Aqueous Cathodic Deposition: Aqueously Cathodic Deposition of ZIF‐8 Membranes for Superior Propylene/Propane Separation (Adv. Funct. Mater. 7/2020)

Wei, Ruicong; Chi, Heng‐Yu; Li, Xiang; Lu, Dongwei; Wan, Yi; Yang, Chih‐Wen; Lai, Zhiping

doi:10.1002/adfm.202070042

Cited by 15 publications

(15 citation statements)

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“… − Polymer membranes, although being widespread employed in diverse industrial separation applications, commonly suffered from intrinsic permeability selectivity trade-off, fouling, degradation, or material failure upon operating under harsh conditions . In this regard, metal–organic framework (MOF) membranes not only complement existing polymer membranes but also open new possibilities for industrial separation applications, relying on the well-defined pore aperture, tailorable pore size, versatile functionality, structural robustness, and high thermal/chemical stability. − Taking ZIF-8 membranes, one of the most extensively studied MOF membranes as an example, a variety of solution − and vapor based synthetic protocols have been developed for the preparation of ZIF-8 membranes with commercially attractive C 3 H 6 /C 3 H 8 selectivity (>35). Nevertheless, it remained a great challenge for balancing process sustainability and performance superiority.…”

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confidence: 99%

“…Nevertheless, it remained a great challenge for balancing process sustainability and performance superiority. For instance, diverse solution-based synthetic methods (such as aqueous solution processing, contra-diffusion synthesis, sol–gel synthesis, current-driven synthesis, and interfacial microfluidic processing) easily enabled the formation of well-intergrown ZIF-8 membranes exhibiting exceptional C 3 H 6 /C 3 H 8 selectivity. In a recent research, Nair et al prepared several types of all-nanoporous hybrid membranes (ANHMs) through combing ZIF-8 with MFI nanoparticles/nanosheets.…”

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confidence: 99%

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Beyond Solution-Based Protocols: MOF Membrane Synthesis in Supercritical Environments for an Elegant Sustainability Performance Balance

Liu

Song

et al. 2020

ACS Materials Lett.

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Supercritical fluids (SCFs) represent materials at temperatures and pressures above their critical points where distinct liquid and gas phases do not exist. SCFs possess several unique properties rendering them excellently adapted for the reaction medium of MOF membranes (like ZIF-8) which, although offering an energyefficient and eco-friendly option for large-scale industrial separation, are still experiencing a dilemma between process sustainability and performance superiority. In this study we addressed this issue through a facile SCF synthetic protocol employing supercritical CO 2 (scCO 2 ) as the reaction medium. Relying on the near-zero surface tension, low viscosity, and high diffusivity of scCO 2 , nanoscale intercrystalline defects could be effectively patched, resulting in the formation of well-intergrown ZIF-8 membranes with commercially attractive olefin/paraffin (C 3 H 6 / C 3 H 8 ) separation performance. Moreover, after the SCF processing, both discharged CO 2 and unreacted ligands could be conveniently recovered and reutilized, resulting in zero pollutant discharge due to the controllable phase transition, variable solubility, and chemical inertness of scCO 2 . This work sheds lights on the promising prospects of SCF processing for sustainable fabrication of high-performing MOF membranes.

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confidence: 99%

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confidence: 99%

Beyond Solution-Based Protocols: MOF Membrane Synthesis in Supercritical Environments for an Elegant Sustainability Performance Balance

Liu

Song

et al. 2020

ACS Materials Lett.

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“…The region‐selective deposition of TpEB nuclei is helpful to prevent the obtained films from intrinsic defects, suggesting a self‐repairing ability in the film formation to ensure its integrity. [ 30 ] This inference is further validated by the digital and SEM images of cathode ITO supports after different synthesis durations (Figure S2, Supporting Information). In the final stage of film formation, the continuous but non‐conductive TpEB covering is likely to act as an isolating layer to restrain the excessive growth, which results in a self‐limiting growth of TpEB films to give reduced thicknesses, analogous to the films prepared by interfacial strategies.…”

Section: Resultsmentioning

confidence: 56%

Electrosynthesis of Ionic Covalent Organic Frameworks for Charge‐Selective Separation of Molecules

