Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature

Autores
Brigante, Maximiliano Eduardo; Schulz, Pablo Carlos
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The adsorption of the herbicide paraquat (PQ 2+) on the binary system titania-silica has been studied in batch experiments by performing adsorption isotherms under different conditions of pH, supporting electrolyte concentration, and temperature. Adsorption kinetic on the studied material has also been carried out and discussed. PQ 2+ adsorption is very low on the bare silica surface but important on the composed TiO 2-SiO 2 adsorbent. In this last case, the adsorption increases by increasing pH and decreasing electrolyte concentration. There are no significant effects of temperature on the adsorption. The increase of the adsorption in TiO 2-SiO 2 seems to be related to an increase in acid sites of the supported titania and to the homogenously dispersion of the TiO 2 nanoparticles over the silica support. The adsorption takes place by direct binding of PQ 2+ to TiO 2 leading to the formation of surface species of the type SiO 2-TiO 2-PQ 2+. Electrostatic interactions and charge-transfer and outer-sphere complexes formations seem to play a key role in the adsorption mechanism. The analysis of thermodynamic parameters suggests that the adsorption on TiO 2-SiO 2 is endothermic and spontaneous in nature. © 2011 Elsevier Inc.
Fil: Brigante, Maximiliano Eduardo. 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: Schulz, Pablo Carlos. 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
Materia
Adsorption
Paraquat
Silica
Solid-Water Interface
Surface Complexes
Titania
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:11336/64005
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperatureBrigante, Maximiliano EduardoSchulz, Pablo CarlosAdsorptionParaquatSilicaSolid-Water InterfaceSurface ComplexesTitaniahttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The adsorption of the herbicide paraquat (PQ 2+) on the binary system titania-silica has been studied in batch experiments by performing adsorption isotherms under different conditions of pH, supporting electrolyte concentration, and temperature. Adsorption kinetic on the studied material has also been carried out and discussed. PQ 2+ adsorption is very low on the bare silica surface but important on the composed TiO 2-SiO 2 adsorbent. In this last case, the adsorption increases by increasing pH and decreasing electrolyte concentration. There are no significant effects of temperature on the adsorption. The increase of the adsorption in TiO 2-SiO 2 seems to be related to an increase in acid sites of the supported titania and to the homogenously dispersion of the TiO 2 nanoparticles over the silica support. The adsorption takes place by direct binding of PQ 2+ to TiO 2 leading to the formation of surface species of the type SiO 2-TiO 2-PQ 2+. Electrostatic interactions and charge-transfer and outer-sphere complexes formations seem to play a key role in the adsorption mechanism. The analysis of thermodynamic parameters suggests that the adsorption on TiO 2-SiO 2 is endothermic and spontaneous in nature. © 2011 Elsevier Inc.Fil: Brigante, Maximiliano Eduardo. 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: Schulz, Pablo Carlos. 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; ArgentinaAcademic Press Inc Elsevier Science2011-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/64005Brigante, Maximiliano Eduardo; Schulz, Pablo Carlos; Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature; Academic Press Inc Elsevier Science; Journal of Colloid and Interface Science; 363; 1; 11-2011; 355-3610021-9797CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S002197971100926Xinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.jcis.2011.07.061info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:43:22Zoai:ri.conicet.gov.ar:11336/64005instacron: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 09:43:22.853CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature
title Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature
spellingShingle Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature
Brigante, Maximiliano Eduardo
Adsorption
Paraquat
Silica
Solid-Water Interface
Surface Complexes
Titania
title_short Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature
title_full Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature
title_fullStr Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature
title_full_unstemmed Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature
title_sort Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature
dc.creator.none.fl_str_mv Brigante, Maximiliano Eduardo
Schulz, Pablo Carlos
author Brigante, Maximiliano Eduardo
author_facet Brigante, Maximiliano Eduardo
Schulz, Pablo Carlos
author_role author
author2 Schulz, Pablo Carlos
author2_role author
dc.subject.none.fl_str_mv Adsorption
Paraquat
Silica
Solid-Water Interface
Surface Complexes
Titania
topic Adsorption
Paraquat
Silica
Solid-Water Interface
Surface Complexes
Titania
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 adsorption of the herbicide paraquat (PQ 2+) on the binary system titania-silica has been studied in batch experiments by performing adsorption isotherms under different conditions of pH, supporting electrolyte concentration, and temperature. Adsorption kinetic on the studied material has also been carried out and discussed. PQ 2+ adsorption is very low on the bare silica surface but important on the composed TiO 2-SiO 2 adsorbent. In this last case, the adsorption increases by increasing pH and decreasing electrolyte concentration. There are no significant effects of temperature on the adsorption. The increase of the adsorption in TiO 2-SiO 2 seems to be related to an increase in acid sites of the supported titania and to the homogenously dispersion of the TiO 2 nanoparticles over the silica support. The adsorption takes place by direct binding of PQ 2+ to TiO 2 leading to the formation of surface species of the type SiO 2-TiO 2-PQ 2+. Electrostatic interactions and charge-transfer and outer-sphere complexes formations seem to play a key role in the adsorption mechanism. The analysis of thermodynamic parameters suggests that the adsorption on TiO 2-SiO 2 is endothermic and spontaneous in nature. © 2011 Elsevier Inc.
Fil: Brigante, Maximiliano Eduardo. 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: Schulz, Pablo Carlos. 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
description The adsorption of the herbicide paraquat (PQ 2+) on the binary system titania-silica has been studied in batch experiments by performing adsorption isotherms under different conditions of pH, supporting electrolyte concentration, and temperature. Adsorption kinetic on the studied material has also been carried out and discussed. PQ 2+ adsorption is very low on the bare silica surface but important on the composed TiO 2-SiO 2 adsorbent. In this last case, the adsorption increases by increasing pH and decreasing electrolyte concentration. There are no significant effects of temperature on the adsorption. The increase of the adsorption in TiO 2-SiO 2 seems to be related to an increase in acid sites of the supported titania and to the homogenously dispersion of the TiO 2 nanoparticles over the silica support. The adsorption takes place by direct binding of PQ 2+ to TiO 2 leading to the formation of surface species of the type SiO 2-TiO 2-PQ 2+. Electrostatic interactions and charge-transfer and outer-sphere complexes formations seem to play a key role in the adsorption mechanism. The analysis of thermodynamic parameters suggests that the adsorption on TiO 2-SiO 2 is endothermic and spontaneous in nature. © 2011 Elsevier Inc.
publishDate 2011
dc.date.none.fl_str_mv 2011-11
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/11336/64005
Brigante, Maximiliano Eduardo; Schulz, Pablo Carlos; Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature; Academic Press Inc Elsevier Science; Journal of Colloid and Interface Science; 363; 1; 11-2011; 355-361
0021-9797
CONICET Digital
CONICET
url http://hdl.handle.net/11336/64005
identifier_str_mv Brigante, Maximiliano Eduardo; Schulz, Pablo Carlos; Adsorption of paraquat on mesoporous silica modified with titania: Effects of pH, ionic strength and temperature; Academic Press Inc Elsevier Science; Journal of Colloid and Interface Science; 363; 1; 11-2011; 355-361
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/S002197971100926X
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jcis.2011.07.061
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
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 13.070432

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