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Elaboration of mixed metal oxide ZrᵪTi₁-ᵪO₂ nano-photocatalysts

Abstract : The PhD study is focused on synthesis of nanoparticulate ZrᵪTi₁-ᵪO₂ composites : from nucleation stage of nanoparticles to bulk crystalline solid and their application in photocatalysis. The synthesis was achieved in a sol-gel micromixing reactor using titanium (IV) isopropoxide and zirconium(IV) propoxide precursors in different molar and hydrolysis ratios, resulting in monodispersed zirconium-titanium oxo-alkoxy (ZTOA) nanoparticles : R=1.6 nm for 0≤x≤0.2, R=2.1 nm for 0.3≤x≤0.6 with orthorambic and ZOA of R=1.8 nm for 0.7≤x≤1. They convert after heat treatment to nanoporous crystallite in respectively anatase, orthorambic and monoclinic/tetragonal crystalline phases, which onset temperature depend on x. The anatase compositions (0≤x≤0.2) were selected for photocatalytic applications in gas phase (ethylene) and liquid phase (MB and phenol) degradation. The optimum composition x=0.0425 heat treated at 500 °C revealed the strongest activity, two times higher than pure TiO₂. We found that the photocatalytic activity directly correlates with the specific surface area.
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Khley Cheng. Elaboration of mixed metal oxide ZrᵪTi₁-ᵪO₂ nano-photocatalysts. Chemical and Process Engineering. Université Sorbonne Paris Cité, 2018. English. ⟨NNT : 2018USPCD039⟩. ⟨tel-02491167⟩

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