Polycrystalline zirconium metal-organic framework membranes supported on flexible carbon cloth for organic solvent nanofiltration

Cai, Yahui; Shi, Dongchen; Liu, Guoliang; Ying, Yunpan; Cheng, Youdong; Wang, Yuxiang; Chen, Dongyun; Lu, Jian‐Mei; Zhao, Dan

doi:10.1016/j.memsci.2020.118551

Cited by 34 publications

(23 citation statements)

References 51 publications

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“…A similar approach for 2D membranes was demonstrated by Cai et al [62] They successfully fabricated a continuous polycrystalline UiO-66(Zr)-NH 2 membrane, which was supported on a flexible carbon cloth substrate (Figure 4h). Through carboxylation, the flexible carbon cloth was systematically optimized to form an acidified carbon cloth.…”

Section: In Situ Growthmentioning

confidence: 82%

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Macroscopic MOF Architectures: Effective Strategies for Practical Application in Water Treatment

Yao

Wang

et al. 2021

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Metal–organic frameworks (MOFs) have potential applications in removing pollutants such as heavy metals, oils, and toxins from water. However, due to the intrinsic fragility of MOFs and their fine powder form, there are still technical barriers to their practical application such as blockage of pipes, difficulty in recovery, and potential environmental toxicity. Therefore, attention has focused on approaches to convert nanocrystalline MOFs into macroscopic materials to overcome these limitations. Recently, strategies for shaping MOFs into beads (0D), nanofibers (1D), membranes (2D), and gels/sponges (3D) with macrostructures are developed including direct mixing, in situ growth, or deposition of MOFs with polymers, cotton, foams or other porous substrates. In this review, successful strategies for the fabrication of macroscopic materials from MOFs and their applications in removing pollutants from water including adsorption, separation, and advanced oxidation processes, are discussed. The relationship between the macroscopic performance and the microstructure of materials, and how the range of 0D to 3D macroscopic materials can be used for water treatment are also outlined.

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Section: In Situ Growthmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

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Macroscopic MOF Architectures: Effective Strategies for Practical Application in Water Treatment

Yao

Wang

et al. 2021

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“…To reduce the significant energy consumption associated with traditional separation technologies, nanofiltration separation has been proposed as a lower‐energy alternative plan. Cai et al [ 112 ] designed continuous polycrystalline UiO‐66(Zr)‐NH 2 membranes on a flexible CC substrate by substrate pretreatment, in situ growth, and postsynthetic defect healing (Figure 15g). A schematic illustration of the preparation process of polycrystalline UiO‐66‐NH 2 is shown in Figure 15j.…”

Section: Application Of Mof Membranesmentioning

confidence: 99%

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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“…MOFs have been widely used as membrane materials for gas separation, [109][110][111] water treatment, [112,113] and OSN [114][115][116][117] due to their abundant porous structures, chemical versatility, and functionalities. [112,118] However, the application of 2D structured MOFs for membrane-based separation is much less compared with their 3D structured counterparts.…”

Section: Other 2d Materialsmentioning

confidence: 99%

2D Material Based Advanced Membranes for Separations in Organic Solvents

Sui

Yuan

et al. 2020

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2D materials have shown high potentials for fabricating next‐generation membranes. To date, extensive studies have focused on the applications of 2D material membranes in gas and aqueous media. Recently, compelling opportunities emerge for 2D material membranes in separation applications in organic solvents because of their unique properties, such as ultrathin mono‐ to few‐layers, outstanding chemical resistance toward organic solvents. Hence, this review aims to provide a timely overview of the current state‐of‐the‐art of 2D material membranes focusing on their applications in organic solvent separations. 2D material membranes fabricated using graphene materials and a few representative nongraphene‐based 2D materials, including covalent organic frameworks and MXenes, are summarized. The key membrane design strategies and their effects on separation performances in organic solvents are also examined. Last, several perspectives are provided in terms of the critical challenges for 2D material membranes, including standardization of membrane performance evaluation, improving understandings of separation mechanisms, managing the trade‐off of permeability and selectivity, issues related to application versatility, long‐term stability, and fabrication scalability. This review will provide a useful guide for researchers in creating novel 2D material membranes for advancing new separation techniques in organic solvents.

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Polycrystalline zirconium metal-organic framework membranes supported on flexible carbon cloth for organic solvent nanofiltration

Cited by 34 publications

References 51 publications

Macroscopic MOF Architectures: Effective Strategies for Practical Application in Water Treatment

Macroscopic MOF Architectures: Effective Strategies for Practical Application in Water Treatment

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

2D Material Based Advanced Membranes for Separations in Organic Solvents

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