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Author: search.filters.author.Boonyarattanakalin, KanokthipSubject: search.filters.subject.sonochemical process

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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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    Effects of Er Dopant on Structural and Optical Properties of BiVO4 Powders Prepared via Sonochemical Process
    (2022-01-01)
    Noinonmueng, Tanisara
    ;
    Kansaard, Thanophon
    ;
    Wechprasit, Tirapat
    ;
    Mekprasart, Wanichaya
    ;
    Boonyarattanakalin, Kanokthip
    In this work, we investigate the crucial effect of Er dopant on structural, morphological and optical properties of BiVO<inf>4</inf> prepared by one-step sonochemical process. The Er doping content was varied from 0% to 10%. The structural and morphological characterization were performed by X-ray diffraction technique (XRD), Raman spectroscopy and scanning electron microscopy. XRD and Raman spectra reveal the structural transition from monoclinic to tetragonal structure induced by Er dopant. Optical properties of the prepared samples were investigated by diffuse reflectance technique and the corresponding optical band gaps were calculated indicating two optical band gaps of two major phases of the doped samples. The Er dopant has highly influence on an enhancement in photocatalytic performance under visible irradiation of BiVO<inf>4</inf> as doping content is 8%. This improved performance could be due to the size reduction and morphological change due to phase transformation induced by Er dopant accompanying mixture of optical band gaps that can assist the retardment of electron-hole pair recombination.