Study on CO 2 /N 2 Mixture Gas Permeation Behavior through Polyethersulfone Membrane Treated by Plasma

The surface of polyethersulfone(PES) membrane treated by Ar, NH3 plasma, and the effects were observed before and after the treatment. The membrane treated by Ar plasma was increased the O/C ratio and measured the hydrophilic group, and the one by NH3 plasma was attached the amine group and the amino group. In addition, with the wettab ility of polyether- sulfone membrane CO 2 and the polar functional groups of surface interacted increasingly. Thus by comparable increase of the soluble selectivity CO2 to N2 both the permeability and the selectivity of CO 2 was improved. The optimum condition for the CO 2 permeation and actual separation factor of the plasma treated membrane was as follows; the measurement of Ar-10 W- 2 min plasma treatment was 13.19◊10 -10 cm 3 (STP)cm/cm 2 · s · cmHg and 20.12, and the measurement of NH3-50 W-2 min plasma treatment was 15.40◊10 -10 cm 3 (STP)cm/cm 2 · s · cmHg and 20.06.