Surface Modification of Polysulfone Membrane by Plasma Treatment for CO2/CH4 Separation

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Modarresi, Siamak | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41481 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Soltanieh, Mohammad
Abstract:
Low frequency (LF) O2 plasma was used to modify the surface of polysulfone (PSF) gas separation membranes. The effect of treatment time and plasma power input on the membranes was also investigated. Pure CO2 and CH4 gas permeation measurements were performed before and after plasma treatment. The results showed the increase of permeability of the treated membranes due to surface ablation and surface polarization. However, the CO2/CH4 permselectivity of the treated membranes varied from 7.7 to 45.3 depending on the treatment conditions. Attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy determined the introduction of oxygen containing polar groups on the surface of the membranes following treatment. Water contact angle measurements also showed the 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 (SEM). The images displayed gradual smoothness of the surface at mild treatment conditions
Keywords:
Carbon Dioxide Separation ; Surface Modification ; Polysulphone Membrane ; Low Frequency Plasma

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