Wang

Yang

Shi

et al. 2022

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Up to now, an array of effective strategies, such as interfacial polymerization, [4] solvothermal growth, [5] and nanosheet assembly, [6] have been progressively developed to produce homogeneous COF-based membranes for molecular and ionic separations. Among these currently available methods, COF selective layers are either directly synthesized on porous supports or crystallized at the interface followed by transferring onto supports. Thus, the accessibility to COF membranes is substantially contingent upon the strict and rational design of the substrate properties, including pore sizes, solvent resistance, and surface functionality. [7] Moreover, due to the lack of feasible and high-efficiency methods, improving the productivity of COF membranes still faces a major challenge. Being challenged by these obstacles, it is imperative to explore innovative synthesis strategies enabling the facile and highly efficient production of COF membranes on various supports.Electrosynthesis has been widely employed as a viable approach to generating thin films on a wide range of conductive substrates. [8] It stands out among the existing film fabrication techniques mainly due to its highlighted merits including high productivity and mild operation conditions. [9] Also importantly, precise control over the film growth can be readily exerted by adjusting the electrical parameters, resulting in wellregulated film structures. [10] The implementation of growing diverse films, comprised of metal-organic frameworks (MOFs), [11] conjugated microporous polymers (CMPs), [12] hydrogen-bonded organic frameworks (HOFs), [13], etc., [14] manifestly illustrates the prominent feasibility and universality of this methodology. Electrochemical polymerization and electrophoretic deposition are the two main approaches to the preparation of separation membranes via electrosynthesis. Electrochemical polymerization relies on the electrically triggered reactions on electrodes, which start from molecular building blocks. [15] For example, Lai et al. reported the electropolymerization strategy to fabricate CMP membranes for high-precision separations. [16] Additionally, a current-driven method has been proposed for fabricating MOF membranes on inorganic and organic substrates, with significantly shortened synthesis durations of several minutes. [17] Alternatively, the electrophoretic deposition focuses on the Covalent organic frameworks (COFs) have emerged as potent material platforms for engineering advanced membranes to tackle challenging separation demands. However, the synthesis of COF membranes is currently hampered by suboptimal productivity and harsh synthesis conditions, especially for ionic COFs with perdurable charges. Herein, ionic COFs with charged nanochannels are electrically synthesized on conductive supports to rapidly construct composite membranes for charge-selective separations of small molecules. The intrinsic charging nature and strong charge intensity of ionic COFs are demonstrated to collectively dominate the membrane growth. Spo...

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“…further developed electrochemical deposition using water as the solvent without addition of any electrolyte or modulator. [ 72 ] Vapor deposition is also a simple and controllable process, such as the gel–vapor deposition (GVD) method (Figure 8b). [ 73 ] However, solvent cannot be avoided during the overall GVD process.…”

Section: Membranes: Chemistries Materials and Structuresmentioning

confidence: 99%

Membrane‐Based Olefin/Paraffin Separations

et al. 2020

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Efficient olefin/paraffin separation is a grand challenge because of their similar molecular sizes and physical properties, and is also a priority in the modern chemical industry. Membrane separation technology has been demonstrated as a promising technology owing to its low energy consumption, mild operation conditions, tunability of membrane materials, as well as the integration of physical and chemical mechanisms. In this work, inspired by the physical mechanism of mass transport in channel proteins and the chemical mechanism of mass transport in carrier proteins, recent progress in channel-based and carrier-based membranes toward olefin/paraffin separations is summarized. Further, channel-based membranes are categorized into membranes with network structures and with framework structures according to the morphology of channels. The separation mechanisms, separation performance, and membrane stability in channel-based and carrier-based membranes are elaborated. Future perspectives toward membrane-based olefin/paraffin separation are proposed.

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Aqueous Cathodic Deposition: Aqueously Cathodic Deposition of ZIF‐8 Membranes for Superior Propylene/Propane Separation (Adv. Funct. Mater. 7/2020)

Cited by 15 publications

References 0 publications

Beyond Solution-Based Protocols: MOF Membrane Synthesis in Supercritical Environments for an Elegant Sustainability Performance Balance

Beyond Solution-Based Protocols: MOF Membrane Synthesis in Supercritical Environments for an Elegant Sustainability Performance Balance

Electrosynthesis of Ionic Covalent Organic Frameworks for Charge‐Selective Separation of Molecules

Membrane‐Based Olefin/Paraffin Separations

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