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8. Directional porous polyimide/polyethylene glycol composite aerogel with enhanced CO2 uptake performance.

Author

Nie, Yihao, Yi, Xibin, Zhao, Xinfu, Yu, Shimo, Zhang, Jing, Liu, Xiaochan, Liu, Sijia, Yuan, Zhipeng, and Zhang, Minna

Subjects
*POLYETHYLENE glycol, *AEROGELS, *POROSITY, *MASS transfer, *LIQUID nitrogen
Abstract

The cost of CO2 separation and energy consumption can be decreased through the use of CO2 adsorption. Due to the electron-rich heteroatoms in its network, polyimide (PI) has a remarkable affinity for CO2. Polyethylene glycol (PEG) can increase the layer spacing of polymers, so as to change the mass transfer of CO2 in it. Furthermore, the ether bond (-O-) in PEG has good affinity for CO2. In this study, PEG-1000 was introduced into PI aerogel by mild sol-gel method at low temperature, and freeze-drying was used to produce PI/PEG composite aerogels with directional pore structure. The effect of PEG-1000 content and directional pore structure of the PI/PEG composite aerogels on CO2 adsorption performance were further studied. The L-PI/PEG-4 composite aerogel, which contains 4 g PEG and is directionally frozen in liquid nitrogen, has a CO2 adsorption capacity of 16.76 cm3/g at 25°C and 1 bar. L-PI/PEG-4 aerogel also exhibits high CO2/N2 selectivity and adsorption cycle stability. [ABSTRACT FROM AUTHOR]

Published
2023
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9. Supplemental Material - Directional porous polyimide/polyethylene glycol composite aerogel with enhanced CO2 uptake performances

Author

Nie, Yihao, Yi, Xibin, Zhao, Xinfu, Yu, Shimo, Zhang, Jing, Liu, Xiaochan, Liu, Sijia, Yuan, Zhipeng, and Zhang, Minna

Subjects
FOS: Materials engineering, 91299 Materials Engineering not elsewhere classified
Abstract

Supplemental Material for Directional porous polyimide/polyethylene glycol composite aerogel with enhanced CO2 uptake performance by Yihao Nie, Xibin Yi, Xinfu Zhao, Shimo Yu, Jing Zhang, Xiaochan Liu, Sijia Liu, Zhipeng Yuan and Minna Zhang in High Performance Polymers

Published
2022
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10. Design of hierarchically porous carbon frameworks for enhanced CO2capture performance

Author

Zhao, Xinfu, Nie, Yihao, Yi, Xibin, Yu, Shimo, Zhang, Jing, Liu, Xiaochan, Liu, Sijia, and Yuan, Zhipeng

Abstract

To reduce the environmental impact of CO2, CO2capture has become an area of research interest. Hierarchically porous materials have been certified as efficiency CO2capture adsorbents. This work is aimed to construct hierarchically porous carbon frameworks (CPI-TPUs) with enhanced CO2capture performance. CPI-TPUs are derived from polyimide (PI)/thermoplastic polyurethane (TPU) composite aerogels (PI-TPUs) with mesopores and macropores. Accordingly, the obtained CPI-TPU2 exhibits an improved CO2uptake capacity (2.21 mmol/g, 298 K) compared to the pure CPI and PI-TPUs due to the synergistic effect of hierarchically pores, higher specific area and electron-rich heteroatoms. Specially, CPI-TPUs with pore volume ratio of mesopores/macropores to total pores in a range of 6–21 show high CO2uptake performance. These CPI-TPUs with high CO2adsorption capacities and suitable isosteric adsorption heats (Qst) are promising CO2adsorbents.

Published
2023
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