High-Performance, Free-Standing Symmetric Hybrid Membranes for Osmotic Separation

Geng, Zhi; Liang, Shiqiang; Sun, Meng; Liu, Chuhan; He, Nan; Xia, Yang; Cui, Xiaochun; Wang, Fan; Wang, Xiaohong; Huo, Yang

doi:10.1021/acsami.0c22124

Cited by 7 publications

(6 citation statements)

References 61 publications

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“…trade-off. [103] The hybrid membranes showed an excellent water/ Na 2 SO 4 selectivity of 1208.4 L mol À1 , higher than that of the conventional membrane with 375.6 L mol À1 . Structural integrity was maintained during the long-term forward osmosis separation of high-salinity solution.…”

Section: Liquid Separationmentioning

confidence: 89%

“…In addition, benefitting from the introduction of NH 2 -MIL-125 MOFs, the prepared membranes allowed only water permeation but rejected salts via steric hindrance to approach the empirical permeability-selectivity Reproduced with permission. [103] Copyright 2021, American Chemical Society.…”

Section: Liquid Separationmentioning

confidence: 99%

“…In addition, benefitting from the introduction of NH 2 ‐MIL‐125 MOFs, the prepared membranes allowed only water permeation but rejected salts via steric hindrance to approach the empirical permeability–selectivity trade‐off. [ 103 ] The hybrid membranes showed an excellent water/Na 2 SO 4 selectivity of 1208.4 L mol −1 , higher than that of the conventional membrane with 375.6 L mol −1 . Structural integrity was maintained during the long‐term forward osmosis separation of high‐salinity solution.…”

Section: Application Of Mof Membranesmentioning

confidence: 99%

“…h) water flux ( J w ) and i) reverse salt flus ( J s ) for the 10% NH 2 -MIL-125/POD-COOH hybrid membranes with different thicknesses as a function of 0.5, 0.75, 1, 1.25, and 1.5 M Na 2 SO 4 DS. Reproduced with permission [103]. Copyright 2021, American Chemical Society.…”

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confidence: 99%

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Metal–Organic Framework Membranes: Advances, Fabrication, and Applications

Jia

Wang

et al. 2022

Small Structures

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Metal-organic frameworks (MOFs) are porous crystal frameworks constructed by metal clusters and bridging organic ligands. [1] This class of materials not only has a highly tunable and regular pore structure, variable functionality, and internal connectivity, [2] but the superior designability enables them to accommodate the introduction of a variety of functional sites on frames, cavities, and channels. [3] These make them have important applications in many fields, including drug delivery, [4] adsorption, [5] antimicrobials, [6] electron conduction, [7] gas storage, [8] catalysis, [9] sensing, [10] and energy conversion. [11] MOFs were first developed by Hoskins and Robson via connecting discrete metal clusters and reappraising the Zn(CN) 2 and Cd(CN) 2 structure [12] and then termed MOFs in 1995. [13] Recent researches focus on the modulation of MOF chemistry to expending our understanding of the relationship between the MOFs structure, function, and applications. However, the poor adhesion and heterogeneous distribution of powdery MOFs hindered their detection in many applications. So, the development of the commercialization of MOFs was limited. [14] Membrane is a kind of material with small pore size and large specific surface area. [15] A series of structural features facilitate its rapid transfer of matters with the action of external driving forces in the field of biomedical, [16] energy storage, [17] and environmental protection. [18] The preparation of MOFs into membranes will play their role to the maximum extent [14,19] and endow more precisely pore size, pore structure, and molecular-/ion-specific groups with the membranes. [20] MOF membranes are mainly divided into two categories: pure MOF membranes and MOF/polymer hybrid membranes. Pure MOF membranes are the continuous thin layers of MOFs that are formed by growing (or depositing) on a porous support layer and/or inorganic substrate or a porous polymer substrate. These kinds of MOF membranes have the advantages of good thermal stability, high mechanical property, antifouling, antiswelling, and controllable pore structure. [21] As pure MOF membranes are composed of MOFs, the permeability and selectivity are completely determined by the pore sizes of MOFs, which endow pure MOF membranes with significant selectivity. [22] Pure MOF membranes should have the best performance in theory. However, their brittle texture, high cost, and difficulty in chemical modification still limit their practical applications. MOF/polymer hybrid membranes are composite materials that are composed of a dispersed phase (MOFs) and a continuous phase (polymer or another flexible matrix). There are two forms: MOFs embedded in the polymer matrix and MOFs on the surface of the flexible substrate. The thickness is much thicker than the diameter of the embedded porous MOFs; thus, the doped MOFs are surrounded by the polymer matrix. In this case, the selectivity and permeability of the MOF/polymer hybrid membranes are significantly dependent on the properties of the

