In-situ ion-activated carbon nanospheres with tunable ultramicroporosity for superior CO2 capture
In-situ ion-activated carbon nanospheres with tunable ultramicroporosity for superior CO2 capture
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DOI：
10.1016/j.carbon.2018.10.096
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发表时间：
2019-03
期刊：
影响因子：
10.9
通讯作者：
Zhen Zhang;Dan Luo;Gregory Lui;Gaoran Li;G. Jiang;Z. Cano;Ya-Ping Deng;Xiaojuan Du;Song Yin-Son
中科院分区：
文献类型：
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作者：
Zhen Zhang;Dan Luo;Gregory Lui;Gaoran Li;G. Jiang;Z. Cano;Ya-Ping Deng;Xiaojuan Du;Song Yin-Son
超微孔炭材料在CO2捕集和分离中发挥着重要作用，但如何设计出孔径、孔数和孔比可控的超微孔炭材料仍是一个难题。本文基于原位离子活化方法，提出了一种设计具有丰富、均匀、可调的超微孔结构的碳纳米球的新策略。氧化官能化的可调离子交换容量被发现能够基本上控制离子活化和精确地调节所得产品中的超微孔。优化设计的碳纳米球的超临界CO2含量达到95.5%，表现出优异的CO2捕获性能，在典型烟气条件下具有极高的容量，为1.58 mmol g− 1，在25 °C和环境压力下为4.30 mmol g− 1。此外，还通过分子动力学模拟对超临界CO2吸附机理进行了研究，以指导孔径优化。该工作为设计具有丰富且可调的超微孔结构的碳材料提供了一种新颖且简便的指导方针，以实现上级CO2捕获性能，这也在水净化，催化和储能等广泛应用中提供了巨大的潜力。
Ultramicroporous carbon materials play a critical role in CO2capture and separation, however facile approaches to design ultramicroporous carbon with controllable amount, ratio and size of pores are still challenging. Herein, a novel strategy to design carbon nanospheres with abundant, uniform, and tunable ultramicroporosity was developed based on an in-situ ionic activation methodology. The adjustable ion-exchange capacity derived from oxidative functionalization was found capable of substantially governing the ionic activation and precisely regulating the ultramicroporosity in the resultant product. An ultrahigh ultramicropore content of 95.5% was achieved for the optimally-designed carbon nanospheres, which demonstrated excellent CO2capture performances with extremely high capacities of 1.58 mmol g−1at typical flue gas conditions and 4.30 mmol g−1at 25 °C and ambient pressure. Beyond that, the CO2adsorption mechanism in ultramicropore was also investigated through molecular dynamics simulation to guide the pore size optimization. This work provides a novel and facile guideline to engineer carbon materials with abundant and tunable ultramicroporosity towards superior CO2capture performance, which also delivers great potential in extensive applications such as water purification, catalysis, and energy storage.