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Effect of Nano Semiconductor Photocatalyst on Bacteria

Soleimani Salehabadi, Mehdi | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44391 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Vossoughi, Manouchehr
  7. Abstract:
  8. In the recent years, nanophotocatalytic process for E. coli inactivation has become considerable choice for water treatment. Having suitable catalytic characterizations, nanophotocatalysis could be considered as an alternative to current E. coli disinfections methods.
    In this study, antibacterial effect of Fe-Cd/TiO2 (TiO2 doped with Fe and Cd) under visible light was reported for the first time. The Results show that by comparing Fe-Cd/TiO2 with commercial TiO2 (P25 Degussa), bactericidal efficiency of this codoped photocatalysis under visible light is high and effective. Indeed, Nanoparticle of Fe-Cd/TiO2 disinfects E. coli (cell density: 107 CFU/ml) almost completely within 55 min under visible light. Furthermore, In order to optimize photocatalytic reaction conditions central composite design (CCD) was used, so the Design-Expert software was used for determining the optimum three parameters including pH, photocatalysis concentration and temperature. As a result, the proposed model provides adequate approximation of the real system. Moreover, antimicrobial effect of Fe-Cd/TiO2 and P25 Degussa were investigated on S.aureus as a gram-positive strain. Finally, Fe-Cd/TiO2 was coated on four different substrates including activated carbon, pumice stone ,glass beads and diatomaceous earth order to find efficient immobilized support. The results show that photocatalytic activity of actived carbon and diatomaceous earth are more efficient
  9. Keywords:
  10. Photocatalytic Bacterial Deactivation ; Coating on the Substrate ; Titanium Dioxide

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