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Designing a Continuous Photo-reactor using Semiconductor Nanoparticles for Wastewater Treatment

Mohammadi, Mohammad Moein | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44717 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian, Davood; Vossoughi, Manouchehr
  7. Abstract:
  8. In First part, the electrophoretic deposition method was utilized to immobilize TiO2 particles on stainless steel substrates. In addition, for the first time, statistics-based experimental design using response surface methodology (RSM) was employed to investigate the effect of four key coating parameters (i.e. applied voltage, calcination temperature, photocatalyst weight percentage, and deposition time) on the photocatalytic degradation. Analysis of variance revealed that the proposed model was adequate. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to evaluate the effects of the parameters on degradation efficiency. The optimum applied voltage, calcination temperature, catalyst concentration and deposition time were found to be 25 V, 300 oC, 1.0%w, and 300 s, respectively. Under these conditions, the degradation efficiency reached 85.88%. In the second part, TiO2 films prepared by optimum deposition conditions, were utilized in a continuous photo reactor. Effects of operating conditions such as recycle flow, initial concentration, and flow rate were observed. Increase in recycle flow had positive effect on photocatalytic degradation while increasing initial concentration and flow rate had negative effect. In addition, slurry and immobilized photo reactors were compared in the same conditions. As expected, slurry photo reactor showed higher efficiency
  9. Keywords:
  10. Titanium Dioxide ; Photocatalytic Oxidation ; Electrophoretic Deposition ; Experiments Design ; Photo-Reactor

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