Polycrystalline metal-organic framework (MOF) membranes for molecular separations: Engineering prospects and challenges

Hamid, Mohamad Rezi Abdul; Qian, Yutian; Wei, Ruicong; Li, Zhen; Pan, Yichang; Lai, Zhiping; Jeong, Hae‐Kwon

doi:10.1016/j.memsci.2021.119802

Cited by 65 publications

(28 citation statements)

References 223 publications

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“…Metal organic frameworks (MOFs), a type of microporous polycrystalline materials, have drawn research attention owing to its high porosity, tunable structural and chemical properties, and ease of synthesis ( 1 , 2 ). MOFs have one or multiple channels in different crystallographic orientations.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotube supported oriented metal organic framework membrane for effective ethylene/ethane separation

et al. 2022

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Zeolitic imidazolate framework 8 (ZIF-8) is effective for C 3 H 6 /C 3 H 8 separation because of the “sieving effect” of a six-membered (6-M) window. Here, we demonstrate that ZIF-8 is a versatile material that could effectively separate C 2 H 4 from C 2 H 6 via its 4-M window along the <100> direction. We established a facile and environmentally friendly carbon nanotube (CNT)–induced oriented membrane (CNT-OM) approach to fabricate a {100}-oriented ZIF-8 membrane (100-M). In this approach, 2-methyimidazole was anchored onto the CNT surface followed by 3-hour in situ growth in aqueous solution at room temperature. The obtained 100-M, whose 4-M window is aligned along the transport pathway, showed ~3 times higher C 2 H 4 /C 2 H 6 selectivity than a randomly oriented membrane. Thus, this work demonstrates that the membrane orientation plays an important role in tuning selectivity toward different gas pairs. Furthermore, 100-M exhibited excellent mechanical stability that could sustain the separation performance after bending at a curvature of ~109 m −1 .

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Section: Introductionmentioning

confidence: 99%

Carbon nanotube supported oriented metal organic framework membrane for effective ethylene/ethane separation

et al. 2022

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“…Metal–organic frameworks (MOFs) are important materials for sustainable development and find applications in gas storage, compound separation, , adsorption of organic and inorganic contaminants, , depollution, energy, , catalysis, antimicrobials, food packaging, and photodynamic therapy, to cite a few. These materials distinguish themselves by being built upon metallic nodes and organic linkers forming porous two-dimensional (2D) and three-dimensional (3D) semiconducting frameworks, each playing active roles such as coordinating guest molecules, redox activities, and heavy atom effects on the excited state dynamics.…”

Section: Introductionmentioning

confidence: 99%

Structural Influence on Exciton Migration and Singlet Oxygen Photosensitization in Porphyrinic Metal–Organic Coordination Networks

et al. 2022

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A hexagonal three-dimensional (3D) metal−organic coordination network (MOCN) [(ZnTPyP)•0.75 DMSO] n (3D Helix) and a one-dimensional (1D) coordination polymer [(ZnTPyP)•DMF] n (1D Ladder) (ZnTPyP = 5,10,15,porphyrinatozinc(II)) are prepared and their photophysical properties are investigated to assess their ability to promote efficient exciton energy migration through singlet−singlet annihilation processes and to photosensitize singlet oxygen ( 1 O 2(g) ). The presence and absence of annihilation in 3D Helix and 1D Ladder, respectively, are indicative of their ability to efficiently promote exciton migration. Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations were used to demonstrate the presence of interporphyrin couplings in the 3D Helix structure. Using Forster's theory of energy transfer, the relative efficiencies of exciton migration across the bulk were correlated with the structural parameter κ 2 / r 6 , indicative of the relative orientations and distance between the donor and acceptor. Concurrently, based on the magnitude of 1 O 2(g) phosphorescence (1280 nm), it was noted that 3D Helix photosensitizes 1 O 2(g) more efficiently than 1D Ladder (by roughly 1 order of magnitude). During this study, a new two-dimensional (2D)-MOCN was prepared, 2D Grid [(ZnTPyP)•4CHCl 3 ] n , but weak Zn•••N interactions and evaporation of CHCl 3 transformed 2D Grid into a multiphasic mixture (ZnTPyP Morph) containing both 3D Helix and other 1D ladder-like species.

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“…Metal–organic frameworks (MOFs) are an emerging class of porous crystalline material formed through the coordination of organic linkers with metallic clusters. The highly ordered pore topology of MOFs makes them ideal candidates for membrane separation. , In 2009, researchers − first developed deposition techniques capable of fabricating pure MOF membranes for gas separation. − Since that time, a plethora of polycrystalline MOF membranes have been developed for separation systems; − however, MOF membranes have not yet been applied to gas separation on commercial scales . In laboratory studies, researchers demonstrated that pure MOF membranes are capable of H 2 /CO 2 − and C 3 H 6 /C 3 H 8 separation with performance on par with that of polymeric membranes. − Despite the enormous variety of MOF structures that could potentially be used for the preparation of membranes, the availability of MOF membranes for C 3 H 6 /C 3 H 8 separation remains limited. − Furthermore, only very few pure MOF membranes enable the high-performance separation of CO 2 /N 2 , CO 2 /CH 4 , or N 2 /CH 4 .…”

Section: Introductionmentioning

confidence: 99%

X-ray Diffraction and Molecular Simulations in the Study of Metal–Organic Frameworks for Membrane Gas Separation

2022

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For more than a decade, researchers have been developing metal–organic frameworks (MOFs) in the form of pure MOF membranes as well as MOF-containing mixed-matrix membranes. MOF membranes have been used for H2/CO2 or C3H6/C3H8 separation, but relatively few MOF membranes enable the high-performance separation of CO2/N2, CO2/CH4, or N2/CH4. This article describes the use of in situ XRD analysis and molecular simulation to elucidate gas transport within MOFs and derivative membranes at the molecular level. In a review of recent studies by the authors and other research groups, this article examines the flexibility of MOFs initiated by activation, gas adsorption, and aging effects during gas permeation. This article also discusses the application of XRD analysis in conjunction with computational methods to investigate the CO2–MOF Coulombic interaction and its effects on CO2 separation. Note that this combined analysis approach is also useful in studying the effects of linker rotation on N2/CH4 separation. This article also examines the use of computational tools in identifying new MOFs for gas separation and, more importantly, in elaborating the relationship between the structure of MOFs and their corresponding gas transport properties.

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Polycrystalline metal-organic framework (MOF) membranes for molecular separations: Engineering prospects and challenges

Cited by 65 publications

References 223 publications

Carbon nanotube supported oriented metal organic framework membrane for effective ethylene/ethane separation

Carbon nanotube supported oriented metal organic framework membrane for effective ethylene/ethane separation

Structural Influence on Exciton Migration and Singlet Oxygen Photosensitization in Porphyrinic Metal–Organic Coordination Networks

X-ray Diffraction and Molecular Simulations in the Study of Metal–Organic Frameworks for Membrane Gas Separation

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