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

The synthesis of carbonaceous CO₂ adsorbents doped with nitrogen were carried out via a hydrothermal reaction of biomass d-glucose, followed by urea treatment and K₂CO₃ activation. These carbons display high uptake of CO₂ 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 CO₂/N₂ selectivity, fast CO₂ 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 CO₂ at 1 bar and 25 °C for these N-enriched carbonaceous adsorbents. This study provides a viable method to prepare high-performance CO₂ carbonaceous sorbents without using caustic KOH. In addition, this work gives further insights into the CO₂ adsorption mechanism for nitrogen-doped porous carbon sorbents and, hence, inspires ways to synthesize novel carbonaceous materials for removing CO₂ from combustion exhaust gases