2021
DOI: 10.1039/d0ta12486a
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COF membranes with uniform and exchangeable facilitated transport carriers for efficient carbon capture

Abstract: Facilitated transport membranes, with uniform distribution of the facilitated transport carriers, are highly desirable to reduce the separation energy barrier. Nevertheless, the disordered and random assembly of the membrane building...

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Cited by 61 publications
(30 citation statements)
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“…These results could be rationalized by the coadsorption process in the mixed gas separation process or by the adsorption of water that can enhance the CO 2 /CH 4 separation factor, as previously reported for related COFs. [29] These observations agree with the presence of imine groups into the COF cavities since it is known that the presence of some heteroatoms may enhance adsorption capacities of COFs. [30] A separation mechanism based on an adsorption-diffusion process is expected for imine-based COFs, in which imine groups located at the COFs pores favor the CO 2 adsorption due to weak interac- tions between the nitrogen of imine bond (Lewis bases) and CO 2 (Lewis acid).…”
Section: Resultssupporting
confidence: 83%
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“…These results could be rationalized by the coadsorption process in the mixed gas separation process or by the adsorption of water that can enhance the CO 2 /CH 4 separation factor, as previously reported for related COFs. [29] These observations agree with the presence of imine groups into the COF cavities since it is known that the presence of some heteroatoms may enhance adsorption capacities of COFs. [30] A separation mechanism based on an adsorption-diffusion process is expected for imine-based COFs, in which imine groups located at the COFs pores favor the CO 2 adsorption due to weak interac- tions between the nitrogen of imine bond (Lewis bases) and CO 2 (Lewis acid).…”
Section: Resultssupporting
confidence: 83%
“…These results could be rationalized by the coadsorption process in the mixed gas separation process or by the adsorption of water that can enhance the CO 2 /CH 4 separation factor, as previously reported for related COFs. [ 29 ]…”
Section: Resultsmentioning
confidence: 99%
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“…In addition to the LPE process, chemical exfoliation is another significant exfoliation technique. [30] For example, Banerjee et al prepared anthracene-based 2D COFs and chemically exfoliated the bulk COFs into 2D polymer nanosheets by using a simple cycloaddition reaction. [31] It is a commonly known fact that the 9-and 10-positions of anthracene units are sensitive toward [4 + 2] reaction.…”
Section: Top-down Methodsmentioning
confidence: 99%
“…Theh igh-quality iCOFNs provide defect-free ultrathin COF selective layers, endowing the membranes with high gas permeance and selectivity,achieving asignificant performance breakthrough in COF membranes for efficient CO 2 /CH 4 separation. [24] It is well known that high-pressure CO 2 will exert pronounced swelling and plasticization effects on polymer membranes with random pathways [25] and 2D membranes with interlayer channels, [26] leading to ap ermanent loss of selectivity.T oevaluate the stability against plasticization, the DhaTG Asp -150 membrane having both moderate permeance and selectivity was tested at elevated pressure.Asillustrated in Figure 4d,w ith increasing feed pressure to 5bar (corresponding to aC O 2 partial pressure of 1.5 bar), the CO 2 permeance and CO 2 /CH 4 selectivity maintain stable and exhibit aw eak dependence on pressure.T he robust framework structure contributes to the performance stability of DhaTG Asp membranes under various pressures,w hich is highly desirable for practical applications,d ispensing with the compression of feed gas streams. [27]…”
Section: Methodsmentioning
confidence: 99%