Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 27, Pages 24618-24626Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b07815
Keywords
Pebax; nanosheet; mixed matrix membrane; channel; CO2 separation
Funding
- National Natural Science Foundation of China [21868031, 21706166]
- National High Technology Research and Development Program of China [2012AA03A611]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_15R46]
- Yangtze River scholar research project of Shihezi University [CJXZ201601]
- Program for Young Innovative Talents of Shihezi University [CXRC201802]
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Ultrathin microporous nanosheets denoted as Zn-tetra-(4-carboxyphenyl)porphyrin (Zn-TCPP) were synthesized and incorporated into a Pebax MH 1657 (Pebax) polymer to fabricate mixed matrix membranes (MMMs) for efficient CO2 separation. The Zn-TCPP nanosheets with a microporous structure provide high-speed channels for fast CO2 transport and shorten the diffusion pathways, both contributing toward high CO2 permeability. Furthermore, scanning electron microscopy results indicate that the ultrathin Zn-TCPP nanosheets with an ultrahigh aspect ratio (>200) tend to arrange horizontally in the Pebax matrix. The obtained unique cross-sectional structure of the MMMs functions as a selective barrier, allowing repeated discrimination of gases due to the tortuous interlayer of horizontal nanosheets, thus improving the selectivity of the MMMs. In addition, the horizontally arranged microporous nanosheets were found to strongly interact with the membrane matrix and endowed the MMMs with excellent interfacial compatibility, which improved the CO2 permeability and eliminated unselective permeation pathways. Significantly, the optimized CO2 separation performance of the MMMs surpassed the 2008 Robeson's limit.
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