Abstract
Asymmetric polycarbonate (PC)/metal salt complex membranes were prepared by a wet phase inversion method utilizing the complex structure to improve gas separation performance. The effects of PC content in the casting solution, kind of added metal salts, coagulation medium on membrane formation, morphology, and gas separation performances of the complex membranes are reported. The PC/DMF/metal salt complex structure is characterized by FTIR and elemental analysis (EA). The rate of liquid-liquid phase separation decreases with increasing alcohol molar volume of the coagulation medium. The gas separation performance for metal salt added polycarbonate membranes was better than that of the membrane without additive with pressure-normalized oxygen fluxes of 0.034 × 10 −6 cm 3 (STP)/cm 2 · sec · cmHg and O 2/N 2 selectivity of 6.46. For example: the pressure-normalized oxygen flux and the selectivity of the PC/DMF/CoCl 2 · 6H 2O complex membrane are 4.62 × 10 −6 cm 3 (STP)/cm 2 · s · cmHg and 3.53, respectively with the CH 3OH coagulation medium. The pressure-normalized fluxes for PC/DMF/FeCl 3 · 6H 2O complex membrane were 20 times higher than that of the pure PC membrane with an O 2/N 2 selectivity of 6.83 obtained by the CH 3OH coagulation medium.
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