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Subject: search.filters.subject.Synthetic rutile

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    Photocatalytic properties and plastic degradation of TiO2 nanocomposite with synthetic-rutile from natural ore
    (2018-01-01)
    Mekprasart, Wanichaya
    ;
    Thongpradith, Titarat
    ;
    Pecharapa, Wisanu
    ;
    Ishihara, Keiichi N.
    Titanium dioxide (TiO<inf>2</inf>) is considered a main material in energy and environment fields. This work focused on the production of synthetic rutile-TiO<inf>2</inf> (LA) material from natural ore by milling-ultra sonic assisted in acid treatment. Modified-TiO<inf>2</inf> nanocomposite of synthetic rutile and anatase nanopowder was synthesized by high energy milling process. After milling process, the average sizes of samples were decreased at 30% as calculated from XRD peaks. The band gap value of samples analyzed by UV-Vis spectrometer showed that the decrease of the band gap in LA composite at 3.34 eV might be associated with the presence of rutile phase in anatase matrix relating to the highest photocatalytic activity under visible light illumination. Polyethylene plastic was supplemented with different LA nanocomposite loading by thermal attachment process. Photocatalyst property of LA nanocomposite was investigated photocatalytic activity under Xe lamp illumination and investigated by FTIR and XRD technique. The optimized content of LA nanocomposite was performed at 2 wt.% in PE film. FTIR patterns did not detect the difference of plastic degradation. However, the significant change in PE crystalline monitored by XRD technique confirmed the decrease of crystallite size by peak shifted position and size decreasing at 10% by photocatalyst effect.
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    Hydrophilic and photocatalytic properties of dip-coated synthetic rutile-based thin films derived from minerals ores
    (2018-01-01)
    Kansa-Ard, Thanaphon
    ;
    Yimwan, Wadweaw
    ;
    Poohinkong, Weerachon
    ;
    Mekprasart, Wanichaya
    ;
    Sanguanpak, Samunya
    This article focuses on the investigation of hydrophilic property and photocatalytic activity of synthetic rutile-based thin films prepared by conventional dip coating method. The synthetic rutile was prepared by chloride leaching process for purification of synthetic rutile from mineral ores and was coated on glass substrate with binder for several times to reach designated thickness. UV-Visible spectroscopy technique was employed to study relevant optical properties meanwhile the crystalline structure of synthetic rutile-based thin films was characterized by X-ray diffraction. Surface morphologies of the coated films were monitored by scanning electron microscope while hydrophilic property was observed by contact angle measurement. Photocytalytic activity was evaluated by mean of the degradation of organic dye Rhonamine B under ultraviolet light and visible light. The improvement of photocatalytic efficiency was obtained by synthetic rutile-based thin film under visible irradiation compared with reference film without leached phtocatalyst.