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Synthesis and Characterization of Structured Nanocatalysts and Their Applications in Kinetics Study of Oxidation-reduction Reactions

Akbarzadeh Ferdosiehnezhad, Elham | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 50566 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Gholami, Mohammad Reza; Rahman Setayesh, Shahbanoo
  7. Abstract:
  8. In present study, various cocatalysts were used to improve catalytic properties of metal oxides and oxy-acids. Ag3VO4/Ag3PO4/Ag and Cu2O/MoS2/rGO photocatalysts were synthesized. The photocatalytic activities of the prepared nanocomposites were evaluated by the photodegradation of dye in the heterogenous systems as a series of advanced oxidation reactions. The results revealed that heterojunction between two semiconductors may prevent fast electron-hole pair recombination and then improve efficiency and rate of dye photodegradation. Mechanism and kinetics of dye degradation were studied in the presence of new photocatalysts by using of different scavengers. In the other works, Pt-NiO/G and M(Ag, Au)/CuO nanocomposites were prepared. Reduction of 4-NP in the presence of NaBH4 was used to investigate catalytic properties of nanocomposites. The results demonsterated that adding a little amount of noble metal nanoparticles exhibits noticeably an improvement in catalytic activity of metal oxides. Mechanism of the reduction reaction was discussed with respect to the structures of used catalysts. In the other study, cocatalytic role of molecular molybdenum sulfide was investigated on photocatalytic activity of carbon nitride materials. Photocatalytic activity of as prepared nanocomposite was investigated in hydrogen evolution reaction. Photocatalytic results suggested that molybdenum sulfide nanoclusters can accept photo-induced electrons of the carbon nitride surface. Nanoclusters prevent fast electron-hole pair recombination and improve photocatalytic activity of carbon nitride. On the other hand, all of the sulfur atoms of the cluster act as active hydrogen generation sites. This study showed that molybdenum sulfide nanoclusters could be a suitable alternative for platinum in photocatalytic hydrogen evolution reaction
  9. Keywords:
  10. Nanocomposite ; Hydrogen Evolution Reaction ; Photocatalyst ; Kinetics Study ; Oxidation-Reduction Reaction ; Cocatalyst

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