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Article Dans Une Revue Ceramics International Année : 2016

Novel Lu-doped Bi2WO6 nanosheets: Synthesis, growth mechanisms and enhanced photocatalytic activity under UV-light irradiation

Résumé

Polycrystalline systems of lutetium doped bismuth tungstates Bi2WO6: Lu (Lu at% 0, 2, 5 and 8) were synthesized using the coprecipitation method, followed by thermal treatment at 500 degrees C. The Bi2WO6:Lu samples were characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-Ray analysis (EDS) and UV-vis diffuse reflectance spectra (DRS). The XRD and SEM analyses showed that the as-prepared samples crystallized in the same orthorhombic structure and consist of agglomerated nanosheets. To characterize the photocatalytic activities, UV-visible spectrometry was used to analyze the evolution of Rhodamine B photodegradation in presence of the Bi2WO6: Lu photo catalysts. The characteristic absorption band of Rhodamine B at 554 nm shifted to lower wavelengths under UV irradiation. The pure Bi2WO6 and the 5% Lu doped Bi2WO6 photocatalysts presented the lowest and highest efficiencies, respectively. An interpretation of improved photocatalytic efficiencies was proposed. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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hal-01434970 , version 1 (13-01-2017)

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H. Ait Ahsaine, M. Ezahri, A. Benlhachemi, B. Bakiz, Sylvie Villain, et al.. Novel Lu-doped Bi2WO6 nanosheets: Synthesis, growth mechanisms and enhanced photocatalytic activity under UV-light irradiation. Ceramics International, 2016, 42 (7), pp.8552-8558. ⟨10.1016/j.ceramint.2016.02.082⟩. ⟨hal-01434970⟩
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