A simple seed-embedded method to prepare ZIF-8 membranes supported on flexible PESf hollow fibers

Zhang, Hangliao; Wang, Xiaobin; Wei, Luyang; Meng, Bo; Tan, Xiaoyao; Jin, Wanqin; Liu, Shaomin

doi:10.1016/j.jiec.2018.12.022

Cited by 30 publications

(17 citation statements)

References 55 publications

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“…1,2 Due to the special properties of dyes, dye wastewater is not only high in organic matter, poor in biochemistry, but also high in chroma, complex in composition and toxic. 3,4 Therefore, direct discharge or improper management will lead to the pollution of water and affect people’s physical health directly or indirectly through the food chain. Physical, chemical and biological treatment methods are commonly used to treat dye wastewater.…”

Section: Introductionmentioning

confidence: 99%

High performance polyvinylidene fluoride (PVDF) mixed matrix membrane (MMM) doped by various zeolite imidazolate frameworks

Liu

Chen

Mao

et al. 2020

High Performance Polymers

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Zeolitic imidazolate framework (ZIF-8) in three particle sizes (40, 70 and 100 nm) was prepared through both solvothermal and hydrothermal methods and employed to decorate polyvinylidene fluoride (PVDF). The finger-like macro-voids, sponge-like poly-porous morphology and surface roughness of prepared membranes were characterized by SEM and AFM microscopy. The FTIR spectrum and XPS analysis bear out the chemical component. ZIF-8 has the characteristics of higher porosity and appropriate pore size, which is a condition for improving the permeability and pollution resistance of the modified membrane. Results indicated that different ZIF-8s have different enhancement effects on PVDF MMM. 100 nm ZIF-8 membrane possessed pure water flux (PWF) of 350 L m−2h−1, which was 10 times more than the bare membrane (30 L m−2h−1), and OVA flux recovery ration (FRR%) is 98%. 40 nm ZIF-8 membrane owned BSA FRR% of 98.4%. The 70 nm ZIF-8 showed the best mechanical properties. The dynamic contact angles of UP-Z70 ranged from 104.5° to 62.5° within 180 s. Furthermore, pore size distribution, molecular weight cut-off (MWCO) and porosity were also researched to evaluate the MMM. The dislodge of Reactive Black KN-B, Reactive Red 3BS and Reactive Brilliant Blue KN-R dyes by MMM were studied under different dye concentrations and transmembrane pressures. The membrane can provide selective separation methods for dyes and Reactive Brilliant Blue KN-R up to 99%. Overall, the permeability, hydrophilicy, anti-fouling performance and wastewater treatment of modified membranes were regulated by the ZIF-8 in a steerable blending reaction modification process.

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Section: Introductionmentioning

confidence: 99%

High performance polyvinylidene fluoride (PVDF) mixed matrix membrane (MMM) doped by various zeolite imidazolate frameworks

Liu

Chen

Mao

et al. 2020

High Performance Polymers

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“…There are several MOF membranes successfully grown on polymer substrates. − However, considering the different mechanical properties between MOFs and polymers, polymer-supported MOF membranes have to be operated carefully to avoid any bending, otherwise the relatively fragile MOF membrane layers become damaged. − , On the basis of this, polypropylene (PP) with a smaller Young’s modulus difference from ZIF-8 is selected as the substrate to provide flexibility, thereby reducing any possible damage of the ZIF-8 membrane layer due to bending (Figure a).…”

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confidence: 99%

“…To the best of our knowledge, only a few works verified the flexibility of MOF membranes grown on polymeric substrates so far. − Chen et al synthesized ZIF-8 membranes on polyvinylidene fluoride (PVDF) hollow fiber, and the H 2 /CO 2 separation performance of the membrane could be almost maintained after bending with curvature of ∼77.7 m –1 . The curvature K of a bending is the reciprocal of the radius (curvature K = 1/ r ).…”

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confidence: 99%

“…The curvature K of a bending is the reciprocal of the radius (curvature K = 1/ r ). Liu et al reported a 4.5 μm thick ZIF-8 membrane on porous polyether sulfone (PESf) hollow fibers, which also displayed good H 2 /CO 2 separation performance after bending with curvature of ∼46 m –1 . Recently, Meng et al prepared ZIF-8 membranes on planar polysulfone (PSf) substrates, and the CO 2 /N 2 separation performance exhibited no change after bending with a curvature of 36.3 m –1 .…”

