Rapid microwave synthesis of nitrogen-doped ultramicroporous coal-based carbon with enhanced CO2 adsorption performance

作者：Yulin Feng, Xian-Yu Meng, Jingyu Li, Naiyuan Xue, Wanjing Li, Miaoting Sun, Jiaxiang Chen, Xingxing Wang, Ruida Zhou, W.-Q. Zhuang, Jihui Gao, Guangbo Zhao, Wei Zhou · 发表于：Sustainable Carbon Materials · 年份：2026 · DOI：10.48130/scm-0026-0001 · 被引用次数：1 · 研究领域：Carbon Dioxide Capture Technologies、Adsorption and biosorption for pollutant removal、Industrial Gas Emission Control

Ningdong coal was used as the raw material to develop a synergistic 'pre-oxidation + microwave activation' strategy for the preparation of nitrogen/oxygen co-doped ultramicroporous coal-based activated carbons (ACs), for efficient CO 2 adsorption. By tuning the microwave power and pretreatment conditions, the microcrystalline structure, pore size distribution, and surface functional groups of the ACs were precisely controlled. The results show that pre-oxidation significantly enhances nitrogen retention and doping efficiency, forming CO 2 -philic active sites dominated by pyridinic and pyrrolic nitrogen, with a maximum nitrogen content of 10.06 at.%. Meanwhile, a large number of ultramicropores (0.6–0.7 nm) were constructed, which effectively improved the CO 2 adsorption capacity and selectivity. The optimized sample achieved CO 2 uptake of 4.72 mmol·g −1 at 0 °C and 1 bar, and maintained 3.33 mmol·g −1 at 25 °C, with CO 2 /N 2 selectivity greater than 50. This work provides theoretical guidance and a practical pathway for the structure–function co-regulation and carbon capture applications of low-cost coal-derived ACs.