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Author: search.filters.author.Ibrahim, Ammar

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    Anatase/Rutile TiO2 composite thin films prepared via dip coating technique and their hydrophilicity, stability and photocatalytic activity
    (2018-01-01)
    Ibrahim, Ammar
    ;
    Phoohinkong, Weerachon
    ;
    Mekprasart, Wanichaya
    ;
    Pecharapa, Wisanu
    In this work, titanium dioxide (TiO<inf>2</inf>) mixed-phase powders were prepared by sonochemical process in combination with calcination at different temperature in range of 400C to 1000C. The as-prepared powders were dispersed with tetraethyl orthosilicate (TEOS) as supported matrix of TiO<inf>2</inf> for homogeneous colloid and used as starting precursor for thin film coating. The designated thin films were deposited onto glass substrates by dip coating process. X-ray diffraction technique was employed to evaluate TiO<inf>2</inf> phase ratio meanwhile the film morphologies and hydrophilicity were investigated using scanning electron microscope and water contact angle, respectively. UV-Vis spectrophotometer was used to analyse the photcatalytic properties of the films. Photocatalytic activity of the prepared film was performed by mean of the decolorization of Rhodamine B dye solution under solar irradiation. The photocatalytic performance of assigned films was investigated and correlated mechanisms responsible for the activity are discussed.
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    CPC photocatalytic reactor in presence of immobilized tio 2 and photocatalytic activity
    (2017-07-01)
    Ibrahim, Ammar
    ;
    Phoohinkong, Weerachon
    ;
    Mekprasart, Wanichaya
    ;
    Pecharapa, Wisanu
    In this present work, compound parabolic collector (CPC) combined with tubular reactors was designed to accept both directly incident and reflected light. The light collecting of CPC reflecter was analysed via light reflection modeling. Titanium isopropoxide was used as a precursor to prepare immobilized titanium dioxide on the borosilicate beads which was used as supporter. The coated beads were prepared via dip coating technique. The photocatalytic activity of immobilized TiO <inf>2</inf> was performed to decolorize the Rhodamine B dye solution under solar irradiation. UV-Vis spectrophotometer was used to characterize the degradation of rhodamine B dye solution and to analyse the photocatalytic performance. The analysis of reflecting on CPC reflector indicates that all incidents are reflected to reactor tube according to the defined concentration ratio as equal one. The photodegradation of rhodamine B dye solution under solar irradiation is clearly observed by over 90% in presence of immobilized TiO <inf>2</inf> on glass beads.
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    Anatase/Rutile TiO2 composite prepared via sonochemical process and their photocatalytic activity
    (2017-01-01)
    Ibrahim, Ammar
    ;
    Mekprasart, Wanichaya
    ;
    Pecharapa, Wisanu
    In this work, Anatase/Rutile mixed-phase titanium dioxide (TiO<inf>2</inf>) composite powders prepared by sonochemical process which titanium (IV) isopropoxide (TTIP) were used as titanium precursor. The as-prepared powders were calcined at different temperature in range of 400 to 1000 °C. TiO<inf>2</inf> phase ratio was evaluated by X-ray diffraction technique. Phase transformation of anatase to rutile phase in TiO<inf>2</inf> powder was initially obtained by calcined sample at 600 °C. The complete rutile phase was completely occurred at calcination temperature at 800 °C. Photocatalytic activity by TiO<inf>2</inf> photocatalysts was analyzed via the decolorization of Rhodamine B dye solution under LED white light irradiation. Anatase/Rutile composite with properly ratio in TiO<inf>2</inf> photocatalyst calcined at 700 °C performed the highest photocatalytic activity due to the enhancement of charge transfer at mixed phase interface and the decrease of electron-hole pair recombination.