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Author: search.filters.author.Mekprasart, W.Subject: search.filters.subject.A. Composites

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    Ball-milled CuPc/TiO 2 hybrid nanocomposite and its photocatalytic degradation of aqueous Rhodamine B
    (2012-11-01)
    Mekprasart, W.
    ;
    Vittayakorn, N.
    ;
    Pecharapa, W.
    Hybrid composites of titanium dioxide and copper phthalocyanine were synthesized by ball-milling assisted process in combination with mechanically stirring method. Structural properties of as-synthesized composites were characterized by X-ray diffraction (XRD), X-ray absorption fine structure (XANES) and scanning electron microscope (SEM). The optical absorbance of as-prepared composites and their photocatalytic activities were investigated by UV-vis spectroscopy. XRD and XANES results confirm that CuPc/TiO <inf>2</inf> nanocomposite is still in the same structure of TiO <inf>2</inf> and CuPc. SEM result reveals that the decreasing particle size of ball-milled CuPc has good dispersion on the surface of TiO <inf>2</inf>. Absorptivity in UV region of the composites is heightened and shifted to visible light due to strong absorbance in blue-green spectrum of CuPc. The photocatalytic degradation of Rhodamine B dye solution using as-synthesized composites was investigated under ultraviolet irradiation. The optimized condition for RhB photodegradation was obtained for 1 wt.% CuPc/TiO <inf>2</inf> nanocomposite with efficiency of 87.5% and reaction rate of 0.15 min <sup>-1</sup>. The significant improvement in photocatalytic activity of the hybrid composite may be associated to the enhancement of optical absorption and the inhibition of electron-hole recombination caused by the presence of CuPc in TiO <inf>2</inf> matrix. © 2012 Elsevier Ltd. All rights reserved.