Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua 321004, China.
College of Engineering, Zhejiang Normal University, Jinhua 321004, China.
J Environ Sci (China). 2021 May;103:268-278. doi: 10.1016/j.jes.2020.11.008. Epub 2020 Dec 3.
In this work, the waste biomass lotus leaf was converted into N-doped porous carbonaceous CO adsorbents. The synthesis process includes carbonization of lotus leaf, melamine post-treatment and KOH activation. For the resultant sorbents, high nitrogen content can be contained due to the melamine modification and advanced porous structure were formed by KOH etching. These samples were carefully characterized by different techniques and their CO adsorption properties were investigated in detail. These sorbents hold good CO adsorption abilities, up to 3.87 and 5.89 mmol/g at 25 and 0°C under 1 bar, respectively. By thorough investigation, the combined interplay of N content and narrow microporous volume was found to be responsible for the CO uptake for this series of sorbents. Together with the high CO adsorption abilities, these carbons also display excellent reversibility, high CO/N selectivity, applicable heat of adsorption, fast CO adsorption kinetics and good dynamic CO adsorption capacity. This study reveals a universal method of obtaining N-doped porous carbonaceous sorbents from leaves. The low cost of raw materials accompanied by easy synthesis procedure disclose the enormous potential of leaves-based carbons in CO capture as well as many other applications.
在这项工作中，废生物质荷叶被转化为 N 掺杂多孔碳质 CO 吸附剂。合成过程包括荷叶碳化、三聚氰胺后处理和 KOH 活化。对于所得的吸附剂，由于三聚氰胺改性可以包含高氮含量，并且通过 KOH 刻蚀形成了先进的多孔结构。这些样品通过不同的技术进行了仔细的表征，并详细研究了它们的 CO 吸附性能。这些吸附剂具有良好的 CO 吸附能力，在 25 和 0°C 下，在 1 巴的压力下，分别达到 3.87 和 5.89 mmol/g。通过深入研究，发现 N 含量和窄微孔体积的综合相互作用是导致一系列吸附剂对 CO 吸收的原因。这些碳材料除了具有高的 CO 吸附能力外，还表现出优异的可逆性、高的 CO/N 选择性、适用的吸附热、快速的 CO 吸附动力学和良好的动态 CO 吸附容量。本研究揭示了一种从叶片中获得 N 掺杂多孔碳质吸附剂的通用方法。原材料成本低，合成工艺简单，揭示了基于叶片的碳在 CO 捕集以及许多其他应用中的巨大潜力。
