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Synthesis of Solar Light Responsive Nanocatalysts and Investigation of their Performance in Water Splitting Reaction

Mokhtari, Negin | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55227 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Rahman Setayesh, Shahrbanoo
  7. Abstract:
  8. Today, fossil fuels cause countless environmental pollutants, so replacing fossil fuels with clean energy sources is very important. Water splitting using light and a semiconductor is one of the new methods of producing oxygen and hydrogen, which due to its simplicity and cheapness, has attracted a lot of attention today. In this study, ZnMn2O4 photocatalyst nanoparticles were first loaded on a graphitic carbon nitride support in different ratios of ZnMn2O4 and carbon support by hydrothermal method. Then the photocatalysts were evaluated for evolution of oxygen and hydrogen photocatalysts through water splitting under visible light. In ZnMn2O4 / g-C3N4 (80:20) nanocomposite, the highest amount of oxygen (dissolved oxygen) and hydrogen were produced, 52.8 μmol and 899.3 μmol, respectively. Then, elemental, morphological, optical and stability properties of ZnMn2O4, g-C3N4, ZnMn2O4 / g-C3N4 (80:20) using ICP, FT-IR, EDX, FE-SEM, XRD, DRS, PL and EIS methods were examined. According to the results of DRS analysis, the band gap of graphitic carbon nitride, ZnMn2O4 and the optimal nanocomposite were calculated to be 2.64 eV, 1.64 eV and 1.83eV respectively. The PL results also showed a decrease in the electron-hole recombination for the ZnMn2O4 / g-C3N4(80:20) nanocomposite. The effect of sacrificial agents also studied that in the reaction of oxygen production with the addition of the electron donor agent oxygen gas was not produced but in the presence of the electron acceptor agents for the first two hours, the oxygen production increased.
  9. Keywords:
  10. Water Splitting ; Oxygen Photocatalytic Evolution ; Hydrogen Photocatalytic Evolution ; ZnMn2O4 Photocatalyst ; Photosensitive Material ; Hydrothermal Method ; Visible Light Active Photocatalyst

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