超强碱
材料科学
碳纤维
离子液体
化学工程
金属有机骨架
结晶度
胺气处理
复合数
化学
有机化学
催化作用
复合材料
吸附
工程类
作者
Liqi Qiu,Li Peng,Debabrata Moitra,Hongjun Liu,Yuqing Fu,Zhun Dong,Wenda Hu,Ming Lei,De‐en Jiang,Hongfei Lin,Jian Zhi Hu,Kathryn A. McGarry,Ilja Popovs,Meijia Li,Alexander S. Ivanov,Zhenzhen Yang,Sheng Dai
出处
期刊:Small
[Wiley]
日期:2023-06-14
卷期号:19 (41)
被引量:13
标识
DOI:10.1002/smll.202302708
摘要
Direct air capture (DAC) of CO2 has emerged as the most promising "negative carbon emission" technologies. Despite being state-of-the-art, sorbents deploying alkali hydroxides/amine solutions or amine-modified materials still suffer from unsolved high energy consumption and stability issues. In this work, composite sorbents are crafted by hybridizing a robust metal-organic framework (Ni-MOF) with superbase-derived ionic liquid (SIL), possessing well maintained crystallinity and chemical structures. The low-pressure (0.4 mbar) volumetric CO2 capture assessment and a fixed-bed breakthrough examination with 400 ppm CO2 gas flow reveal high-performance DAC of CO2 (CO2 uptake capacity of up to 0.58 mmol g-1 at 298 K) and exceptional cycling stability. Operando spectroscopy analysis reveals the rapid (400 ppm) CO2 capture kinetics and energy-efficient/fast CO2 releasing behaviors. The theoretical calculation and small-angle X-ray scattering demonstrate that the confinement effect of the MOF cavity enhances the interaction strength of reactive sites in SIL with CO2 , indicating great efficacy of the hybridization. The achievements in this study showcase the exceptional capabilities of SIL-derived sorbents in carbon capture from ambient air in terms of rapid carbon capture kinetics, facile CO2 releasing, and good cycling performance.
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