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Fabrication and Modification of Nano-Filtration Membrane for Effective Removal of Pharmaceutical Pollutants from Water

Noori Keshtkar, Maryam | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57263 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Musavi Soghondikolaei, Abbas; Bastani, Dariush; Molavi, Hossein
  7. Abstract:
  8. In this research, the separation of tetracycline (TC) as a pharmaceutical pollutant from water using a nanofiltration membrane process was investigated. For this purpose, a set of polymer-based nanofiltration membranes containing various amounts of the metal-organic framework (MOF-808) which are stable in water, were prepared via the phase inversion method. Due to the hydrophobic nature of the polysulfone and its tendency to fouling in the membrane filtration process, MOF-808 particles were used as agents to enhance the hydrophilicity of the membrane surfaces. In order to achieve this goal, MOF-808 was synthesized via solvothermal method and activated using two different methods: centrifugation and Soxhlet extraction. To ensure the accuracy of the synthesis method, characterizations including FTIR, XRD, BET, and SEM analyses were conducted on the aforementioned metal-organic framework. Based on these analyses, MOF-808 was found to possess octahedral shape. Subsequently, the adsorption performance of MOF-808 for the removal of tetracycline pollutant from water was examined. The activated metal-organic framework by Soxhlet extraction (S-MOF-808) demonstrated superior adsorption performance with an equilibrium adsorption capacity of 283.64 mg.g-1 due to its high specific surface area. Thus, the activated MOF-808 through this method was identified as an optimized metal-organic framework and utilized as an agent to enhance the hydrophilicity of the membrane surfaces. Following that, S-MOF-808 particles were incorporated into polysulfone matrix in varying percentages (0.5% to 1% by weight) to prepare composite membranes. The separation performance of the prepared membranes was evaluated using pure water permeation flux, tetracycline antibiotic rejection, and anti-fouling properties. The results and analysis of contact angle measurements and SEM analysis indicate that with an increase in S-MOF-808 particles, the permeation flux and rejection rate increased, which continued up to the membrane containing 1% by weight S-MOF-808. However, with further increase up to 1.5% by weight, due to the considerable increase in surface hydrophilicity and pore size of the membrane, the permeation flux and rejection rate decreased. Ultimately, the membrane containing 1% by weight was selected as the optimal membrane, showing a four-fold increase in permeation flux and an increase in tetracycline rejection from 94% to 97% compared to the pure polysulfone membrane. Additionally, by comparing the anti-fouling properties of the pure polysulfone membrane with the optimized one, it was observed that an increase in S-MOF-808 particles significantly enhanced the recovery ratio of permeated flux and improved the membrane performance
  9. Keywords:
  10. Metal-Organic Framework ; Nanofiltration Membrane ; Water Treatment ; Tetracyclines ; Adsorption

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