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Hupka, Jan
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article
Enhanced visible light photocatalytic activity of Pt/I-TiO2 in a slurry system and supported on glass packing
Abstract
<p>Highly photoactive I/TiO<sub>2</sub>, Pt/I-TiO<sub>2</sub> nanocomposites were obtained using a hydrothermal and wet impregnation method. The incorporation of iodine and modification with 0.05 mol% of platinum leads to enhanced photocatalytic activity as compared to singly doped TiO<sub>2</sub> due to the presence of impurity energy level in the structure of TiO<sub>2</sub>. X-ray diffraction, TEM microscopy, UV–Vis spectroscopy, X-ray photoelectron spectroscopy and BET methods showed that the most active photocatalyst had anatase structure, 187 m<sup>2</sup>/g specific surface area, absorbed UV–Vis light and contained 3 nm platinum particles. XPS analysis revealed that iodine exists in the form of I<sup>¯</sup> and IO<sub>3</sub><sup>¯</sup> species and platinum was present as Pt and PtO<sub>2</sub>. The photocatalytic activity of Pt/I-TiO<sub>2</sub> nanocomposite was maintained after 4 runs, suggesting stability and reusability of the obtained photocatalyst. The efficiency of degradation of model organic compound was measured in a slurry type photoreactor as well as in a fixed-bed photoreactor equipped with parabolic mirror with Pt/I-TiO<sub>2</sub> immobilized on glass beads or glass Raschig rings.</p>