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Synthèse et caractérisation d'oxydes mixtes de bismuth pour la photocatalyse dans le visible

Abstract : The aim of this work is to improve photocatalytic performance of two mixed bismuth oxides, Bi2WO6 and BiOBr, which have an activity within visible range of the electromagnetic spectrum. Two different strategies have been developed for each material. First one consists in designing a heterostructure between Bi2WO6 and a noble metal, platinum, which ensures an efficient charge separation at the interface. Second one aims at lowering BiOBr particle’s size in order to boost specific surface and shrink mean free path of charges to the surface of the photocatalyst. Syntheses of the materials were carried out using soft chemistry method. Platinum particle distribution and quantity on Bi2WO6 were thus successfully tuned and BiOBr microspheres or plates with different size were obtained. Photocatalytic properties of our materials were characterized by rhodamine B degradation in solution under blue light (λ = 445 nm). Degradation test of non-photosensitive compounds were also performed to show their photocatalytic activity. In order to evaluate Bi2WO6 and BiOBr potential in purifying indoor air photocatalytic degradation tests of model gaseous pollutant were performed. All these photocatalytic tests highlight the relationship between physicochemical and photocatalytic properties of the materials. They also enable us to determine the potentials and limitations of Bi2WO6 and BiOBr as photocatalysts for water and air depollution.
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https://tel.archives-ouvertes.fr/tel-01085903
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Submitted on : Friday, November 21, 2014 - 2:25:43 PM
Last modification on : Wednesday, September 23, 2020 - 4:33:42 AM
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  • HAL Id : tel-01085903, version 1

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Marie-Anne Lavergne. Synthèse et caractérisation d'oxydes mixtes de bismuth pour la photocatalyse dans le visible. Matériaux. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066236⟩. ⟨tel-01085903⟩

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