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Effect of low-frequency oxygen plasma on polysulfone membranes for CO 2/CH 4 Separation

Modarresi, S ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1002/app.35623
  3. Publisher: 2012
  4. Abstract:
  5. Low-frequency O 2 plasma was used to modify the surface of polysulfone gas-separation membranes. The effects of the treatment time and plasma power input on the membranes were also investigated. Pure CO 2 and CH 4 gas-permeation measurements were performed before and after plasma treatment. The results show the increase of permeability of the treated membranes due to surface ablation and surface polarization up to 5.63 and 68.80 gas-permeation units for CH 4 and CO 2, respectively, whereas, the CO 2/CH 4 selectivity of the treated membranes varied from 7.7 to 45.3, depending on the treatment conditions. Attenuated total reflection-Fourier transform infrared spectroscopy determined the introduction of oxygen-containing polar groups on the surface of the membranes following treatment. Water contact angle measurements also showed a significant increase in the wettability of the membranes after plasma treatment. Furthermore, the morphology of the surface of the membranes was studied by scanning electron microscopy. The images displayed a gradual smoothness of the surface under mild treatment conditions
  6. Keywords:
  7. Gas permeation ; Gas separation membrane ; Low frequency ; Modification ; Oxygen plasmas ; Plasma power ; Plasma treatment ; Polar groups ; Polysulfone membranes ; Surface ablation ; Surface polarizations ; Transform infrared spectroscopy ; Treatment conditions ; Treatment time ; Water contact angle measurement ; Carbon dioxide ; Fourier transform infrared spectroscopy ; Membranes ; Oxygen ; Permeation ; Plasma applications ; Plasmas ; Polysulfones ; Scanning electron microscopy ; Separation ; Gas permeable membranes
  8. Source: Journal of Applied Polymer Science ; Volume 124, Issue SUPPL. 1 , 2012 , Pages E199-E204 ; 00218995 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/app.35623/abstract