Details
| Original language | English |
|---|---|
| Pages (from-to) | 7584-7594 |
| Number of pages | 11 |
| Journal | ACS NANO |
| Volume | 17 |
| Issue number | 8 |
| Early online date | 7 Apr 2023 |
| Publication status | Published - 25 Apr 2023 |
Abstract
Covalent organic framework (COF) membranes have emerged as a promising candidate for energy-efficient separations, but the angstrom-precision control of the channel size in the subnanometer region remains a challenge that has so far restricted their potential for gas separation. Herein, we report an ultramicropore-in-nanopore concept of engineering matreshka-like pore-channels inside a COF membrane. In this concept, α-cyclodextrin (α-CD) is in situ encapsulated during the interfacial polymerization which presumably results in a linear assembly (LA) of α-CDs in the 1D nanochannels of COF. The LA-α-CD-in-TpPa-1 membrane shows a high H2 permeance (∼3000 GPU) together with an enhanced selectivity (>30) of H2 over CO2 and CH4 due to the formation of fast and selective H2-transport pathways. The overall performance for H2/CO2 and H2/CH4 separation transcends the Robeson upper bounds and ranks among the most powerful H2-selective membranes. The versatility of this strategy is demonstrated by synthesizing different types of LA-α-CD-in-COF membranes.
Keywords
- covalent organic framework, gas separation, in situ interfacial polymerization, molecular-separation membrane, pore-in-pore engineering
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Engineering(all)
- General Engineering
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: ACS NANO, Vol. 17, No. 8, 25.04.2023, p. 7584-7594.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Pore-in-Pore Engineering in a Covalent Organic Framework Membrane for Gas Separation
AU - Fan, Hongwei
AU - Wang, Haoran
AU - Peng, Manhua
AU - Meng, Hong
AU - Mundstock, Alexander
AU - Knebel, Alexander
AU - Caro, Jürgen
N1 - Funding Information: This work was supported by the German Science Foundation (DFG) within the Priority Program SPP 1928/2, National Natural Science Foundation of China (Program No. 22108010), Fundamental Research Funds for the Central Universities (buctrc202135), and Alexander von Humboldt Foundation.
PY - 2023/4/25
Y1 - 2023/4/25
N2 - Covalent organic framework (COF) membranes have emerged as a promising candidate for energy-efficient separations, but the angstrom-precision control of the channel size in the subnanometer region remains a challenge that has so far restricted their potential for gas separation. Herein, we report an ultramicropore-in-nanopore concept of engineering matreshka-like pore-channels inside a COF membrane. In this concept, α-cyclodextrin (α-CD) is in situ encapsulated during the interfacial polymerization which presumably results in a linear assembly (LA) of α-CDs in the 1D nanochannels of COF. The LA-α-CD-in-TpPa-1 membrane shows a high H2 permeance (∼3000 GPU) together with an enhanced selectivity (>30) of H2 over CO2 and CH4 due to the formation of fast and selective H2-transport pathways. The overall performance for H2/CO2 and H2/CH4 separation transcends the Robeson upper bounds and ranks among the most powerful H2-selective membranes. The versatility of this strategy is demonstrated by synthesizing different types of LA-α-CD-in-COF membranes.
AB - Covalent organic framework (COF) membranes have emerged as a promising candidate for energy-efficient separations, but the angstrom-precision control of the channel size in the subnanometer region remains a challenge that has so far restricted their potential for gas separation. Herein, we report an ultramicropore-in-nanopore concept of engineering matreshka-like pore-channels inside a COF membrane. In this concept, α-cyclodextrin (α-CD) is in situ encapsulated during the interfacial polymerization which presumably results in a linear assembly (LA) of α-CDs in the 1D nanochannels of COF. The LA-α-CD-in-TpPa-1 membrane shows a high H2 permeance (∼3000 GPU) together with an enhanced selectivity (>30) of H2 over CO2 and CH4 due to the formation of fast and selective H2-transport pathways. The overall performance for H2/CO2 and H2/CH4 separation transcends the Robeson upper bounds and ranks among the most powerful H2-selective membranes. The versatility of this strategy is demonstrated by synthesizing different types of LA-α-CD-in-COF membranes.
KW - covalent organic framework
KW - gas separation
KW - in situ interfacial polymerization
KW - molecular-separation membrane
KW - pore-in-pore engineering
UR - http://www.scopus.com/inward/record.url?scp=85152206067&partnerID=8YFLogxK
U2 - 10.1021/acsnano.2c12774
DO - 10.1021/acsnano.2c12774
M3 - Article
C2 - 37026681
AN - SCOPUS:85152206067
VL - 17
SP - 7584
EP - 7594
JO - ACS NANO
JF - ACS NANO
SN - 1936-0851
IS - 8
ER -