51. Low-Resistance Transport Pathways in POSS/CPBI Mixed Matrix Membranes for Efficient CO2 Separation.
- Author
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Li, Kang, Lv, Xia, Wang, Jiangnan, Li, Long, Chen, Fei, Wang, Jun, Wang, Zhihao, and Li, Xueqin
- Abstract
An amino-functionalized polyhedral oligomeric silsesquioxane (NH
2 -POSS) was grafted onto molecular chains of a chlorinated alkane-activated polybenzimidazole (CPBI) matrix to fabricate mixed matrix membranes (MMMs) for highly efficient CO2 /CH4 separation. The nanocages NH2 -POSS contributed significantly to the improvement of the CO2 separation performance. The following explanations were given as the primary causes: first, the nanocages NH2 -POSS constructed low-resistance transport pathways for accelerating CO2 transport in MMMs. Second, the amino groups of NH2 -POSS provided carriers for CO2 , benefiting the improvement of CO2 selectivity. Moreover, the introduced nanocages NH2 -POSS reduced the face to face packing and strong hydrogen bonding between CPBI molecule chains to enhance CO2 permeability. As a result, the CO2 /CH4 separation performance of CPBI/NH2 -POSS MMMs was significantly improved. In particular, compared with the pure CPBI membrane, the CO2 permeability and CO2 /CH4 separation factor of CPBI/NH2 -POSS-6 MMM were increased by 196.9 and 248.2%, respectively. This work suggested that an efficient strategy for CO2 /CH4 separation involved the construction of low-resistance transport pathways by nanocage fillers. [ABSTRACT FROM AUTHOR]- Published
- 2023
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