Abstract
Abstract Highly photoactive I/TiO 2 , Pt/I-TiO 2 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 2 due to the presence of impurity energy level in the structure of TiO 2 . 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 2 /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 ¯ and IO 3 ¯ species and platinum was present as Pt and PtO 2 . The photocatalytic activity of Pt/I-TiO 2 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 2 immobilized on glass beads or glass Raschig rings.
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