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Article Dans Une Revue Microporous and Mesoporous Materials Année : 2024

Soft-templated mesostructured TiO2 - SiO2 composites with high thermal stability

Résumé

To overcome the drawbacks of pure mesostructured titania and in particular the low thermal stability, in this study we have investigated in detail the effect of Si4+ addition on the properties of mesostructured TiO2 prepared by combining the sol-gel process and the surfactant templating mechanism. Obtained materials have also been tested for the photodegradation of methyl orange, used as a model dye. From the SAXS and the manometry nitrogen adsorption-desorption analyses, it can be concluded that the presence of Si4+ delays the collapse of the mesopores network. Compared to the bare mesostructured TiO2, the XRD and Raman results show that the anatase and the rutile phases appear at higher temperature. The higher the Si4+ content, the higher the amorphous-anatase and rutile anatase-phase transition temperatures. The delay in the crystallization also allows the detection of the TiO2-β phase, which is an anatase phase with oxygen vacancies. These phenomena have been attributed to the « glass effect ». In that case, amorphous SiO2, which is formed during the synthesis, surrounds the titania particles and inhibits their growth, when the heating temperature is increased. By this way, the thermal stability of the mesostructured titania containing Si4+ is enhanced. Photocatalytic experiments highlight the importance of the presence of the anatase phase for the discoloration efficiency of the dye solution. Indeed, the increase of Si4+ leads to a clear decrease of the photodegradation efficiency.
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hal-04511114 , version 1 (19-03-2024)

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Bénédicte Lebeau, Florian Jonas, Laure Michelin, Jean-Luc Blin. Soft-templated mesostructured TiO2 - SiO2 composites with high thermal stability. Microporous and Mesoporous Materials, 2024, 364, pp.112851. ⟨10.1016/j.micromeso.2023.112851⟩. ⟨hal-04511114⟩
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