Li Yao, Wang Shiying, Wang Binbin, Wang Yan, Wei Jianping
School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, China.
Nanomaterials (Basel). 2020 Jan 19;10(1):174. doi: 10.3390/nano10010174.
Separation of CO/CH/N is significantly important from the view of environmental protection and energy utilization. In this work, we reported nitrogen (N)-doped porous carbon spheres prepared from sustainable biomass glucose via hydrothermal carbonization, CO activation, and urea treatment. The optimal carbon sample exhibited a high CO and CH capacity, as well as a low N uptake, under ambient conditions. The excellent selectivities toward CO/N, CO/CH, and CH/N binary mixtures were predicted by ideal adsorbed solution theory (IAST) via correlating pure component adsorption isotherms with the Langmuir-Freundlich model. At 25 °C and 1 bar, the adsorption capacities for CO and CH were 3.03 and 1.3 mmol g, respectively, and the IAST predicated selectivities for CO/N (15/85), CO/CH (10/90), and CH/N (30/70) reached 16.48, 7.49, and 3.76, respectively. These results should be attributed to the synergistic effect between suitable microporous structure and desirable N content. This report introduces a simple pathway to obtain N-doped porous carbon spheres to meet the flue gas and energy gas adsorptive separation requirements.
从环境保护和能源利用的角度来看，CO/CH/N的分离具有重要意义。在这项工作中，我们报道了通过水热碳化、CO活化和尿素处理，由可持续生物质葡萄糖制备的氮（N）掺杂多孔碳球。在环境条件下，最佳碳样品表现出高的CO和CH吸附容量以及低的N吸附量。通过理想吸附溶液理论（IAST），将纯组分吸附等温线与Langmuir-Freundlich模型相关联，预测了对CO/N、CO/CH和CH/N二元混合物的优异选择性。在25°C和1 bar下，CO和CH的吸附容量分别为3.03和1.3 mmol g，IAST预测的CO/N（15/85）、CO/CH（10/90）和CH/N（30/70）的选择性分别达到16.48、7.49和3.76。这些结果应归因于合适的微孔结构和理想的N含量之间的协同效应。本报告介绍了一种简单的途径来获得N掺杂多孔碳球，以满足烟气和能源气体吸附分离的要求。
