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Photocatalytic Degradation of Pharmaceutical Pollutants using Composites Derived from Layered Double Hydroxides and Metal-Organic Frameworks

Hosseini, Ali | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58070 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad; Khorasheh, Farhad; mohammadi, Alireza
  7. Abstract:
  8. The aim of this study is to remove pharmaceutical pollutants through a photocatalytic approach. A layered double hydroxide (LDH) structure was synthesized with the assistance of a metal-organic framework (MOF). Initially, MIL-101(Cr) was synthesized using trivalent chromium ions and subsequently transformed into a layered double hydroxide structure with divalent nickel ions. To further enhance this process, MIL-88(Fe) was prepared using trivalent iron ions, composited with MIL-101(Cr), and then converted into an LDH structure using divalent nickel ions. The resulting photocatalytic composite was fully characterized, and its efficiency in degrading the pharmaceutical compound meropenem was evaluated. Reaction variable studies indicated that under optimized conditions (pH 6.7, 0.05 g of catalyst, initial drug concentration of 25 ppm, and ambient temperature), the degradation efficiency of meropenem reached 96.05% for Ni-MCr LDH and 98.12% for Ni-[MCr/MFe] LDH. Kinetic and thermodynamic parameters of the reaction were determined, and the data were fitted to various adsorption isotherms, revealing that the photocatalytic degradation of meropenem followed pseudo-first-order kinetics and the Temkin isotherm. Additionally, a chemical mechanism for the degradation process was proposed. Finally, the Ni-MCr LDH photocatalyst demonstrated reusability, maintaining activity with only a 6% reduction after five consecutive cycles, while the Ni-[MCr/MFe] LDH showed a 5% reduction in efficiency under similar conditions
  9. Keywords: