated, bidentate nonprotonated, and bidentate protonated). In contrast, arsenate could be well described by postulating only the presence of the two bidenate species. A small improvement of the arsenate adsorption data could be achieved by assuming the presence of a monodentate protonated species. Model predictions are in agreement with spectroscopic evidence, which suggest, especially for the case of arsenate, that mainly bidentate inner-sphere complexes are formed at the goethite-water interface.Fil: Antelo, Juan. Universidad de Santiago de Compostela; EspañaFil: Avena, Marcelo Javier. 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: Fiol, Sarah. Universidad de Santiago de Compostela; EspañaFil: López, Rocío. Universidad de Santiago de Compostela; EspañaFil: Arce, Florencio. Universidad de Santiago de Compostela; EspañaAcademic Press Inc Elsevier Science2005-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/95168Antelo, Juan; Avena, Marcelo Javier; Fiol, Sarah; López, Rocío; Arce, Florencio; Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface; Academic Press Inc Elsevier Science; Journal of Colloid and Interface Science; 285; 2; 5-2005; 476-4860021-9797CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0021979704012354info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jcis.2004.12.032info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:08:34Zoai:ri.conicet.gov.ar:11336/95168instacron: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:34982025-09-10 13:08:35.27CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface
title Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface
spellingShingle Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface
Antelo, Juan
ARSENATE ADSORPTION
CD-MUSIC MODEL
ELECTROPHORETIC MOBILITIES
OXIDE-WATER INTERFACE
PHOSPHATE ADSORPTION
SURFACE CHARGE
title_short Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface
title_full Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface
title_fullStr Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface
title_full_unstemmed Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface
title_sort Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface
dc.creator.none.fl_str_mv Antelo, Juan
Avena, Marcelo Javier
Fiol, Sarah
López, Rocío
Arce, Florencio
author Antelo, Juan
author_facet Antelo, Juan
Avena, Marcelo Javier
Fiol, Sarah
López, Rocío
Arce, Florencio
author_role author
author2 Avena, Marcelo Javier
Fiol, Sarah
López, Rocío
Arce, Florencio
author2_role author
author
author
author
dc.subject.none.fl_str_mv ARSENATE ADSORPTION
CD-MUSIC MODEL
ELECTROPHORETIC MOBILITIES
OXIDE-WATER INTERFACE
PHOSPHATE ADSORPTION
SURFACE CHARGE
topic ARSENATE ADSORPTION
CD-MUSIC MODEL
ELECTROPHORETIC MOBILITIES
OXIDE-WATER INTERFACE
PHOSPHATE ADSORPTION
SURFACE CHARGE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The surface properties of a well-crystallized synthetic goethite have been studied by acid-base potentiometric titrations, electrophoresis, and phosphate and arsenate adsorption isotherms at different pH and electrolyte concentrations. The PZC and IEP of the studied goethite were 9.3±0.1 and 9.3±0.2, respectively. Phosphate and arsenate adsorption decrease as the pH increases in either 0.1 or 0.01 M KNO3 solutions. Phosphate adsorption is more sensitive to changes in pH and ionic strength than that of arsenate. The combined effects of pH and ionic strength result in higher phosphate adsorption in acidic media at most ionic strengths, but result in lower phosphate adsorption in basic media and low ionic strengths. The CD-MUSIC model yields rather good fit of the experimental data. For phosphate it was necessary to postulate the presence of three inner-sphere surface complexes (monodentate nonprotonated, bidentate nonprotonated, and bidentate protonated). In contrast, arsenate could be well described by postulating only the presence of the two bidenate species. A small improvement of the arsenate adsorption data could be achieved by assuming the presence of a monodentate protonated species. Model predictions are in agreement with spectroscopic evidence, which suggest, especially for the case of arsenate, that mainly bidentate inner-sphere complexes are formed at the goethite-water interface.
Fil: Antelo, Juan. Universidad de Santiago de Compostela; España
Fil: Avena, Marcelo Javier. 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: Fiol, Sarah. Universidad de Santiago de Compostela; España
Fil: López, Rocío. Universidad de Santiago de Compostela; España
Fil: Arce, Florencio. Universidad de Santiago de Compostela; España
description The surface properties of a well-crystallized synthetic goethite have been studied by acid-base potentiometric titrations, electrophoresis, and phosphate and arsenate adsorption isotherms at different pH and electrolyte concentrations. The PZC and IEP of the studied goethite were 9.3±0.1 and 9.3±0.2, respectively. Phosphate and arsenate adsorption decrease as the pH increases in either 0.1 or 0.01 M KNO3 solutions. Phosphate adsorption is more sensitive to changes in pH and ionic strength than that of arsenate. The combined effects of pH and ionic strength result in higher phosphate adsorption in acidic media at most ionic strengths, but result in lower phosphate adsorption in basic media and low ionic strengths. The CD-MUSIC model yields rather good fit of the experimental data. For phosphate it was necessary to postulate the presence of three inner-sphere surface complexes (monodentate nonprotonated, bidentate nonprotonated, and bidentate protonated). In contrast, arsenate could be well described by postulating only the presence of the two bidenate species. A small improvement of the arsenate adsorption data could be achieved by assuming the presence of a monodentate protonated species. Model predictions are in agreement with spectroscopic evidence, which suggest, especially for the case of arsenate, that mainly bidentate inner-sphere complexes are formed at the goethite-water interface.
publishDate 2005
dc.date.none.fl_str_mv 2005-05
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/11336/95168
Antelo, Juan; Avena, Marcelo Javier; Fiol, Sarah; López, Rocío; Arce, Florencio; Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface; Academic Press Inc Elsevier Science; Journal of Colloid and Interface Science; 285; 2; 5-2005; 476-486
0021-9797
CONICET Digital
CONICET
url http://hdl.handle.net/11336/95168
identifier_str_mv Antelo, Juan; Avena, Marcelo Javier; Fiol, Sarah; López, Rocío; Arce, Florencio; Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface; Academic Press Inc Elsevier Science; Journal of Colloid and Interface Science; 285; 2; 5-2005; 476-486
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/pii/S0021979704012354
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jcis.2004.12.032
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
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
_version_ 1842980408912773120
score 12.993085

Publicaciones similares