An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions

Autores
Romanello, Marina Belén; Fidalgo, María Marta
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The eventual future scenario of a release of nanomaterials into the environment makes it necessary to assess the risk involved in their use by studying their behavior in natural waters. NanoTiO2 is one of the most commonly employed nanomaterials. In the present work we studied the aggregation rates, aggregate size and aggregate morphology of NanoTiO2 under the presence of inert electrolytes, divalent cations, and these two combined with natural organic matter, in an effort to provide a comprehensive investigation of the phenomena of interaction of nanomaterials and natural waters and elucidate some of the conflicting information reported in the literature. The stability of nanoparticles could be explained in all cases, at least qualitatively, in terms of classical DLVO interactions (Electrical Double Layer, Van der Waals). Divalent cations were adsorbed to the surface of the nanoparticles, neutralizing the negative charge at pH values greater than the point of zero charge and inducing aggregation. Natural organic matter (NOM) adsorbed to the particles and made their zeta potential more negative, hence stabilizing them by lowering the pH of maximum aggregation. Divalent cations partially neutralized the adsorbed NOM, and at high concentrations aggregation was observed with Ca2+ but not Mg2+, suggesting the presence of specific Ca2+–NOM bridges. SEM images visually revealed a fractal-like morphology of the aggregates formed under unfavorable conditions.
Fil: Romanello, Marina Belén. Instituto Tecnológico de Buenos Aires. Departamento de Ingeniería Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Fidalgo, María Marta. Instituto Tecnológico de Buenos Aires. Departamento de Ingeniería Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
Nanoparticles
Dlvo Theory
Aggregation
Stability
Divalent Cations
Natural Organic Matter
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:11336/24877

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network_name_str CONICET Digital (CONICET)
spelling An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditionsRomanello, Marina BelénFidalgo, María MartaNanoparticlesDlvo TheoryAggregationStabilityDivalent CationsNatural Organic Matterhttps://purl.org/becyt/ford/2.7https://purl.org/becyt/ford/2The eventual future scenario of a release of nanomaterials into the environment makes it necessary to assess the risk involved in their use by studying their behavior in natural waters. NanoTiO2 is one of the most commonly employed nanomaterials. In the present work we studied the aggregation rates, aggregate size and aggregate morphology of NanoTiO2 under the presence of inert electrolytes, divalent cations, and these two combined with natural organic matter, in an effort to provide a comprehensive investigation of the phenomena of interaction of nanomaterials and natural waters and elucidate some of the conflicting information reported in the literature. The stability of nanoparticles could be explained in all cases, at least qualitatively, in terms of classical DLVO interactions (Electrical Double Layer, Van der Waals). Divalent cations were adsorbed to the surface of the nanoparticles, neutralizing the negative charge at pH values greater than the point of zero charge and inducing aggregation. Natural organic matter (NOM) adsorbed to the particles and made their zeta potential more negative, hence stabilizing them by lowering the pH of maximum aggregation. Divalent cations partially neutralized the adsorbed NOM, and at high concentrations aggregation was observed with Ca2+ but not Mg2+, suggesting the presence of specific Ca2+–NOM bridges. SEM images visually revealed a fractal-like morphology of the aggregates formed under unfavorable conditions.Fil: Romanello, Marina Belén. Instituto Tecnológico de Buenos Aires. Departamento de Ingeniería Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fidalgo, María Marta. Instituto Tecnológico de Buenos Aires. Departamento de Ingeniería Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaElsevier2013-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/24877Romanello, Marina Belén; Fidalgo, María Marta; An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions; Elsevier; Water Research; 47; 12; 3-2013; 3887-38980043-1354CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S004313541300184Xinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.watres.2012.11.061info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:46:40Zoai:ri.conicet.gov.ar:11336/24877instacron: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:34982025-10-15 15:46:41.256CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions
title An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions
spellingShingle An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions
Romanello, Marina Belén
Nanoparticles
Dlvo Theory
Aggregation
Stability
