Amine-impregnated elastic carbon nanofiber aerogel templated by bacterial cellulose for CO2 adsorption and separation

Carbon aerogel has become a promising electrode material for CO 2 capture and capacitor due to its large specific surface area, well-developed pore structure, adjustable porosity and ultra-high specific power. However, most of the carbon-based materials suffer from poor mechanical properties, low recycling efficiency, and low adsorption capacity, making it difficult to be put into industrial applications on a large scale. Bacterial cellulose (BC) has an ultra-fine reticular structure, a modulus of elasticity that is several to more than ten times that of typical plant fibers, and high tensile strength. In this paper, BC was treated by unidirectional freeze-drying method, and the aerogels with ordered honeycomb pore structure were constructed by unidirectional growth of ice crystals, and the pyrolytic chemical properties of BC were adjusted by using (NH 4 ) 2 SO 4 , which effectively prevented the shrinkage and deformation of materials during carbonization, and successfully prepared elastic nanocarbon fiber aerogels. At the same time, the introduction of (NH 4 ) 2 SO 4 made the material realize N doping in the carbonization process, providing more adsorption sites, which was conducive to the adsorption of CO 2 . Finally, the carbon fiber nanoaerogel was modified by TEPA to further improve its adsorption selectivity for CO 2 . The prepared elastic carbon nanofiber aerogel (CBCNT) has high CO 2 adsorption performance and high selectivity, and its CO 2 capture capacity is up to 4.88 mmol/g. At the same time, its capacitance also reached 246F/g.