Efficient CO2 Adsorption on Nitrogen-Doped Porous Carbons Derived from d -Glucose

The synthesis of carbonaceous CO 2 adsorbents doped with nitrogen were carried out via a hydrothermal reaction of biomass d -glucose, followed by urea treatment and K 2 CO 3 activation. These carbons display high uptake of CO 2 at 1 bar and 25 and 0 °C, up to 3.92 and 6.23 mmol g –1, respectively. Additionally, the as-synthesized materials exhibit superior reusability, high CO 2 /N 2 selectivity, fast CO 2 adsorption kinetics, and excellent dynamic capture capacity at the experimental conditions used. The synthetic effect of the nitrogen content and narrow microporosity decide the capture capacity for CO 2 at 1 bar and 25 °C for these N-enriched carbonaceous adsorbents. This study provides a viable method to prepare high-performance CO 2 carbonaceous sorbents without using caustic KOH. In addition, this work gives further insights into the CO 2 adsorption mechanism for nitrogen-doped porous carbon sorbents and, hence, inspires ways to synthesize novel carbonaceous materials for removing CO 2 from combustion exhaust gases.