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Impact of alginate concentration on the stability of agglomerates made of TiO2 engineered nanoparticles: Water hardness and pH effects

Loosli, Frédéric ; Le Coustumer, Philippe ; Stoll, Serge

In: Journal of Nanoparticle Research, 2015, vol. 17, no. 1, p. 1-9

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    Titre
    • Impact of alginate concentration on the stability of agglomerates made of TiO2 engineered nanoparticles: Water hardness and pH effects
    Auteur
    • Loosli, Frédéric. Section des Sciences de la Terre et de l'Environnement, Group of Environmental Physical Chemistry, F.-A. Forel Institute, University of Geneva, 10 route de Suisse, 1290, Versoix, Switzerland
    • Le Coustumer, Philippe. Université Bordeaux 3, EA 4592 Géoressources & Environnement, ENSEGID, 1 allée F. Daguin, 33607, Pessac, France
    • Stoll, Serge. Section des Sciences de la Terre et de l'Environnement, Group of Environmental Physical Chemistry, F.-A. Forel Institute, University of Geneva, 10 route de Suisse, 1290, Versoix, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Nanoparticle Research, 2015, vol. 17, no. 1, p. 1-9. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:332472
    Summary
    The stability of engineered nanoparticles in natural aquatic systems is of high interest for environmental risk assessment since an already important quantity of these reactive species is entering aquatic systems. In the present study, an important issue is addressed by investigating (i) the influence of divalent cations and water hardness (Mg2+ and Ca2+) in agglomerate formation and (ii) alginate concentration effect on the stability TiO2 agglomerates formed in environmental freshwater conditions (pH and total hardness) representative of Lake Geneva, France/Switzerland. Our results indicate that the presence of alginate at typical natural organic matter concentration strongly modifies the stability of TiO2 nanoparticle agglomerates by inducing their partial disagglomeration. Significant TiO2 nanoparticles redispersion and formation of small fragments are expected to be induced by alginate adsorbed layer formed at the nanoparticle surfaces within the agglomerates. Graphical Abstract: