Pore engineering of ultrathin covalent organic framework membranes for organic solvent nanofiltration and molecular sieving

Shinde, Digambar Balaji; Cao, Li; Wonanke, A. D. Dinga; Li, Xiang; Kumar, Sushil; Liu, Xiaowei; Hedhili, Mohamed N.; Emwas, Abdul‐Hamid; Addicoat, Matthew A.; Huang, Kuo‐Wei; Lai, Zhiping

doi:10.1039/d0sc01679a

Cited by 86 publications

(56 citation statements)

References 47 publications

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“…In addition to the difficulties related to the fabrication of defect-free and continuous COF selective layers, the main reason is due to the wide nanometer-sized pores of the COF family (typically 0.8–5 nm) 37 , 38 , which are much larger than the kinetic diameter of common gas molecules (0.25–0.50 nm) 39 . The reported approaches to mitigate this including the introduction of side groups into COF cavity walls 40 – 44 or staggered stacking of 2D COFs 45 – 49 can reduce the aperture size into the microporous range, but it is difficult to form effective and uniform molecular channels in the resulting membrane for precise size sieving in gas mixture separation.…”

Section: Introductionmentioning

confidence: 99%

MOF-in-COF molecular sieving membrane for selective hydrogen separation

et al. 2021

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Covalent organic frameworks (COFs) are promising materials for advanced molecular-separation membranes, but their wide nanometer-sized pores prevent selective gas separation through molecular sieving. Herein, we propose a MOF-in-COF concept for the confined growth of metal-organic framework (MOFs) inside a supported COF layer to prepare MOF-in-COF membranes. These membranes feature a unique MOF-in-COF micro/nanopore network, presumably due to the formation of MOFs as a pearl string-like chain of unit cells in the 1D channel of 2D COFs. The MOF-in-COF membranes exhibit an excellent hydrogen permeance (>3000 GPU) together with a significant enhancement of separation selectivity of hydrogen over other gases. The superior separation performance for H2/CO2 and H2/CH4 surpasses the Robeson upper bounds, benefiting from the synergy combining precise size sieving and fast molecular transport through the MOF-in-COF channels. The synthesis of different combinations of MOFs and COFs in robust MOF-in-COF membranes demonstrates the versatility of our design strategy.

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Section: Introductionmentioning

confidence: 99%

MOF-in-COF molecular sieving membrane for selective hydrogen separation

et al. 2021

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“…Covalent organic frameworks (COFs) are a class of crystalline porous materials comprised of periodic organic building blocks held together by covalent bonds. The collective properties of high stability, permanent porosity, and low density hold great promise for molecular transport/separation, [1][2][3][4] and energy storage devices. [5][6][7][8][9] In particular, properly stacked 2D COFs with well-defined pore channels and stable skeletons are ideal platforms for ionic (e.g., Li + ) transport.…”

Section: Introductionmentioning

confidence: 99%

Covalent Assembly of Two‐Dimensional COF‐on‐MXene Heterostructures Enables Fast Charging Lithium Hosts

Guo

Ming

Shinde

et al. 2021

Adv Funct Materials

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105

103

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2D heterostructured materials combining ultrathin nanosheet morphology, defined pore configuration, and stable hybrid compositions, have attracted increasing attention for fast mass transport and charge transfer, which are highly desirable features for efficient energy storage. Here, the chemical space of 2D-2D heterostructures is extended by covalently assembling covalent organic frameworks (COFs) on MXene nanosheets. Unlike most COFs, which are generally produced as solid powders, ultrathin 2D COF-LZU1 grows in situ on aminated Ti 3 C 2 T x nanosheets with covalent bonding, producing a robust MXene@COF heterostructure with high crystallinity, hierarchical porosity, and conductive frameworks. When used as lithium hosts in Li metal batteries, lithium storage and charge transport are significantly improved. Both spectroelectrochemical and theoretical analyses demonstrate that lithiated COF channels are important as fast Li + transport layers, by which Li ions can be precisely nucleated. This affords dendrite-free and fast-charging anodes, which would be difficult to achieve using individual components.

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“…(2) Interfacial polymerisation. [14][15][16][17][18][19][20] The monomers in two immiscible solvents counter diffuse to liquid-liquid or liquid-air interfaces and COF membranes are formed at these interfaces. This method can produce thin and free-standing membranes, but produced membranes are usually devoid of high compactness which leads to low separation performance.…”

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confidence: 99%

Screen printing directed synthesis of covalent organic framework membranes with water sieving property

Rong

Chen

et al. 2020

Chem. Commun.

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Pore engineering of ultrathin covalent organic framework membranes for organic solvent nanofiltration and molecular sieving

Abstract: Pore surface engineering of ultrathin COF membranes by introducing different lengths of alkyl chains into the skeleton, which allows us to precisely control the pore size of COF membranes for OSN applications and molecular sieving.

Cited by 86 publications

References 47 publications

MOF-in-COF molecular sieving membrane for selective hydrogen separation

MOF-in-COF molecular sieving membrane for selective hydrogen separation

Covalent Assembly of Two‐Dimensional COF‐on‐MXene Heterostructures Enables Fast Charging Lithium Hosts

Screen printing directed synthesis of covalent organic framework membranes with water sieving property

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