Molten Salt Template Synthesis of Hierarchical Porous Nitrogen-Containing Activated Carbon Derived from Chitosan for CO2 Capture
Molten Salt Template Synthesis of Hierarchical Porous Nitrogen-Containing Activated Carbon Derived from Chitosan for CO2 Capture
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DOI：
10.1021/acsomega.0c03497
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发表时间：
2020-09
期刊：
影响因子：
4.1
通讯作者：
Peiyu Wang;Guoheng Zhang;Wanjun Chen;Qiong Chen;H. Jiao;Liwei Liu;Xiangli Wang;Xiaoyan Deng
中科院分区：
文献类型：
--
作者：
Peiyu Wang;Guoheng Zhang;Wanjun Chen;Qiong Chen;H. Jiao;Liwei Liu;Xiangli Wang;Xiaoyan Deng
本文以廉价的壳聚糖为原料，以LiCl-ZnCl 2熔盐为模板，通过简单的一步碳化法制备了多级多孔含氮活性炭（N-AC）。在较低的熔盐/壳聚糖质量比（3/1）和适中的煅烧温度（1000 °C）下，制得的N-AC具有最高的比表面积（2025 m2 g-1）和较高的氮含量（5.1wt%）。重要的是，使用这些N-AC作为CO2固态吸附剂，在0 °C/25 °C下在1巴压力下的最大CO2捕获容量可以分别高达7.9/5.6 mmol g-1。这些N-AC的CO2捕获能力是最高的相比，已报道的生物质衍生的碳材料，这些值也与大多数多孔碳材料相当。此外，所制备的N-AC还显示出良好的CO2/N2分离选择性和优异的可回收性。因此，N-AC独特的分层多孔结构提供了吸附剂性能的正确组合，并可以设计高性能的CO2固体吸附剂。
Here, hierarchical porous nitrogen-containing activated carbons (N-ACs) were prepared with LiCl-ZnCl2 molten salt as a template derived from cheap chitosan via simple one-step carbonization. The obtained N-ACs with the highest specific surface area of 2025 m2 g–1 and a high nitrogen content of 5.1 wt % were obtained using low molten salt/chitosan mass ratio (3/1) and moderate calcination temperature (1000 °C). Importantly, using these N-ACs as CO2 solid-state adsorbents, the maximum CO2 capture capacities could be up to 7.9/5.6 mmol g–1 at 0 °C/25 °C under 1 bar pressure, respectively. These CO2 capture capacities of N-ACs were the highest compared to reported biomass-derived carbon materials, and these values were also comparable to most of porous carbon materials. Moreover, as-made N-ACs also showed good selectivity for CO2/N2 separation and excellent recyclability. The unique hierarchical porous structure of N-ACs thus provided the right combination of adsorbent properties and could enable the design of high-performance CO2 solid adsorbents.