Vahid Jabbari - Efficient visible-light-induced photocatalytic degradation of MO on the Cr–nanocrystalline titania–S

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  Publication Details (including relevant citation   information):

  Applied Surface Science 257 (24), 10639-10644


  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.

  Address (URL): doi:10.1016/j.apsusc.2011.07.063