Ultrathin polyamide membrane tailored by mono-(6-ethanediamine-6-deoxy)-β-cyclodextrin for CO2 separation
JOURNAL OF MEMBRANE SCIENCE(2023)
摘要
The fabrication of membranes with high CO2 separation performances is an urgent need for clean energy supply and environmental remediation. In this work, the mono-(6-ethanediamine-6-deoxy)-β-cyclodextrin (MEDβCD) fillers are intentionally constructed to tailor the polyamide membranes (MEDβCD/PA) by interfacial polymerization (IP) for CO2 separation. The unique hollow cone structure of MEDβCD alleviates the vigorous IP process, generating a thinner separation layer with larger chain d-spacing. Additionally, the introduction of CO2-philic groups from MEDβCD can facilitate CO2 molecule transport. The fabricated MEDβCD/PA membrane exhibits remarkable increases in CO2 permeance, CO2/H2, CO2/N2, and CO2/CH4 selectivities, which are 39, 17, 11, and 25 times higher than those of the pure PA membrane, respectively. This work provides a straightforward route to fabricate composite membranes tailored by macrocyclic molecules with cone structures and other cavitands for gas separation.
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关键词
Gas separation,Polyamide membranes,MEDβCD,Cone structures,CO2-Philic groups
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