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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/24877
Ver los metadatos del registro completo
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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) |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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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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13.22299 |