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confidence: 99%

“…Nevertheless, even after bending with a curvature of 222 m –1 , the gas separation performance of the PP-supported ZIF-8 membrane can still satisfy the requirements of commercial standard (C 3 H 6 permeability > 1 Barrer and C 3 H 6 /C 3 H 8 selectivity > 35). It is known that the flexibility of ZIF-8 can be attributed to its flexible Zn–Im–Zn linkages and large void spaces. , Compared with the state-of-the-art flexible polymer-supported ZIF-8 membranes (Figure S18 and Tables S5 and S6), our PP-supported ZIF-8 membranes exhibit higher flexibility in C 3 H 6 /C 3 H 8 separation, which may due to the thinner membrane and the smaller difference of Young’s modulus between PP substrate and ZIF-8. − In addition, as shown in Figure k (inset) and Table S7, the order of their Young’s modulus is as follows: PP-supported ZIF-8 membranes > Pt-coated PP substrate > bare PP substrate. Compared with that of the bare PP substrate, the Pt-coated PP substrate and ZIF-8 membranes exhibit better mechanical property although with sacrificial tensile strength …”

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confidence: 99%

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Flexible Polypropylene-Supported ZIF-8 Membranes for Highly Efficient Propene/Propane Separation

et al. 2020

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Metal–organic framework (MOF) membranes have enormous potential in separation applications. There are several MOF membranes grown on polymer substrates aimed for scale-up, but their brittleness hampers any industrial application. Herein, intergrown continuous polypropylene (PP)-supported ZIF-8 membranes have been successfully synthesized via fast current-driven synthesis (FCDS) within 1 h. The PP-supported ZIF-8 membranes exhibit a promising separation factor of 122 ± 13 for binary C3H6–C3H8 mixtures combined with excellent flexibility behavior. The C3H6/C3H8 separation performance of the PP-supported ZIF-8 membrane was found to be constant after bending the supported ZIF-8 film with a curvature of 92 m–1. This outstanding mechanical property is crucial for practical applications. Moreover, we further synthesized ZIF-8 membranes on various polymer substrates and even polymer hollow fibers to demonstrate the production scalability.

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Flexible Soft‐Solid Metal–Organic Framework Composite Membranes for H₂/CO₂ Separation

et al. 2022

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The development of a facile strategy to construct defect-free and flexible metal-organic framework (MOF)-based membranes with high selectivity and good scalability holds great appeal. Here we report the fabrication of soft-solid MOF composite membranes on polyvinylidene fluoride substrates. A representative membrane comprised of quasi-vertically grown lamellar Zn 2 (Bim) 4 (Bim = benzimidazolate) and lateral ultrathin polyamide film adhering to the MOF side facets. The straight interlayer galleries within unwrapped Zn 2 (Bim) 4 acted as predominant pathways, while the polyamide served the function of defect elimination, synergistically inducing an unprecedented H 2 /CO 2 selectivity of 1084 which set a new record for MOF-based membranes. Separation performance was held constant after membrane rolling up into a tube with a diameter of 3 mm or folding and unfolding at 90°for 50 times. ZIF-67 and ZIF-8 composite membranes based on this strategy also realized extremely high H 2 /CO 2 separation accuracies. These results, which demonstrate the intrinsic molecular sieving capability of MOFs, will promote the development of MOF-based membranes in practical separation applications.

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A simple seed-embedded method to prepare ZIF-8 membranes supported on flexible PESf hollow fibers

Cited by 30 publications

References 55 publications

High performance polyvinylidene fluoride (PVDF) mixed matrix membrane (MMM) doped by various zeolite imidazolate frameworks

High performance polyvinylidene fluoride (PVDF) mixed matrix membrane (MMM) doped by various zeolite imidazolate frameworks

Flexible Polypropylene-Supported ZIF-8 Membranes for Highly Efficient Propene/Propane Separation

Flexible Soft‐Solid Metal–Organic Framework Composite Membranes for H₂/CO₂ Separation

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A simple seed-embedded method to prepare ZIF-8 membranes supported on flexible PESf hollow fibers

Cited by 30 publications

References 55 publications

High performance polyvinylidene fluoride (PVDF) mixed matrix membrane (MMM) doped by various zeolite imidazolate frameworks

High performance polyvinylidene fluoride (PVDF) mixed matrix membrane (MMM) doped by various zeolite imidazolate frameworks

Flexible Polypropylene-Supported ZIF-8 Membranes for Highly Efficient Propene/Propane Separation

Flexible Soft‐Solid Metal–Organic Framework Composite Membranes for H2/CO2 Separation

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Flexible Soft‐Solid Metal–Organic Framework Composite Membranes for H₂/CO₂ Separation