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<dc:title xml:lang="fr">Transport de nanoparticules de TiO2 en milieux poreux saturés et non saturés : expériences et modélisation</dc:title>
<dcterms:alternative xml:lang="en">Transport of TiO2 nanoparticles in saturated and unsaturated porous media : experiments and modeling</dcterms:alternative>
<dc:subject xml:lang="fr">Nanoparticules</dc:subject>
<dc:subject xml:lang="fr">Dioxyde de titane</dc:subject>
<dc:subject xml:lang="fr">Milieu poreux</dc:subject>
<dc:subject xml:lang="fr">Rétention</dc:subject>
<dc:subject xml:lang="fr">Transport</dc:subject>
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<dc:subject xml:lang="fr">Modélisation</dc:subject>
<dc:subject xml:lang="en">Nanoparticles</dc:subject>
<dc:subject xml:lang="en">Titanium dioxide</dc:subject>
<dc:subject xml:lang="en">Porous medium</dc:subject>
<dc:subject xml:lang="en">Retention</dc:subject>
<dc:subject xml:lang="en">Transport</dc:subject>
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<tef:elementdEntree autoriteExterne="027229890" autoriteSource="Sudoc">Chimie des surfaces</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027789748" autoriteSource="Sudoc">Absorption</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le transport de nanoparticules (NP) de dioxyde de titane (TiO2) manufacturées a été étudié dans un milieu poreux sous différentes conditions de saturation, vitesse d’écoulement et force ionique (IS). Les courbes de percée montrent que la quantité de NP retenue diminue quand la vitesse d’écoulement augmente, et qu’elle est influencée par la teneur en eau en présence d’une IS plus grande que 3 mM KCl. On peut supposer que l’interface entre eau et air (AWI) ne retient pas de NP en présence d’IS supérieurs ou égaux à 3 mM KCl. Les courbes de percées des expériences conduites en présence d’une IS de 5 mM, influencées par les profils de teneur en eau et de vitesse, ont été modélisées. Le modèle de transport 3P, qui tient en compte l’AWI et les effets de la vitesse, a été développé pour décrire la rétention des NP. Ce modèle dépend de trois paramètres et du profil de teneur en eau, modélisé à travers les paramètres hydrodynamiques identifiés auparavant. Le modèle 3P donne lieu à une meilleure description des données par rapport à celle du modèle classique, souvent utilisé en littérature. Il peut d’ailleurs être utilisé en milieu saturé comme insaturé.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The transport of manufactured titanium dioxide (TiO2, rutile) nanoparticles (NP) in porous media was investigated under different saturation, water velocity and ionic strength (IS) conditions. The breakthrough curves show that the amount of retained NPs decreases when the water velocity increased and that TiO2 NP retention is influenced by the water content for values of IS larger than 3mM KCl. It can be assumed that the interface between air and water (AWI) does not retain TiO2 NPfor IS equal to, or smaller than, 3 mM KCl.The breakthrough curves with an IS of 5mM KCl, influenced by water content profile and watervelocity profile, were modeled. The 3P transport model was developed to describe the retention ofTiO2 NP, taking into account the AWI and the effects of the water velocity. This model depends on three parameters and takes into account the water content profile of the porous medium, modeled through the previously identified hydrodynamic parameters. The 3P model provides a better data description than the classic Langmuirian retention model, often used in the literature. Moreover, it can be applied under both saturated and unsaturated conditions.</dcterms:abstract>
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