Constructing Hierarchically Porous N-Doped Carbons Derived from Poly(ionic liquids) with the Multifunctional Fe-Based Template for CO(2) Adsorption.
Constructing Hierarchically Porous N-Doped Carbons Derived from Poly(ionic liquids) with the Multifunctional Fe-Based Template for CO(2) Adsorption.
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用多功能铁基模板构建聚离子液体衍生的多级多孔 N 掺杂碳用于 CO2 吸附
DOI：
10.1021/acsomega.1c00419
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发表时间：
2021-03-16
期刊：
影响因子：
4.1
通讯作者：
Guan G
中科院分区：
文献类型：
--
作者：
Guo Q;Chen C;Xing F;Shi W;Meng J;Wan H;Guan G
以铁氰化钾/聚离子液体（PIL）复合物为原料，采用直接碳化法制备了具有丰富孔结构的氮掺杂分级多孔炭。其中，双乙烯基咪唑类PIL是理想的碳源，铁氰化钾作为多功能铁基模板剂，不仅可以作为成孔剂，将金属组分（Fe和Fe 3C）、钾离子（碳化过程中腐蚀碳骨架）和热解过程中产生的气体引入多孔碳中，还可以将N原子引入多孔碳中，有利于CO2的捕集。与直接从PIL中分离得到的NDC-800（NDC，nitrogen-doped carbon）相比，多级多孔炭NDPC-1-800（NDPC，nitrogen-doped porous carbon）具有更高的比表面积，表现出优异的CO2吸附能力和选择性。此外，其多级孔结构在CO2捕集过程中发挥了重要作用，主要表现在：微孔和中孔的协同作用可以促进CO2分子的运输和储存。合适的微孔尺寸分布有利于提高NDPC-1-800的CO2/N2选择性。本研究的目的是将多功能的铁基模板剂铁氰化钾与PIL结合起来，设计具有良好气体吸附分离性能的氮掺杂多孔炭材料。
Nitrogen-doped hierarchical porous carbons with a rich pore structure were prepared via direct carbonization of the poly(ionic liquid) (PIL)/potassium ferricyanide compound. Thereinto, the bisvinylimidazolium-based PIL was a desirable carbon source, and potassium ferricyanide as a multifunctional Fe-based template, could not only serve as the pore-forming agent, including metallic components (Fe and Fe3C), potassium ions (etching carbon framework during carbonization), and gas generated during the pyrolysis process, but also introduce the N atoms to porous carbons, which were in favor of CO2 capture. Moreover, the hierarchically porous carbon NDPC-1-800 (NDPC, nitrogen-doped porous carbon) had taken advantage of the highest specific surface area, exhibiting an excellent CO2 adsorption capacity and selectivity compared with NDC-800 (NDC, nitrogen-doped carbon) directly carbonized from the pure PIL. Furthermore, its hierarchical porous architectures played an important part in the process of CO2 capture, which was described briefly as follows: the synergistic effect of mesopores and micropores could accelerate the CO2 molecules’ transportation and storage. Meanwhile, the appropriate microporous size distribution of NDPC-1-800 was conducive to enhancing CO2/N2 selectivity. This study was intended to open up a new pathway for designing N-doped porous carbons combining both PILs and the multifunctional Fe-based template potassium ferricyanide with wonderful gas adsorption and separation performance.
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