MOF based MMMs with enhanced selectivity due to hindered linker distortion

Diestel, Lisa; Wang, Nanyi; Schwiedland, Bärbel; Steinbach, Frank; Giese, U.; Caro, Jürgen

doi:10.1016/j.memsci.2015.04.069

Cited by 63 publications

(56 citation statements)

References 48 publications

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“…38 In the present work, GO/PI MMMs is developed for seawater desalination by the incorporation of GO into PI matrix polymer through a phase inversion method (Fig. 1).…”

Section: -32mentioning

confidence: 99%

Synthesis of graphene oxide/polyimide mixed matrix membranes for desalination

Feng

Huang

2017

RSC Adv.

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Nanohybrid graphene oxide (GO)/polyimide (PI) mixed matrix membranes (MMMs) were prepared by dispersing GO into PI through wet phase inversion method. The structure of GO/PI MMMs was characterized by using XRD, FT-IR and XPS. FESEM was used to analyze the morphology of the GO/PI MMMs. The hydrophilicity of the GO/PI MMMs was determined by static water contact angles. The performances of the GO/PI MMMs were evaluated for desalination of seawater through pervaporation.The GO/PI MMMs display excellent water permeability and salt rejection for desalination of different concentrations of seawater. At 90 C, the GO/PI MMMs exhibit a high water flux (36.1 kg m À2 h À1) and a high salt rejection (99.9%). Further, the GO/PI MMM displays a high stability for seawater desalination.This high separation performance combined with high stability and facile fabrication route recommend the developed GO/PI MMMs as a promising candidate for desalination of seawater.

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“…38 In the present work, GO/PI MMMs is developed for seawater desalination by the incorporation of GO into PI matrix polymer through a phase inversion method (Fig. 1).…”

Section: -32mentioning

confidence: 99%

Synthesis of graphene oxide/polyimide mixed matrix membranes for desalination

Feng

Huang

2017

RSC Adv.

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“…It seems that the polymer chains near to the surface of the filler particle become more structured. Since for the studied MMMs (ZIF-8/ Matrimid and ZIF-90/Matrimid) the glass transition temperature T g did increase by only a few degrees if the ZIF nanoparticles were incorporated into Matrimid [7], the effect of polymer rigidification takes place, but this alone cannot explain the experimental finding of a membrane selectivity which is much higher than the predicted one as shown in Fig. 5a shows that the Matrimid chains form an onion-like shell structure around an embedded nanoparticle.…”

Section: Polymer Rigidification Around the Nanofillermentioning

confidence: 96%

“…Two concepts for the possible influence of the polymer on mass transport through the MOF-polymer boundary are recently discussed in the literature: (1) The entry of the permeating molecules into the MOF is hindered as a result of hindered linker distortion by the surrounding polymer, which is a surface effect [7], and (2) the surrounding polymer reduces the framework flexibility of the embedded MOF, which is a bulk effect [21]. Two concepts for the possible influence of the polymer on mass transport through the MOF-polymer boundary are recently discussed in the literature: (1) The entry of the permeating molecules into the MOF is hindered as a result of hindered linker distortion by the surrounding polymer, which is a surface effect [7], and (2) the surrounding polymer reduces the framework flexibility of the embedded MOF, which is a bulk effect [21].…”

Section: Pore Size Narrowing Of the Mof In Contact With Polymermentioning

confidence: 99%

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MOF‐Based Mixed‐Matrix Membranes in Gas Separation – Mystery and Reality

Friebe

Diestel

Knebel

et al. 2016

Chemie Ingenieur Technik

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Microporous additives like nanosized metal-organic framework (MOF) particles can improve the gas separation performance of polymer membranes. These membranes which consist of added filler particles in a continuous polymer phase are called mixed-matrix membranes (MMM). While inorganic zeolites and organic polymers do not match well, the preparation of defect-free MOF-based MMMs is much easier. However, some problems can also occur during the preparation. Solutions how to avoid them and prepare perfect MMMs are given. In practical gas separation, the selectivity of the MMMs was found to be even higher than predicted by the Maxwell model.

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“…However, the substrates usually need to be pretreated to introduce nucleation sites for MOF crystals, which can be rather critical and complicated. Another drawback of the traditional solvothermal way is that most of MOF membranes are synthesized in organic solvents, such as N , N ‐dimethylformamide, methanol, toluene, and so forth, which only provide the liquid environment for MOF membrane growth and cannot be recycled thereafter. Grande et al demonstrated that the impact of using solvents in the MOF synthesis is considerable via life‐cycle assessment, and utilization of solvents should be avoided if possible or reutilization strategies should be envisaged if is not possible to eliminate them .…”

Section: Introductionmentioning

confidence: 99%

Solvent‐free route for metal–organic framework membranes growth aiming for efficient gas separation

et al. 2018

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Industrial applications of membranes based on metal–organic frameworks (MOFs) are challenged by their complex fabrication procedures and poor processability, despite their huge potential for efficient gas separation. Especially, the consumption of a large amount of toxic, expensive solvent, and harsh operation by conventional solvothermal growth also make it less attractive for industrial production. Herein, a solvent‐free method is proposed to fabricate continuous defect‐free MOF membranes on commercial porous stainless steel substrates, where the metal precursors are electrodeposited on the support followed by a heat treatment with the ligand powder via solid‐state reaction without using any solvent. This strategy is proven to be applicable for various MOF membranes and it is expected to be a facile, cheap, and environmental friendly way for future large‐scale production. © 2018 American Institute of Chemical Engineers AIChE J, 65: 712–722, 2019

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MOF based MMMs with enhanced selectivity due to hindered linker distortion

Cited by 63 publications

References 48 publications

Synthesis of graphene oxide/polyimide mixed matrix membranes for desalination

Synthesis of graphene oxide/polyimide mixed matrix membranes for desalination

MOF‐Based Mixed‐Matrix Membranes in Gas Separation – Mystery and Reality

Solvent‐free route for metal–organic framework membranes growth aiming for efficient gas separation

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