Purification de l'air ambiant par l'action bactéricide de la photocatalyse

Abstract : This study comes within the scope of improving knowledge concerning the photocatalytic degradation of bacterial bioaerosol. Photocatalysis is a purification technology generally based on the excitation of a semiconductor by an ultraviolet radiation. This technology can, in theoretical ways, mineralize pollutants step by step. However, if optimal conditions are not gathered, this mineralization is incomplete and can lead to the formation of potentially toxic by-products. The aim of this work was therefore a better understanding of the mechanisms of photocatalytic degradation of a bacterial bioaerosol of E.coli, where numerous phenomenon are linked. Thus, to distinguish the different processes, two experimental approaches were used. The first one, called batch approach, allowed to consider the photocatalytic reaction itself, by studying the steps of inactivation, by-products formation and progressive mineralization. The second one, named dynamic approach, consisted to design an experimental setup suited to the photocatalytic degradation of a bioaerosol of E.coli. The abilities of photocatalysis to inactivate and mineralize bacteria could be demonstrated. The key parameters of an efficient degradation were highlighted and allowed to underline the problems to solve before having a safe industrialization of the photocatalysis
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Marie Faure. Purification de l'air ambiant par l'action bactéricide de la photocatalyse. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL076N⟩. ⟨tel-01748807⟩

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