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Section: Liquid Separationmentioning

confidence: 89%

Section: Liquid Separationmentioning

confidence: 99%

Section: Application Of Mof Membranesmentioning

confidence: 99%

mentioning

confidence: 99%

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Metal–Organic Framework Membranes: Advances, Fabrication, and Applications

Jia

Wang

et al. 2022

Small Structures

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“…44,47 Thus, one of the most reliable methods for optimizing the mass transport of a given material is to develop free-standing membranes. 48,49 Polymers are often fabricated as free-standing membranes with their flexibility and processability. 50,51 However, they often suffer from permeability/selectivity limitations, known as Robeson upper bound.…”

Section: ■ Introductionmentioning

confidence: 99%

Free-Standing Metal–Organic Framework Membranes Made by Solvent-Free Space-Confined Conversion for Efficient H₂/CO₂ Separation

Gao

et al. 2023

ACS Appl. Mater. Interfaces

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Metal−organic frameworks (MOFs) are promising candidates for the advanced membrane materials based on their diverse structures, modifiable pore environment, precise pore sizes, etc. Nevertheless, the use of supports and large amounts of solvents in traditional solvothermal synthesis of MOF membranes is considered inefficient, costly, and environmentally problematic, coupled with challenges in their scalable manufacturing. In this work, we report a solvent-free space-confined conversion (SFSC) approach for the fabrication of a series of free-standing MOF (ZIF-8, Zn(EtIm) 2 , and Zn 2 (BIm) 4 ) membranes. This approach excludes the employment of solvents and supports that require tedious pretreatment and, thus, makes the process more environment-friendly and highly efficient. The free-standing membranes feature a robust and unique architecture, which comprise dense surface layers and highly porous interlayer with large amounts of irregular-shaped micron-scale pore cavities, inducing satisfactory H 2 /CO 2 selectivities and exceptional H 2 permeances. The ZIF-8 membrane affords a considerable H 2 permeance of 2653.7 GPU with a competitive H 2 /CO 2 selectivity of 17.1, and the Zn(EtIm) 2 membrane exhibits a high H 2 /CO 2 selectivity of 22.1 with an excellent H 2 permeance (6268.7 GPU). The SFSC approach potentially provides a new pathway for preparing free-standing MOF membranes under solvent-free conditions, rendering it feasible for scale-up production of membrane materials for gas separation.

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High performance forward osmosis membrane with ultrathin hydrophobic nanofibrous interlayer

Cheng

Meng

et al. 2023

Chemosphere

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High-Performance, Free-Standing Symmetric Hybrid Membranes for Osmotic Separation

Cited by 7 publications

References 61 publications

Metal–Organic Framework Membranes: Advances, Fabrication, and Applications

Metal–Organic Framework Membranes: Advances, Fabrication, and Applications

Free-Standing Metal–Organic Framework Membranes Made by Solvent-Free Space-Confined Conversion for Efficient H₂/CO₂ Separation

High performance forward osmosis membrane with ultrathin hydrophobic nanofibrous interlayer

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High-Performance, Free-Standing Symmetric Hybrid Membranes for Osmotic Separation

Cited by 7 publications

References 61 publications

Metal–Organic Framework Membranes: Advances, Fabrication, and Applications

Metal–Organic Framework Membranes: Advances, Fabrication, and Applications

Free-Standing Metal–Organic Framework Membranes Made by Solvent-Free Space-Confined Conversion for Efficient H2/CO2 Separation

High performance forward osmosis membrane with ultrathin hydrophobic nanofibrous interlayer

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Product

Resources

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Free-Standing Metal–Organic Framework Membranes Made by Solvent-Free Space-Confined Conversion for Efficient H₂/CO₂ Separation