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Author: search.filters.author.Thiwawong, ThutiyapornSubject: search.filters.subject.calcium oxide

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    Preparation of calcium oxide/graphitic carbon nitrides (CaO/g-C3N4) composite for photocatalyst dye degradation
    (2024-06-01)
    Chaisrisongkram, Chinanun
    ;
    Thiwawong, Thutiyaporn
    ;
    Onlaor, Korakot
    ;
    Tunhoo, Benchapol
    Dye degradation properties of composited calcium oxide (CaO) and graphitic carbon nitride (g-C<inf>3</inf>N<inf>4</inf>) were studied. The CaO and g-C<inf>3</inf>N<inf>4</inf>nanoparticles were derived under separate thermal calcination processes from eggshells and melamine, respectively. Physical properties of the synthesized CaO and g-C<inf>3</inf>N<inf>4</inf>were investigated by X-ray diffractometry (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The synthesized CaO and g-C<inf>3</inf>N<inf>4</inf>nanoparticles were, then, composited at various concentrations, and the photocatalytic behaviors of the composited samples were investigated in an aqueous solution of methylene blue, with a irradiation source of 220 W white light-emitting diode lamp. Results showed that the optimal ratio of the composite material for dye degradation was 10% CaO:90% g-C<inf>3</inf>N<inf>4</inf>, giving 95.89% degradation efficiency with an exposure time of 15 min and degradation rate of 0.1727 min-1.
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    Electrical Properties of Eggshell-Derived CaO Composited with Polyvinylpyrrolidone for Bistable Device
    (2022-01-01)
    Tunhoo, Benchapol
    ;
    Onlaor, Korakot
    ;
    Songkeaw, Potiyan
    ;
    Sriyapan, Jaturon
    ;
    Thiwawong, Thutiyaporn
    In this work, bistable devices were fabricated from eggshell-derived calcium oxide (CaO). CaO powders can be obtained from the calcination of chicken eggshells at temperatures from 700-1000 °C. The properties of derived CaO were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy. CaO was composited with polyvinylpyrrolidone (PVP) polymer to fabricate a bistable device with the device structure of ITO/PVP:CaO/Al. The maximum ON/OFF current ratio for the device was approximately 10<sup>4</sup>. In addition, the retention time operations reached higher than 10<sup>4</sup> s, which revealed the stability of the bistable device. The theoretical model and conduction mechanisms were presented to explain the behavior of the bistable device.