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Synthèse, caractérisation et réactivité de matériaux nanostructurés en TiO2 pour la dégradation photo(électro)catalytique du Paraquat

Abstract : The development of photo(electro)catalytic methods for the removal of organic pollutants requires the elaboration of supported TiO2 nanomaterials in order to simplify the recovery of the photocatalyst from treated effluents. Two different approaches were developed during this PhD thesis. The first approach consists in producing a thin film of TiO2 onto alveolar SiC foams. The TiO2/SiC assembly was then integrated into a tubular reactor surrounded by UV-C lamps. Many parameters were studied: number of lamps, the temperature, pollutant’s concentration (paraquat, weed killer) and the mechanical stability of TiO2/SiC foams. Then, paraquat’s by-products of degradation were identified. Another approach was then developed in order to improve the electron-hole pair of the photocatalytic process by applying a small electrical bias. For this purpose, the photocatalyst must be coated on a conductive surface. In this field, TiO2 nanotubes grown on titanium substrate by electrochemical synthesis in a fluoride media are very promising. Many parameters were studied in order to produce large electrodes and favor the upscaling. Photoelectrochemical properties of TiO2 nanotubes were studied and optimized especially concerning nanotube’s length. Besides, photoelectrocatalytic degradation of paraquat evidences that a small applied bias (0,5 to 1 volt) is enough to ensure optimal electron-hole separation. It was also demonstrated that the effluent conductivity also has a large influence on the photoelectrochemical performances.
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Submitted on : Thursday, February 8, 2018 - 10:20:10 AM
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Cédric Marien. Synthèse, caractérisation et réactivité de matériaux nanostructurés en TiO2 pour la dégradation photo(électro)catalytique du Paraquat. Matériaux. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAF045⟩. ⟨tel-01703931⟩

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