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Investigation of Vanadium Dopant and SiO2 Prelayer on the Self-Cleaning Property of TiO2 Coatings by Sol-Gel Dip Coating Method

Namkhah, Yalda | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42762 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Faghihi Sani, Mohammad Ali
  7. Abstract:
  8. Because of limitation of titania coating that can act as self-cleaning surface under UV light irradiation, introduction of transition metal ions into titania lattice can decrease band gap energy of titania in order to activate the coating under visible light irradiation. In this research, by using vanadium element and silica prelayer, a titania coating was deposited on the soda-lime glass substarte to produce self-cleaning surface. The scope of coating was to increase the photocatalytic activity and hydrophilicity of vanadium doped titania coating on the soda-lime glass and silica coated glass by sol-gel dip coating method. XRD and FTIR analysis were done on the powders with different calcination processes. Morphology and thickness of the single and double layer coatings were analyzed using SEM. Surface topography of the coating was also investigated by AFM. Hydrophilicity of coatings was determined by measuring cantact angle of water drop with surface. The photocatalytic activity of vanadium doped titania coatings was evaluated by measuring degradation rate of equeous methyl orange (MO) as well as stearic acid and PVA under UV irradiation. Results represented that by increasing vanadium up to 0.15%, the highest degradation rate of MO was obtained under UV irradiation after 2 hours. It was also observed that with the silica prelayer, the photocatalytic activity was improved in all amounts of vanadium dopant.

  9. Keywords:
  10. Vanadium ; Sol-Gel Method ; Photocatalytic Activity ; Band Gap ; Titanium Oxide Coating

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