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10 Electrospun Nanofibrous Sorbents and Membranes for Carbon Dioxide Capture 255 Fig. 10.2 (a) SEM image of chemical-treated GNFs. (b) CO2 isotherms of the pristine and chemical-treated GNFs (Reprinted from Meng and Park [16]. Copyright 2010, with permission from Elsevier) 10.4 Electrospun Nanofibers for CO2 Capture 10.4.1 Electrospun Nanofiber-Supported MOF for CO2 Capture Great attention has been paid to preparing MOF particles with novel structures and desired properties. Recently, new focus has been placed on the fabrication of supported MOF thin films and membranes [31], particularly given their utility in engineering-related applications such as membrane-based molecular separators, reactors, and chemical sensors [15]. The use of compact substrates and surface mod- ification with organic functional groups are the most commonly used approaches for fabricating MOF thin films [32]. More recently, several attempts have been made to generate more useful MOF membranes by growing continuous MOF crystals on porous organic polymer substrates [33, 34]. Nevertheless, well-intergrown, free-standing, and high MOF-loading films were difficult to achieve. Therefore, a new class of porous substrates with easily tunable structural parameters (e.g., composition, porosity, thickness, and size), in particular, surface properties, or with seed crystals tightly embedded on the surface, is highly desirable. Nanofibrous membranes produced by electrospinning are ideal porous substrates for developing chemical systems due to their high specific surface area, large porosity, and enormous structural and chemical tenability [15]. Recently, Ostermann et al. [35] reported the fabrication of MOF-containing polymer nanofibers via electrospinning. However, since the MOF particles were embedded in the electro- spun polymer nanofibers, an additional diffusion barrier formed around the MOF particles and thus resulted in reduced gas uptake and access into MOFs. In order to overcome this drawback, Wu et al. [15] reported a new strategy to produce free- standing MOF membranes using electrospun nanofibrous membranes as skeletons. A two-step procedure was developed, namely, the preparation of MOF nanocrystal b 30 15 0 60 GNF G−700 G−800 45 G−900 G−1000 0.0 0.2 0.4 0.6 0.8 1.0 P/Pg CO2 adsorbed (mg/g, 25 oC)PDF Image | Electrospun Nanofibrous Sorbents
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