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The Application of Nano Scale Iron Particle in Water Treatment

Nikroo, Razieh | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45220 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Alem zadeh, Iran; Vosoughi, Manouchehr
  7. Abstract:
  8. Chlorinated hydrocarbons such as trichloroethylene form a kind of dense non-aqueous phase liquid contaminants in groundwater and soil that are so difficult to remediate. In recent years, many field research has been demonstrated application of nano scale zero valent iron can degrade these contaminants.
    In this research, nZVI particle synthesized by liquid phase reduction method. Nickel (25%wt ) has been added to increase the reduction rate and also reduce intermediate pollutions. However, the combination of a noble metal to nZVI, leads to more rapid oxidation and tendency to agglomeration. So nZVI particles coated by applying a water soluble-starch solution (0.4%wt) as a stabilizer. The starched nanoparticle displayed much less agglomeration and remained suspended in water for hour while the bare nZVI precipitated within minutes.
    SEM and DLS analyses indicated that the bare nZVI particles synthesized by this method rapidly developed a core-shell structure and also indicated the mean particle size was reduced by starch coating. The mean particle size was estimated to be about 70 nm and the starched nZVI were present as discrete particles and the mean particle size was about 30 nm.
    In second section of work, investigating of degradation of TCE by application of synthesized nano particle was done. The effects of some important parameters were studied; such as initial concentration of TCE, Fe loading, pH and operation time. Degradation reactions monitored by GC-Mass analyzer. All experiments designed and also analyzed by Design expert software
  9. Keywords:
  10. Water Treatment ; Organic Pollutant ; Stabilization ; Experiments Design ; Iron Nanoparticle ; Stability

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