In this study, N-enriched porous carbons were prepared by a facile synthesis method at low temperatures ranging from 400 to 500 °C. Sodium amide was used as both activator and nitridation reagent, and lotus stalk was used as the carbon precursor. The as-synthesized samples demonstrate the maximum CO₂ uptake of 3.88 and 5.62 mmol/g at 25 and 0 °C, respectively, at atmospheric pressure. Moreover, these lotus stalk-derived adsorbents exhibit a rapid CO₂ adsorption rate, high CO₂/N₂ selectivity, moderate CO₂ isosteric heat of adsorption, stable cyclic ability, and excellent dynamic CO₂ capture capacity. Systematic research shows that, besides the volume of narrow micropore and nitrogen content, the pore size distribution is also a non-negligible factor in determining CO₂ adsorption capacity under ambient condition for these adsorbents. The good CO₂ adsorption performance together with single-step and low-temperature preparation indicates that these sorbents are very promising for CO₂ capture from flue gas.

中文翻译：

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酰胺活化法低温一步合成高掺杂CO ₂的N掺杂多孔碳

在这项研究中，通过简便的合成方法在400至500°C的低温下制备了富含N的多孔碳。酰胺钠既用作活化剂，又用作氮化剂，莲lotus用作碳前体。合成后的样品在大气压下分别于25和0°C表现出最大的CO ₂吸收量，分别为3.88和5.62 mmol / g。而且，这些源自莲lotus的吸附剂表现出快速的CO ₂吸附速率，高的CO ₂ / N ₂选择性，中等的CO ₂等规吸附热，稳定的循环能力和出色的动态CO _2。捕获能力。系统研究表明，除了狭窄的微孔体积和氮含量外，孔径分布也是确定环境条件下这些吸附剂对CO ₂吸附能力的不可忽略的因素。良好的CO ₂吸附性能以及一步法和低温制备表明这些吸附剂对于从烟道气中捕集CO ₂很有前景。