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dc.contributor.author
Romanello, Marina Belén
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dc.contributor.author
Fidalgo, María Marta
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dc.date.available
2017-09-21T21:16:11Z
dc.date.issued
2013-03
dc.identifier.citation
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
dc.identifier.issn
0043-1354
dc.identifier.uri
http://hdl.handle.net/11336/24877
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Nanoparticles
dc.subject
Dlvo Theory
dc.subject
Aggregation
dc.subject
Stability
dc.subject
Divalent Cations
dc.subject
Natural Organic Matter
dc.subject.classification
Ingeniería Oceanográfica
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dc.subject.classification
Ingeniería del Medio Ambiente
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dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
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dc.title
An experimental study on the aggregation of TiO2 nanoparticles under environmentally relevant conditions
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-09-21T18:54:19Z
dc.journal.volume
47
dc.journal.number
12
dc.journal.pagination
3887-3898
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Romanello, Marina Belén. Instituto Tecnológico de Buenos Aires. Departamento de Ingeniería Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Fidalgo, María Marta. Instituto Tecnológico de Buenos Aires. Departamento de Ingeniería Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Water Research
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S004313541300184X
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.watres.2012.11.061
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