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Synthesis and Photocatalytic Performance Study of Ag/Polydopamine Graphitic Carbon Nitride Nanocomposite

Shahsavandi, Faezeh | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54809 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Madaah Hosseini, Hamid Reza
  7. Abstract:
  8. Developing an efficient visible-light-driven photocatalyst is believed to be a practical solution for clean energy and environmental remediation. The present study aimed to broaden current knowledge of the graphitic carbon nitride (g-C3N4)-based plasmonic photocatalysts by decorating polydopamine-grafted g-C3N4 (PDA/g-C3N4) with silver nanoparticles (AgNPs). The ternary nanocomposite was prepared using a facile synthesis method, while XPS and electron microscopy measurements confirmed the homogenous dispersion of AgNPs on PDA/g-C3N4. It was revealed that AgNPs successfully reduced the recombination rate of photoinduced electron-hole charge carriers. The calculated bandgap energy was decreased from 2.7 eV for pure g-C3N4 to 2.1 eV for AgNPs/PDA/g-C3N4 nanocomposite. The developed AgNPs/PDA/g-C3N4 nanocomposite showed superior performance in degrading methylene blue (MB) up to 96% in less than two hours which is 6 and 3 times faster than g-C3N4 and PDA/g-C3N4, respectively. The developed photocatalyst maintained this performance even after four successive runs, which proves its excellent chemical stability. The kinetics of the degradation reaction was modeled using pseudo-first-order kinetics with a high-rate constant of 0.022 min-1. The plasmon-enhanced photocatalyst showed promising performance for the degradation of organic pollutants using a low-power lamp with potential application in environmental remediation
  9. Keywords:
  10. Graphitic Carbon Nitride ; Silver Nanoparticles ; Photocatalytic Degradation ; Visible Light ; Polydopamine

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