Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 239, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.116539
Keywords
Pebax; Nanocage; Ionic liquid; Mixed matrix membrane; CO2 separation
Categories
Funding
- National Natural Science Foundation for Young Scientists of China [21706166]
- Program for Young and Middle-aged Scientific and Technological Innovation Leaders in Bingtuan [2019CB024]
- Program for Young Innovative Talents of Shihezi University [CXRC201802]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R46]
- Major Science and Technology Project of Xinjiang Bingtuan [2017AA007/01]
- Yangtze River scholar research project of Shihezi University [CJXZ201601]
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An ionic liquid-decorated layered double hydroxide nanocage ([Hmim][NTf2]@LDHN) was designed and incorporated into Pebax matrix to fabricate high-performance MMMs for CO2 separation. The [Hmim)[NTf2] on the external surface, interlamellar spacing, and internal hollow core of LDHN plays cooperative roles with LDHN for improving CO2 permselectivity. First, the (Hmim)[NTf2] on the external surface of LDHN absorbs more CO2 molecules than CH4, improving CO2/CH4 selectivity. Then, the captured CO2 permeates into LDHN shells and are dissolved by [Hmim] [NTf2] in the interlamellar spacing of LDNH. The dissolved CO2 combines quickly with CO32- carriers existed in LDHN itself, accelerating CO2 transport. Third, the [Hmim] [NTf2] encapsulated in the internal hollow core of the LDHN has an ultrahigh CO2 capacity, which increases both CO2 permeability and selectivity. The cooperation of [Hmim](NTf2] and LDHN significantly enhances CO2 separation performance. In particular, under humidified conditions the Pebax/[Hmim] [NTf2]@LDHN-6 MMM presents optimal separation performance with a CO2 permeability of 644 +/- 25 Barrer and a CO2/CH4 separation factor of 34 +/- 0.53, which transcends the upper bound relationship developed by Robeson (2008). The nanofillers combining ILs with nanocages exhibit a promising prospect to fabricate high-performance MMMs for gas separations.
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