Divalent Cations
Natural Organic Matter
title_short An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions
title_full An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions
title_fullStr An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions
title_full_unstemmed An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions
title_sort An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions
dc.creator.none.fl_str_mv Romanello, Marina Belén
Fidalgo, María Marta
author Romanello, Marina Belén
author_facet Romanello, Marina Belén
Fidalgo, María Marta
author_role author
author2 Fidalgo, María Marta
author2_role author
dc.subject.none.fl_str_mv Nanoparticles
Dlvo Theory
Aggregation
Stability
Divalent Cations
Natural Organic Matter
topic Nanoparticles
Dlvo Theory
Aggregation
Stability
Divalent Cations
Natural Organic Matter
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.7
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The eventual future scenario of a release of nanomaterials into the environment makes it necessary to assess the risk involved in their use by studying their behavior in natural waters. NanoTiO2 is one of the most commonly employed nanomaterials. In the present work we studied the aggregation rates, aggregate size and aggregate morphology of NanoTiO2 under the presence of inert electrolytes, divalent cations, and these two combined with natural organic matter, in an effort to provide a comprehensive investigation of the phenomena of interaction of nanomaterials and natural waters and elucidate some of the conflicting information reported in the literature. The stability of nanoparticles could be explained in all cases, at least qualitatively, in terms of classical DLVO interactions (Electrical Double Layer, Van der Waals). Divalent cations were adsorbed to the surface of the nanoparticles, neutralizing the negative charge at pH values greater than the point of zero charge and inducing aggregation. Natural organic matter (NOM) adsorbed to the particles and made their zeta potential more negative, hence stabilizing them by lowering the pH of maximum aggregation. Divalent cations partially neutralized the adsorbed NOM, and at high concentrations aggregation was observed with Ca2+ but not Mg2+, suggesting the presence of specific Ca2+–NOM bridges. SEM images visually revealed a fractal-like morphology of the aggregates formed under unfavorable conditions.
Fil: Romanello, Marina Belén. Instituto Tecnológico de Buenos Aires. Departamento de Ingeniería Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Fidalgo, María Marta. Instituto Tecnológico de Buenos Aires. Departamento de Ingeniería Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description The eventual future scenario of a release of nanomaterials into the environment makes it necessary to assess the risk involved in their use by studying their behavior in natural waters. NanoTiO2 is one of the most commonly employed nanomaterials. In the present work we studied the aggregation rates, aggregate size and aggregate morphology of NanoTiO2 under the presence of inert electrolytes, divalent cations, and these two combined with natural organic matter, in an effort to provide a comprehensive investigation of the phenomena of interaction of nanomaterials and natural waters and elucidate some of the conflicting information reported in the literature. The stability of nanoparticles could be explained in all cases, at least qualitatively, in terms of classical DLVO interactions (Electrical Double Layer, Van der Waals). Divalent cations were adsorbed to the surface of the nanoparticles, neutralizing the negative charge at pH values greater than the point of zero charge and inducing aggregation. Natural organic matter (NOM) adsorbed to the particles and made their zeta potential more negative, hence stabilizing them by lowering the pH of maximum aggregation. Divalent cations partially neutralized the adsorbed NOM, and at high concentrations aggregation was observed with Ca2+ but not Mg2+, suggesting the presence of specific Ca2+–NOM bridges. SEM images visually revealed a fractal-like morphology of the aggregates formed under unfavorable conditions.
publishDate 2013
dc.date.none.fl_str_mv 2013-03
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/11336/24877
Romanello, Marina Belén; Fidalgo, María Marta; An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions; Elsevier; Water Research; 47; 12; 3-2013; 3887-3898
0043-1354
CONICET Digital
CONICET
url http://hdl.handle.net/11336/24877
identifier_str_mv Romanello, Marina Belén; Fidalgo, María Marta; An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions; Elsevier; Water Research; 47; 12; 3-2013; 3887-3898
0043-1354
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S004313541300184X
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.watres.2012.11.061
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
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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