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4582547 
Journal Article 
Improving CO2 permeability of ceramic hollow fibre-supported composite membranes by blending an ionic liquid in the Pebax/PEGDME selective layer 
Cheng, Jun; Hu, L; Li, Y; Ji, C; Zhou, J; Cen, K 
2016 
1 
RSC Advances
EISSN: 2046-2069 
6 
3 
2055-2064 
WOS:000368191100045 
To improve the permeation performance of a ceramic hollow fiber-supported poly (amide-b-ethylene oxide) (Pebax)/polyethylene glycol dimethylether (PEGDME) composite membrane during CO2 separation from biohydrogen, a room temperature ionic liquid (RTIL), namely, [P-66614][2-Op], with a high CO2 capacity, was adopted to blend in the selective layer. An RTIL-blended selective layer without defects was prepared on the surface of the ceramic hollow fibre. The physicochemical properties and CO2/H-2 separation performance of the Pebax/PEGDME/RTIL composite membrane were then compared with those of the Pebax/PEGDME composite membrane. Intermolecular hydrogen bonds were produced after blending RTIL with the Pebax/ PEGDME selective layer, and the surface roughness of the composite membrane increased. The CO2 permeation rate increased by similar to 35% and reached up to similar to 75 GPU at 50 degrees C, and the CO2/H-2 selectivity was maintained at a high value of similar to 15 at 30 degrees C. Blending RTIL with the selective layer inhibited the positive effect of CO2-induced plasticisation on H-2 permeability. However, this process improved CO2/H-2 selectivity in mixed gases relative to the ideal selectivity by enhancing competitive sorption among gas molecules.