Abstract
Carbon aerogel is a porous carbon material possessing high porosity and high specific surface area. Nitrogen doping reduced the specific surface area and micropores, but it furnished basic sites to improve the <TEX>$CO_2$</TEX> selectivity. In this work, N-doped carbon aerogels were prepared with different ratios of resorcinol/melamine by using the sol-gel method. The morphological properties were characterized by scanning electron microscopy (SEM). Nitrogen content was studied by X-ray photoelectron spectroscopy (XPS) and the specific surface area and micropore volume were analyzed by <TEX>$N_2$</TEX> adsorption-desorption isotherms at 77 K. The <TEX>$CO_2$</TEX> adsorption capacity was investigated by <TEX>$CO_2$</TEX> adsorption-desorption isotherms at 298 K and 1 bar. Melamine containing N-doped CAs showed a high nitrogen content (5.54 wt.%). The prepared N-doped CAs exhibited a high <TEX>$CO_2$</TEX> capture capacity of 118.77 mg/g (at resorcinol/melamine = 1:0.3). Therefore, we confirmed that the <TEX>$CO_2$</TEX> adsorption capacity was strongly affected by the nitrogen moieties.
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