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Membranes 2014, 4 295 CO2-soluble IL, while CO2 solubility remained constant, compared with the two-component ETS-10/CS MMM. This accounts for the CO2 affinity of the novel membrane materials synthesized in this work. The permeation data obtained experimentally in this work are plotted against the Robeson’s upper bound in Figure 5. There is a monotonous increase in permeability and selectivity, as the pure CS matrix is hybridized by the introduction of the small amounts of IL, ETS-10, and both. The highest permeability of the ETS-10/IL/CS MMMs is due to the IL/CS continuous phase and interaction of the IL both with particles and polymer [11]. The loading amount is kept constant as low as 5 wt % with respect to CS concentration, and there is no decrease in selectivity observed, the MMM performance almost reaching that of other membrane morphologies, such as IL supported membranes (SILM) and purely inorganic ETS-10 tubular membranes. Table 4. Solubility (S) of measured gases in MMMs. Membrane material S(N2), Solubility Selectivity cm3 (STP)/cm3 cmHg (CO2/N2) -a -a -a -a 0.0050 15.34 0.0255 19.84 0.0029 27.58 0.0019 38.48 a Lower than detection limits. S(CO2), cm3 (STP)/cm3 cmHg IL 0.0114 ETS-10 0.1019 CS 0.0767 IL/CS 0.5065 ETS-10/CS ETS-10/IL/CS 0.0798 0.0724 Figure 5. Comparison of CO2 permeability and CO2/N2 selectivity for the CS-based MMMs with Robeson’s upper bound [8A]. Void symbols represent the membranes where CS is the continuous phase, filled symbols those where the continuous phase is constituted by IL/CS. Dense CS, IL, and ETS-10 are literature pair values for dense CS membranes [38], supported [emim][Ac] membranes on a porous PVDF disk [22] and pure ETS-10 inorganic membranes on porous alumina supports [21], respectively. 100 10 1 10 100 1000 P(CO2 [Barrer]) Hence, the addition of IL in just a small amount in the membrane not only increased permeability, but also seemed to act as intermediate medium imparting improved adhesion between the CS continuous polymer and the ETS-10 dispersed nanoparticles as well as enhanced CO2 affinity. ETS-10/CS IL/CS CS ETS-10/IL/CS SILM ETS-10 Robeson's upperbound α(CO2/N2) [-]PDF Image | Synthesis and Characterisation of ETS-10 Acetate-based Ionic
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