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The Investigation of Photocatalytic Properties of Palladium-Modified TiO2 Coating via Sol-Gel Method

Rezaiyan Deloei, Mehdi | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39228 (07)
  4. University: Sharif University of Technology
  5. Department: Material Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad
  7. Abstract:
  8. Titanium dioxide has helped mankind to eliminate some viruses, bacteria and fungi due to its photocatalytic activity. Despite the unique properties of this semiconductor, the recombination of the produced electron hole pairs by UV is a restrictive factor of its photocatalytic efficiency. The doping of some noble metals and cations of transition metals with this oxide can increase its photocatalytic efficiency. In this research, palladium-modified TiO2 coating was prepared by using dip-coating method. The investigation of XRD spectrum demonstrated that 1%wt addition of Pd to TiO2 sol-gel solution results in a 16.1% decrease of Rutile phase, compared with TiO2 sol-gel solution which was not modified by Pd; besides, this amount of Pd decreases the rate of Anatase phase crystallization on (101) plane by 40%. Furthermore, the study of linear sweep voltametry (LSV) diagrams of the coating revealed that the coating which contained 1%wt Pd had the best photocatalytic efficiency. The analysis of these two-layers-coating diagrams displayed that more output current was produced when first TiO2 doped by Pd layer and then TiO2 layer was coated compared with the time when first TiO2 layer and then TiO2 doped by Pd layer was coated. The administration of antibacterial test against E.coli -a gram negative bacterium- for the coating which had 0.5%wt Pd showed a 35% increase in antibacterial properties of the coating after 1 hour, compared with the specimen which was not modified by Pd.
  9. Keywords:
  10. Sol-Gel Method ; Titanium Dioxide ; Palladium ; Photocatalyst ; Antibacterial Test

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