N-doped porous carbon derived from macadamia nut shell for CO2 adsorption

• Published in: Fuel processing technology Vol. 249; p. 107854
• Main Authors: Bai, Jiali, Huang, Jiamei, Yu, Qiyun, Demir, Muslum, Kilic, Murat, Altay, Bilge Nazli, Hu, Xin, Wang, Linlin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2023
• Subjects: adsorbents; adsorption; Biomass waste; carbon; carbon dioxide; CO2 adsorption; fuels; green chemistry; heat; hulls; Macadamia; macadamia nuts; Macadamia nutshell; melamine; N-doped; nitrogen; Porous carbons; surface area; technology; N-doped; Porous carbons; Macadamia nutshell; Biomass waste; CO2 adsorption
• ISSN: 0378-3820
• DOI: 10.1016/j.fuproc.2023.107854

Selective adsorption and converting CO2 upon efficient solid-based adsorbents is critical for net-zero accomplishment. Herein, we develop an advisable strategy to prepare nitrogen-enriched porous carbons using the macadamia nutshell (MNS) as a carbon precursor, KOH as the activator and melamine as the nitrogen agent, respectively. The as-prepared porous carbons exhibit an enhanced specific surface area of 1731 m2/g and high microporosity with abundant nitrogen functional groups and structural defects. The CO2 uptake of 6.61 and 4.35 mmol g−1 were achieved at 0 and 25 °C, respectively, under 1 bar. More importantly, these biomass-based nitrogen-doped carbons possess various CO2 adsorption merits such as quick adsorption kinetics, high CO2/N2 selectivity, medium heat of adsorption, outstanding uninterrupted recyclability and good dynamic CO2 capture capacity. The present study provides an advanced protocol to design nitrogen-doped porous Carbon via a facile route toward the capture of CO2, which offers excellent progress in sustainable chemistry and engineering. [Display omitted] •N-doped porous carbons were synthesized from biomass waste.•Macadamia nut shell as the precursor, melamine as the N source, KOH as the activator.•The obtained carbon exhibits high CO2 adsorption capacity, 6.61 mmol g−1 at 0 °C and 1 bar.•The adsorbents also possess many good CO2 adsorption properties.•Synergetic effect of narrow microporosity and N functionalities determines CO2 uptake.