Design of biomass-based N, S co-doped porous carbon via a straightforward post-treatment strategy for enhanced CO2 capture performance,Science of the Total Environment

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Design of biomass-based N, S co-doped porous carbon via a straightforward post-treatment strategy for enhanced CO2 capture performance
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-04-29 , DOI: 10.1016/j.scitotenv.2023.163750
Meng Cao ₁ , Yu Shu ₂ , Qiuhong Bai ₁ , Cong Li ₁ , Bang Chen ₁ , Yehua Shen ₃ , Hiroshi Uyama ₄

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Biomass-based adsorbents are considered to have great potential for CO capture due to their low cost, high efficiency and exceptional sustainability. The aim of this work is to design a simple method for preparing biomass-based adsorbents with abundant active sites and large numbers of narrow micropores, so as to enhance CO capture performance. Herein, N, S co-doped porous carbon (NSPC) was created utilizing walnut shell-based microporous carbon (WSMC) as the main framework and thiourea as N/S dopant through physical grinding and post-treatment process at a moderate temperature without any other reagents and steps. By altering the post-treatment parameters, a series of porous carbons with varying physico-chemical properties were prepared to discuss the roles of microporosity and N/S functional groups in CO adsorption. NSPC with narrow micropore volume of 0.74 cm g, N content of 4.89 % and S contents of 0.71 % demonstrated the highest CO adsorption capacity of 7.26 (0 °C) and 5.51 mmol g (25 °C) at 1 bar. Meanwhile, a good selectivity of binary gas mixture CO/N (15/85) of 29.72 and outstanding recyclability after ten cycles of almost 100 % adsorption capacity retention were achieved. The proposed post-treatment method was beneficial in maintaining the narrow micropores and forming N/S active sites, which together improve the CO adsorption performance of NSPC. The novel NSPC displays amazing CO adsorption characteristics, and the practical, affordable synthetic approach exhibits significant potential to produce highly effective CO adsorbents on a broad scale.

中文翻译：

通过简单的后处理策略设计基于生物质的 N、S 共掺杂多孔碳，以增强 CO2 捕获性能

生物质吸附剂因其低成本、高效率和卓越的可持续性而被认为具有巨大的二氧化碳捕集潜力。本工作的目的是设计一种简单的方法来制备具有丰富活性位点和大量狭窄微孔的生物质基吸附剂，以提高 CO 捕获性能。本文以核桃壳基微孔碳（WSMC）为主要骨架，以硫脲为N/S掺杂剂，通过物理研磨和中等温度后处理工艺制备了N、S共掺杂多孔碳（NSPC）。其他试剂和步骤。通过改变后处理参数，制备了一系列具有不同物理化学性质的多孔碳，以讨论微孔率和N/S官能团在CO吸附中的作用。 NSPC 的窄微孔体积为 0.74 cm g，N 含量为 4.89 %，S 含量为 0.71 %，在 1 bar 下表现出最高的 CO 吸附容量，分别为 7.26 (0 °C) 和 5.51 mmol g (25 °C)。同时，二元气体混合物CO/N (15/85)具有29.72的良好选择性，并且在十个循环后几乎100%的吸附容量保持率具有出色的可回收性。所提出的后处理方法有利于保持狭窄的微孔并形成N/S活性位点，从而共同提高NSPC的CO吸附性能。新颖的 NSPC 显示出惊人的 CO 吸附特性，并且实用且经济的合成方法具有大规模生产高效 CO 吸附剂的巨大潜力。

更新日期：2023-04-29

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