Abstract
AbstractCO2 gas solubility and permeability in conventional imidazolium ionic liquids (ILs) confined in hydrophobic and hydrophilic PVDF membranes were investigated and compared with that in the bulk IL phase, revealing the effect of the support and the possible interactions of IL with the support material. Experimental results showed CO2 solubility in supported ionic liquid membranes (SILMs) increased approximately by a factor of 1.2 to 3.9 compared with that in the bulk IL. Meanwhile, the CO2 permeability in different SILMs was in the range of (0.5∼10.5) × 10−12 m2·s−1·kPa−1, which was almost a hundred times higher than that of CO2 in the pure IL. Compared with hydrophobic SILMs, hydrophilic SILMs with same pore size and porosity could load more ILs, however, providing lower specific surface for adsorbent. Correspondingly, CO2 solubility in all hydrophobic SILMs was higher than that in hydrophilic SILMs, which is consistent with the molecular property expression of the Henry constant derived from statistic mechanics, manifesting CO2 solubility affected by the interface effect of membrane with ILs. Besides the effect of specific surface area of IL adsorbent, the reorganization of cation and anion confined in sub‐micrometer pores maybe causes more IL free volume and improves CO2 permeance. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd.
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