COF membranes with uniform and exchangeable facilitated transport carriers for efficient carbon capture

Yang, Long; Yang, Hao; Wu, Hong; Zhang, Leilang; Ma, Hanze; Liu, Yutao; Wu, Yingzhen; Ren, Yanxiong; Wu, Xingyu; Jiang, Zhongyi

doi:10.1039/d0ta12486a

Cited by 58 publications

(29 citation statements)

References 44 publications

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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%

Section: Resultsmentioning

confidence: 99%

“…Therefore, the sorption and diffusion of CH 4 molecules into the COF-membranes are retarded. [29] Additionally, it has been already reported that the presence of moisture in the COF pores can enhance the CO 2 /CH 4 separation factor due to water adsorption, [29] in which the presence of water in the membranes reduces gas permeabilities due to lower gas diffusivities and solubilities (i.e., higher CO 2 sorption in water overwhelms the reduced CO 2 diffusivity due to the strong affinity between CO 2 molecules and water molecules in terms of permeability. [31] It is worth noting that permeability is the product of solubility and diffusivity.…”

Section: Resultsmentioning

confidence: 99%

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Ultralarge Free‐Standing Imine‐Based Covalent Organic Framework Membranes Fabricated via Compression

et al. 2022

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Demand continues for processing methods to shape covalent organic frameworks (COFs) into macroscopic objects that are needed for their practical applications. Herein, a simple compression method to prepare large‐scale, free‐standing homogeneous and porous imine‐based COF‐membranes with dimensions in the centimeter range and excellent mechanical properties is reported. This method entails the compression of imine‐based COF‐aerogels, which undergo a morphological change from an elastic to plastic material. The COF‐membranes fabricated upon compression show good performances for the separation of gas mixtures of industrial interest, N2/CO2 and CH4/CO2. It is believed that the new procedure paves the way to a broader range of COF‐membranes.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Ultralarge Free‐Standing Imine‐Based Covalent Organic Framework Membranes Fabricated via Compression

et al. 2022

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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%

2D Polymer Nanosheets for Membrane Separation

et al. 2022

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Since the discovery of single-layer graphene in 2004, the family of 2D inorganic nanosheets is considered as ideal membrane materials due to their ultrathin atomic thickness and fascinating physicochemical properties. However, the intrinsically nonporous feature of 2D inorganic nanosheets hinders their potential to achieve a higher flux to some extent. Recently, 2D polymer nanosheets, originated from the regular and periodic covalent connection of the building units in 2D plane, have emerged as promising candidates for preparing ultrafast and highly selective membranes owing to their inherently tunable and ordered pore structure, light weight, and high specific surface. In this review, the synthetic methodologies (including top-down and bottom-up methods) of 2D polymer nanosheets are first introduced, followed by the summary of 2D polymer nanosheets-based membrane fabrication as well as membrane applications in the fields of gas separation, water purification, organic solvent separation, and ion exchange/transport in fuel cells and lithium-sulfur batteries. Finally, based on their current achievements, the authors' personal insights are put forward into the existing challenges and future research directions of 2D polymer nanosheets for membrane separation. The authors believe this comprehensive review on 2D polymer nanosheets-based membrane separation will definitely inspire more studies in this field.

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“…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%

Oil–Water–Oil Triphase Synthesis of Ionic Covalent Organic Framework Nanosheets

Guo

Jiang

et al. 2021

Angewandte Chemie

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Ionic covalent organic framework nanosheets (iCOFNs) with long-range ordered and mono-dispersed ionic groups hold great potential in many advanced applications. Considering the inherent drawbacks of oil-water biphase method, herein, we explore an oil-water-oil triphase method based on phase engineering strategy for the bottom-up synthesis of iCOFNs.The middle water phase serves as aconfined reaction region, and the two oil phases are reservoirs for storing and supplying monomers to the water phase.Al arge aqueous space and lowm onomer concentration lead to the anisotropic gradual growth of iCOFNs into few-layer thickness,l arge lateral size, and high crystallinity.N otably,t he resulting three cationic and anionic iCOFNs exhibit ultra-high aspect ratios of up to 20,000. We further demonstrate their application potential by processing into ultrathin defect-free COF membranes for efficient biogas separation. Our triphase method may offer an alternative platform technology for the synthesis and innovative applications of iCOFNs.

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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...

Cited by 58 publications

References 44 publications

Ultralarge Free‐Standing Imine‐Based Covalent Organic Framework Membranes Fabricated via Compression

Ultralarge Free‐Standing Imine‐Based Covalent Organic Framework Membranes Fabricated via Compression

2D Polymer Nanosheets for Membrane Separation

Oil–Water–Oil Triphase Synthesis of Ionic Covalent Organic Framework Nanosheets

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