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Surface Modification of Polyethersulfone Membrane by Plasma Treatment for Gas Separation

Dehghani Kiadehi, Atena | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42452 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Soltanieh, Mohammad
  7. Abstract:
  8. In this study, the effects of treatment time and power of Low-frequency (LF) O2 plasma has been investigated for the surface treatment of polyethersulfone (PES) gas separation membranes. PES membranes prepared using dry/wet phase inversion using ternary mixtures containing 1-methyl-2-pyrrolidone (NMP) as solvent, water as non-solvent. The optimum polymer concentration was 32 wt.% , 61 wt.% and 7 wt.% for PES,1-methyl-2-pyrrolidone and water respectively. Pure CO2 and CH4 gas permeation measurements were performed before and after plasma treatment. After treatment gas permeances of around 0.81 GPU for CO2, and 0.073 GPU for CH4 with selectivities of around 11.23 for CO2/CH4 were obtained. After treatment, Attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectrum and Contact angle measurement, determined the introduction of oxygen containing polar groups on the surface of the membrane and wettability of surface, respectively. The morphology of the membranes was studies by scanning electron microscopy (SEM) and atomic force microscopy (AFM). It was found that the surface structure was fairly different from that of the untreated membrane. The results clearly demonstrated that a plasma treated PES membrane with 15 Watt and 90 s, has the smoothest surface
  9. Keywords:
  10. Gases Separation ; Phase Inversion ; Polyethersulphone Membrane ; Plasma Surface Modification

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