Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye

Autores
Zanini, Graciela Pilar; Avena, Marcelo Javier; Fiol, Sarah; Arce, Florencio
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The binding between an oxazine dye and a humic acid was studied in aqueous solutions in the pH range 4-10 and in the supporting electrolyte (KCl) range 0.001-0.1 M. A rather simple spectrophotometric method was developed to construct binding isotherms under conditions were traditional centrifugation or filtration methods fail. The use of this method is possible because humic acid molecules have the ability of changing the spectrum of dye molecules, and this ability is used to quantify the isotherms. All binding isotherms have a Langmuirian shape. The amount of bound dye is strongly dependent on the ionic strength and less dependent on the pH of the solution. The binding is rather strong and mainly driven by non-electrostatic forces. Whereas the Langmuir binding constant is independent of the pH and electrolyte concentration, the number of assessable sites in humic acid for binding oxazine increases by increasing pH and decreasing electrolyte concentration. These results can be directly related to the flexibility of humic acid molecules, which can swell at high pH and low ionic strength, increasing consequently the availability of binding sites. The results also indicate that humic substances may strongly affect the mobility and fate of dyes and related pollutants in the environment.
Fil: Zanini, Graciela Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina
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: Arce, Florencio. Universidad de Santiago de Compostela; España
Materia
BINDING ISOTHERMS
DYES
HUMIC SUBSTANCES
ORGANIC POLLUTANTS
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:11336/95348
Acceder
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dyeZanini, Graciela PilarAvena, Marcelo JavierFiol, SarahArce, FlorencioBINDING ISOTHERMSDYESHUMIC SUBSTANCESORGANIC POLLUTANTShttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The binding between an oxazine dye and a humic acid was studied in aqueous solutions in the pH range 4-10 and in the supporting electrolyte (KCl) range 0.001-0.1 M. A rather simple spectrophotometric method was developed to construct binding isotherms under conditions were traditional centrifugation or filtration methods fail. The use of this method is possible because humic acid molecules have the ability of changing the spectrum of dye molecules, and this ability is used to quantify the isotherms. All binding isotherms have a Langmuirian shape. The amount of bound dye is strongly dependent on the ionic strength and less dependent on the pH of the solution. The binding is rather strong and mainly driven by non-electrostatic forces. Whereas the Langmuir binding constant is independent of the pH and electrolyte concentration, the number of assessable sites in humic acid for binding oxazine increases by increasing pH and decreasing electrolyte concentration. These results can be directly related to the flexibility of humic acid molecules, which can swell at high pH and low ionic strength, increasing consequently the availability of binding sites. The results also indicate that humic substances may strongly affect the mobility and fate of dyes and related pollutants in the environment.Fil: Zanini, Graciela Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; ArgentinaFil: 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: Arce, Florencio. Universidad de Santiago de Compostela; EspañaPergamon-Elsevier Science Ltd2006-04info: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/11336/95348Zanini, Graciela Pilar; Avena, Marcelo Javier; Fiol, Sarah; Arce, Florencio; Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye; Pergamon-Elsevier Science Ltd; Chemosphere; 63; 3; 4-2006; 430-4390045-6535CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemosphere.2005.08.053info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0045653505011288info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:50:04Zoai:ri.conicet.gov.ar:11336/95348instacron: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 09:50:04.858CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye
title Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye
spellingShingle Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye
Zanini, Graciela Pilar
BINDING ISOTHERMS
DYES
HUMIC SUBSTANCES
ORGANIC POLLUTANTS
title_short Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye
title_full Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye
title_fullStr Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye
title_full_unstemmed Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye
title_sort Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye
dc.creator.none.fl_str_mv Zanini, Graciela Pilar
Avena, Marcelo Javier
Fiol, Sarah
Arce, Florencio
author Zanini, Graciela Pilar
author_facet Zanini, Graciela Pilar
Avena, Marcelo Javier
Fiol, Sarah
Arce, Florencio
author_role author
author2 Avena, Marcelo Javier
Fiol, Sarah
Arce, Florencio
author2_role author
author
author
dc.subject.none.fl_str_mv BINDING ISOTHERMS
DYES
HUMIC SUBSTANCES
ORGANIC POLLUTANTS
topic BINDING ISOTHERMS
DYES
HUMIC SUBSTANCES
ORGANIC POLLUTANTS
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 binding between an oxazine dye and a humic acid was studied in aqueous solutions in the pH range 4-10 and in the supporting electrolyte (KCl) range 0.001-0.1 M. A rather simple spectrophotometric method was developed to construct binding isotherms under conditions were traditional centrifugation or filtration methods fail. The use of this method is possible because humic acid molecules have the ability of changing the spectrum of dye molecules, and this ability is used to quantify the isotherms. All binding isotherms have a Langmuirian shape. The amount of bound dye is strongly dependent on the ionic strength and less dependent on the pH of the solution. The binding is rather strong and mainly driven by non-electrostatic forces. Whereas the Langmuir binding constant is independent of the pH and electrolyte concentration, the number of assessable sites in humic acid for binding oxazine increases by increasing pH and decreasing electrolyte concentration. These results can be directly related to the flexibility of humic acid molecules, which can swell at high pH and low ionic strength, increasing consequently the availability of binding sites. The results also indicate that humic substances may strongly affect the mobility and fate of dyes and related pollutants in the environment.
Fil: Zanini, Graciela Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina
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: Arce, Florencio. Universidad de Santiago de Compostela; España
description The binding between an oxazine dye and a humic acid was studied in aqueous solutions in the pH range 4-10 and in the supporting electrolyte (KCl) range 0.001-0.1 M. A rather simple spectrophotometric method was developed to construct binding isotherms under conditions were traditional centrifugation or filtration methods fail. The use of this method is possible because humic acid molecules have the ability of changing the spectrum of dye molecules, and this ability is used to quantify the isotherms. All binding isotherms have a Langmuirian shape. The amount of bound dye is strongly dependent on the ionic strength and less dependent on the pH of the solution. The binding is rather strong and mainly driven by non-electrostatic forces. Whereas the Langmuir binding constant is independent of the pH and electrolyte concentration, the number of assessable sites in humic acid for binding oxazine increases by increasing pH and decreasing electrolyte concentration. These results can be directly related to the flexibility of humic acid molecules, which can swell at high pH and low ionic strength, increasing consequently the availability of binding sites. The results also indicate that humic substances may strongly affect the mobility and fate of dyes and related pollutants in the environment.
publishDate 2006
dc.date.none.fl_str_mv 2006-04
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/11336/95348
Zanini, Graciela Pilar; Avena, Marcelo Javier; Fiol, Sarah; Arce, Florencio; Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye; Pergamon-Elsevier Science Ltd; Chemosphere; 63; 3; 4-2006; 430-439
0045-6535
CONICET Digital
CONICET
url http://hdl.handle.net/11336/95348
identifier_str_mv Zanini, Graciela Pilar; Avena, Marcelo Javier; Fiol, Sarah; Arce, Florencio; Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye; Pergamon-Elsevier Science Ltd; Chemosphere; 63; 3; 4-2006; 430-439
0045-6535
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.chemosphere.2005.08.053
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0045653505011288
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 Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
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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