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Author: search.filters.author.Kansaard, ThanaphonSubject: search.filters.subject.nanocomposites

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    Er-Doped BiVO4/BiFeO3 Nanocomposites Synthesized via Sonochemical Process and Their Piezo-Photocatalytic Application
    (2024-06-01)
    Kansaard, Thanaphon
    ;
    Songpanit, Maneerat
    ;
    Noonuruk, Russameeruk
    ;
    Wattanawikkam, Chakkaphan
    ;
    Mekprasart, Wanichaya
    In this work, Er-doped BiVO<inf>4</inf>/BiFeO<inf>3</inf> composites are prepared using the sonochemical process with a difference of rare earth loading compositions. The crystallinity and chemical and morphological structure of as-synthesized samples were investigated via X-ray diffraction, Raman scattering, and electron microscopy, respectively. The diffuse reflectance technique was used to extract the optical property and calculate the optical band gap of the composite sample. The piezo-photocatalytic performance was evaluated according to the decomposition of a Rhodamine B organic compound. The decomposition of the organic compound was achieved under ultrasonic bath irradiation combined with light exposure. The Er-doped BiVO<inf>4</inf>/BiFeO<inf>3</inf> composite heterojunction material exhibited significant enhancement of the piezo-photocatalytic activity under both ultrasonic and light irradiation due to the improvement in charge generation and separation. The result indicates that Er dopant strongly affects the phase transformation, change in morphology, and alternation in optical band gap of the BiVO<inf>4</inf> matrix. The incorporation of BiFeO<inf>3</inf> in the composite form with BiVO<inf>4</inf> doped with 1%Er can improve the photocatalytic performance of BiVO<inf>4</inf> via piezo-induced charge separation and charge recombination retardment.
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    Characterization and Visible Light-Driven Photocatalytic Activity of BiVO4/BiOCl/Bi2S3 Nanocomposites Prepared by Sonochemical Process
    (2023-05-01)
    Kansaard, Thanaphon
    ;
    Ishihara, Keiichi N.
    ;
    Pecharapa, Wisanu
    Photodecomposition performance enhancement of BiVO<inf>4</inf> is carried out by combining it with compatible semiconductors, such as bismuth oxyhalides and sulfide-based photocatalyst materials. In this article, the synthesis of BiVO<inf>4</inf>/BiOCl/Bi<inf>2</inf>S<inf>3</inf> is carried out by a one-step sonochemical process at room temperature with various S:Bi mole ratios (1:9, 2:8, and 3:7). The crystallinity and morphological features of the synthesized powders display a BiVO<inf>4</inf> monoclinic phase accompanied by BiOCl tetragonal and Bi<inf>2</inf>S<inf>3</inf> orthorhombic phases. Field-emission electron microscopy micrographs show an irregular shape with various particle sizes and layering with the characteristic shape of BiOCl. The optical bandgap of the composites has various values in the range of 1.3–3.3 eV. The best photocatalytic performance is observed for the 2–8 composite sample, which produced complete degradation of RhB, with k = 0.17 min<sup>−1</sup>, after 20 min of visible light exposure.