Membrane and Water Treatment

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Characterization and performance of post treated PVDF hollow fiber membrane

  • Eman S. Sayed (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre) ;
  • Hayam F. Shaalan (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre) ;
  • Magda I. Marzouk (Organic Chemistry Department, Faculty of Science, Ain Shams University) ;
  • Heba A. Hani (Chemical Engineering and Pilot Plant Department, Engineering and Renewable Energy Research Institute, National Research Centre)
  • Received : 2023.08.03
  • Accepted : 2024.07.09
  • Published : 2024.04.25
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Abstract

Modification of Polyvinylidene fluoride (PVDF) hollow fiber membranes (HFMs) characteristics and performance were investigated via post treatment using different oxidants. sodium hypochlorite (NaOCl), hydrogen peroxide (H2O2) and potassium persulfate (KPS). Fourier transform infrared (FTIR) and Proton nuclear magnetic resonance (1H-NMR) results revealed no structural differences after post treatment. Cross-sectional micrographs show finger-like structures at the outer and inner walls of the HFMs and sponge-like structures in middle, where NaOCl and KPS post treated fibers exhibited a decrease in finger-like structures in addition to aggregates appearing on the surface, consequently leading to an increase in the surface roughness (Ra) from 48 nm to 52.8nm and 56 nm, respectively. Hydrogen peroxide post treatment only was observed to decrease the water contact angle from 98° to 81.4°. It was also observed that the elongation at break and the modulus deceased after NaOCl post treatment from 34.5 to 28.5% and from 19.3 Mpa to 16.6 Mpa, respectively. Moreover, pure water flux after H2O2 post treatment increased from 87.8 LMH/bar to 113 LMH/bar at 0.45 bar, while no changes were detected for the methylene blue dye rejection (74%) between raw and hydrogen peroxide post treated fibers at the same pressure. According to the findings hydrogen peroxide post treated PVDF HFMs have the most uniform surfaces, with almost no alterations in structural and mechanical properties or porosities with enhanced hydrophilicity and pure water flux maintaining appropriate rejection. Therefore, it is considered an efficient surface modifying agent for UF/NF membranes or low-pressure separators.

Keywords

Acknowledgement

The authors would like to thank the Ministry of International Cooperation for securing funds to initiate and support the Hollow Fibre Membranes Program at the National Research Centre from the Islamic Development Bank and Kuwait fund for Arab Economic Development.

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