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Chemical Oxygen Demand (COD) Reduction of Wastewater using Membrane Technology Coupled with Advanced Oxidation Process (AOPs)

Filsara, Mahdi | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58136 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Musavi Saghandikalayi, Abbas
  7. Abstract:
  8. In this study, an electroactive membrane with a PES substrate and coating layers of CNT-COOH, FeOCl nanoparticles, and polyaniline (PANI) was designed and synthesized to investigate its performance in the removal of the antibiotic ciprofloxacin and the reduction of the chemical oxygen demand (COD) pollution index from water. To evaluate the membrane’s structure and performance, characterization tests including FTIR, XRD, SEM, EDX-Mapping, contact angle measurement, four-point probe conductivity, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were employed.The results showed that surface modification significantly improved the physical properties and performance of the membrane. The contact angle increased from 108° for PES to 131.7° for the final membrane, indicating increased surface hydrophilicity due to structural modification. Surface resistance decreased from 265.18 Ω/sq for CNT-COOH to 48.18 Ω/sq for PANI@CNT/FeOCl, reflecting enhanced electrical conductivity due to the presence of polyaniline. Flux tests showed that adding conductive layers initially reduced the flux to 469.82 L/m²•h, but applying a 3 V voltage increased the flux to 600.82 L/m²•h, demonstrating the positive role of the electric field in enhancing membrane permeability.Additionally, the flux recovery ratio (FRR) improved from 55.4% for the PES membrane to 86.7% for the final membrane, indicating reduced adhesion and fouling on the membrane surface and better cleaning capability. Electrochemical tests (CV and EIS) also revealed increased electrocatalytic activity of the membrane; the enhanced oxidation-reduction peak currents in CV and the reduced series and charge transfer resistance in the Nyquist plot confirmed the positive effect of combining FeOCl and PANI.Ultimately, the designed membrane achieved 94.84% removal of ciprofloxacin and a 69.3% reduction in COD. These results indicate that the electroactive PANI@CNT/FeOCl membrane, with its effective nanostructure composition and response to electrical stimulation, is a promising option for advanced treatment of water contaminated with pharmaceutical pollutants
  9. Keywords:
  10. Carbon Nanotubes ; Organic Pollutant ; Electro-Fenton Method ; Chemical Oxygen Demand (COD) ; Electroactive Membrane ; Advanced Oxidation Process

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