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10 Electrospun Nanofibrous Sorbents and Membranes for Carbon Dioxide Capture 257 Fig. 10.3 (a) SEM image of ACF-PANS (scale bar equals to 20 m) and (b) breakthrough profiles of SO2 over different materials (ACF, ACF-CNF, ACFPAN, ACF-PANS, and ACF-PANC) (Reprinted from Katepalli et al. [39]. Copyright 2011, with permission from Elsevier) and ACF-PANC) were tested for their adsorption properties toward common atmospheric pollutants (e.g., SO2, CO2, NO, and toluene), and the performance was compared to ACF and another hierarchical carbon fabric fabricated by growing carbon nanofibers on metal-impregnated ACF (ACF-CNF) by chemical vapor deposition. Interestingly, the performance of the ACF-PANS was found to be superior to that of ACF, ACF-PANC, and ACF-CNF fabrics (Fig. 10.3b). The superior adsorptive performance of ACF-PANS may be attributed to the large number of nitrogen-based surface functional groups, which favored the adsorption and catalytic oxidation of SO2 or CO2. 10.4.3 Ionic Liquid-Based Nanofibrous Membranes for CO2 Separation To date, many kinds of CO2 separation membranes have been reported, including polymeric membranes, composite membranes, and facilitated transport membranes. Further improvements in membrane performance depend on effective CO2 separa- tion materials, and one candidate is ILs. It has been reported that ILs have good CO2 selectivity, suggesting that they may be a possibility for the development of new CO2 separation materials. Since ILs are liquid at room temperature, it is necessary to affix ILs to appropriate support materials. Supported IL membranes have been prepared by impregnation of commercial porous polymer films with 1- n-hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([hmim][Tf2N]) and have obtained good CO2/He separation properties [40]. Recently, electrospun Nafion/polyethylene oxide (PEO)-supported IL membranes were fabricated for CO2 separation [41]. In this composite membrane, the electrospun Nafion/PEO material acted as a gutter layer for ILs and PEO was added to form clean nanofibrousPDF Image | Electrospun Nanofibrous Sorbents
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