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Theses

Élaboration et caractérisation d’oxydes de Titane de Morphologie Contrôlée : application à la Photodégradation de Polluants Organiques

Abstract : Two main objectives were achieved in the present work. The first objective concerns the elaboration of nanohybrid materials formed by combining titanium dioxide (in spherical or tubular form) with carbon allotropes (functionalized fullerene or graphene). The second objective consists in evaluating these different nanomaterials in the photodegradation of formic acid (FA) under UV irradiation. A beneficial effect of the different carbon allotropes on the photocatalytic activity of the resulting nanohybrids was observed and ascribed to an increased lifetime of photogenerated electron-hole pairs. In a first step, the elaboration method of functionalized fullerenes and their content were optimized leading to the development of nanomaterials showing improved photocatalytic properties compared to TiO2 nanotube alone. Textural properties, photoelectric properties and the FA degradation rate constant were correlated in order to determine the reasons for the photocatalytic activity improvement. In a second step, a detailed study about the development of a new generation of nanocomposites combining TiO2 nanotubes and graphene oxide (GO) was carried out. The degree of reduction of GO strongly influences the photocatalytic activity. Thus, the addition of reduced GO or GO to TiO2 nanotubes improves the intrinsic photodegradation performance of formic acid by facilitating the transfer of photoelectrons from the conduction band of TiO2 to graphene oxide. Finally, composite materials combining graphene oxide and various anatase/rutile compositions were analyzed showing a synergy between GO and the two TiO2 phases
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https://tel.archives-ouvertes.fr/tel-01769552
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Submitted on : Wednesday, April 18, 2018 - 10:39:06 AM
Last modification on : Wednesday, November 20, 2019 - 2:38:56 AM

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  • HAL Id : tel-01769552, version 1

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Marwa Hamandi. Élaboration et caractérisation d’oxydes de Titane de Morphologie Contrôlée : application à la Photodégradation de Polluants Organiques. Autre. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSE1077⟩. ⟨tel-01769552⟩

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