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Physicochemical and Photocatalytic Properties of Fe, Gd and P Doped TiO2 Nanoparticles

Adyani, Mohsen | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45504 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad
  7. Abstract:
  8. Improving the photocatalytic activity of titania nanoparticles and Cognition the mechanisms governing this property, has received more attention in the recent few years. One of the main strategies for improving the photocatalytic activity and modifying the bandgap structure of titania nanoparticles, is incorporation different metallic and nonmetallic ions in the titania lattice. In this study, 1%Fe, 1%Gd and 2%P (molar ratio) doped titania nanoparticles were successfully prepared by a modified sol-gel method in room temperature. The products were characterized with various spectroscopic and analytical techniques to determine their structural, morphological, physicochemical and photocatalytic properties, including X-ray diffraction, energy dispersive X-ray spectroscopy, N2 physical adsorption– desorption, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, UV–Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy and electrochemical impedance spectroscopy. The photocatalytic activity of samples were determined by photo degradation of methyl orange as a pollutant model under both UV and Visible light irradiation. Effects of each dopant ions on the different properties of prepared nanoparticles were investigated. The results indicated that Fe, Gd and P-tridoped TiO2 with band gap of 2.71 and 83 specific surface aria and MO degradation rate of 80% and 85%, with constant rate of 2.1 and 4.6 respectively in visible and UV light irradiation, exhibited the highest photoactivity not only under UV light irradiation but also under Visible light irradiation among all undoped and single doped samples, which should ascribed to a synergetic effect of actions played by Fe, Gd and P. The possible synergetic mechanism for photocatalysis was also discussed. The high photocatalysis performance of the Fe, Gd and P-tridoped anatase TiO2 sample, with high surface area and mesoporous structure, which lead to facilitate the transportation, adsorbance and degradation of dye molecules on the surface of the nanoparticles, make it a good choice for photocatalytic applications such as dye elimination from Aqueous environments.
  9. Keywords:
  10. Titania ; Photocatalyst ; Sol-Gel Method ; Band Gap ; Doping ; Heterogeneous Reactions

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