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Nanocomposites interactifs supportes en tant que photocatalyseurs contemporains et materiaux germicides : concepts et applications

Abstract : The current research is undertaken in the context of the complete reconsideration of the supported composite photocatalysts (SCPC) chemical design and elaboration principles in order to improve their reaction capacities, to assure the sustainability of their action in time and to resolve the secondary pollution problem for the media to treat. This work enabled the implementation of a new model of interactive SCPC in which the photosensitive components occur in a strong chemical interaction with their supports belonging to the Lewis acid group. This feature provides the developed products with high selectivity, allows them to function in the stationary conditions, avoids the secondary pollution effect and guarantees the photocatalytic performance comparable with the one of the reference industrial photocatalyst Degussa P25. An important scientific knowledge on the role of the surface acidity in the photocatalytic action and on the dissociation state of the water adsorbed over the active product was acquired. Apart from this, a set of eight main parameters ensuring the best SCPC operation properties was established. The developed SCPC are forecasted to be firstly applied in the photocatalytic VOC oxidation processes. A prototype of such filter capable to treat 50 m3/h of air, having modest energy consumption, was designed. A new composite material with germicidal properties elaborated using synthetic polymer supports, also constitutes a subject of the applications part of this thesis.
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Razvan Vasile Gärban. Nanocomposites interactifs supportes en tant que photocatalyseurs contemporains et materiaux germicides : concepts et applications. Autre. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. Français. ⟨NNT : 2011EMSE0614⟩. ⟨tel-00820632⟩

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