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Efficient visible-light-induced photocatalytic degradation of MO on the Cr-nanocrystalline titania-S |
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| Authors: | Masood Hamadanian Ali Sadeghi SarabiAli Mihammadi Mehra Vahid Jabbari |
| Institution: | a Institute of Nanosciences and Nanotechnology, University of Kashan, Kashan, Iran b Department of Physical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran c Department of Chemistry, Faculty of Sciences, Lorestan University, Lorestan, Iran |
| Abstract: | In order to improve visible light photocatalytic activities of the nanometer TiO2, a novel and efficient Cr,S-codoped TiO2 (Cr-TiO2-S) photocatalyst was prepared by precipitation-doping method. The crystalline structure, morphology, particle size, and chemical structure of Cr-TiO2-S were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR) techniques, respectively. Results indicate that the doping of Cr and S, cause absorption edge shifts to the visible light region (λ > 420 nm) compare to the pure TiO2, reduces average size of the TiO2 crystallites, enhances desired lattice distortion of Ti, promotes separation of photo-induced electron and hole pair, and thus improves pollutant decomposition under visible light irradiation. The photocatalytic activities of Cr-TiO2-S nanoparticles were evaluated using the photodegradation of methyl orange (MO) as probe reaction under the irradiation of UV and visible light and it was observed that the Cr-TiO2-S photocatalyst shows higher visible photocatalytic activity than the pure TiO2. The optimal Cr-TiO2-S concentration to obtain the highest photocatalytic activity was 5 mol% for both of Cr and S. |
| Keywords: | Cr-TiO2-S nanoparticle Visible light Photocatalyst MO decomposition |
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