Shape Controlled Hierarchical Porous Hydrophobic/Oleophilic Metal‐Organic Nanofibrous Gel Composites for Oil Adsorption

Jayaramulu, Kolleboyina; Geyer, Florian; Petr, Martin; Zbořil, Radek; Vollmer, Doris; Fischer, Roland A.

doi:10.1002/adma.201605307

Cited by 165 publications

(119 citation statements)

References 53 publications

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“…A promising class of novel systems are 2D inorganic-organic hybrid materials derived from crystalline coordination networks, in particular from metal-organic frameworks (MOFs). [11][12][13][14][15] In general, MOFs are based on the self-assembly of metal 2D layered materials, including metal-di-chalcogenides and transition metal layered double hydroxides, among others, are intensively studied because of new properties that emerge from their 2D confinement, which are attractive for advanced applications. Herein, 2D cobalt ion (Co 2+ ) and benzimidazole (bIm) based zeolite-imidazole framework nanosheets, ZIF-9(III), are reported as exceptionally efficient electrocatalysts for the oxygen evolution reaction (OER).…”

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confidence: 99%

Ultrathin 2D Cobalt Zeolite‐Imidazole Framework Nanosheets for Electrocatalytic Oxygen Evolution

et al. 2018

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Abstract2D layered materials, including metal‐di‐chalcogenides and transition metal layered double hydroxides, among others, are intensively studied because of new properties that emerge from their 2D confinement, which are attractive for advanced applications. Herein, 2D cobalt ion (Co2+) and benzimidazole (bIm) based zeolite‐imidazole framework nanosheets, ZIF‐9(III), are reported as exceptionally efficient electrocatalysts for the oxygen evolution reaction (OER). Specifically, liquid‐phase ultrasonication is applied to exfoliate a [Co4(bIm)16] zeolite‐imidazole framework (ZIF), named as ZIF‐9(III) phase, into nanoscale sheets. ZIF‐9(III) is selectively prepared through simple mechanical grinding of cobalt nitrate and benzimidazole in the presence of a small amount of ethanol. The resultant exfoliated nanosheets exhibit significantly higher OER activity in alkaline conditions than the corresponding bulk phases ZIF‐9 and ZIF‐9(III). The electrochemical and physicochemical characterization data support the assignment of the OER activity of the exfoliated nanosheet derived material to nitrogen coordinated cobalt oxyhydroxide N4CoOOH sites, following a mechanism known for Co‐porphyrin and related systems. Thus, exfoliated 2D nanosheets hold promise as potential alternatives to commercial noble metal electrocatalysts for the OER.

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Ultrathin 2D Cobalt Zeolite‐Imidazole Framework Nanosheets for Electrocatalytic Oxygen Evolution

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“…The results indicated the presence of an adsorption competition between water and toluene in the adsorbents. Many studies have also shown the great potential of hydrophobic MOFs or their derived materials for bulk oil/water separation and bulk oil adsorption from water for the cleanup of oil spills . The removal of other types of harmful or useful gases or organic substances, such as ethylene, acetic acid, thiophene, peptides, aromatic amino acids, and pharmaceuticals, from air or water by hydrophobic MOFs and their derived materials has also been documented.…”

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confidence: 99%

Hydrophobic Metal–Organic Frameworks: Assessment, Construction, and Diverse Applications

et al. 2020

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Tens of thousands of metal–organic frameworks (MOFs) have been developed in the past two decades, and only ≈100 of them have been demonstrated as porous and hydrophobic. These hydrophobic MOFs feature not only a rich structural variety, highly crystalline frameworks, and uniform micropores, but also a low affinity toward water and superior hydrolytic stability, which make them promising adsorbents for diverse applications, including humid CO2 capture, alcohol/water separation, pollutant removal from air or water, substrate‐selective catalysis, energy storage, anticorrosion, and self‐cleaning. Herein, the recent research advancements in hydrophobic MOFs are presented. The existing techniques for qualitatively or quantitatively assessing the hydrophobicity of MOFs are first introduced. The reported experimental methods for the preparation of hydrophobic MOFs are then categorized. The concept that hydrophobic MOFs normally synthesized from predesigned organic ligands can also be prepared by the postsynthetic modification of the internal pore surface and/or external crystal surface of hydrophilic or less hydrophobic MOFs is highlighted. Finally, an overview of the recent studies on hydrophobic MOFs for various applications is provided and suggests the high versatility of this unique class of materials for practical use as either adsorbents or nanomaterials.

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“…To date, the synthetic strategies toward this aim include: i) forming mixed matrix membranes by doping pre‐synthesized MOFs; ii) forming metal–organic gels through sol–gel processes; and iii) employing 2D/3D structured supports for loading MOF particles . However, these approaches lack control over the organization of the MOFs inside the support, resulting in severe MOF aggregation, low MOF contents (usually <30 %), ill‐defined hierarchical porosity, and poor formability of the support.…”

Section: Introductionmentioning

confidence: 99%

A Spiderweb‐Like Metal–Organic Framework Multifunctional Foam

et al. 2020

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Processing metal–organic frameworks (MOFs) into hierarchical macroscopic materials can greatly extend their practical applications. However, current strategies suffer from severe aggregation of MOFs and limited tuning of the hierarchical porous network. Now, a strategy is presented that can simultaneously tune the MOF loading, composition, spatial distribution, and confinement within various bio‐originated macroscopic supports, as well as control the accessibility, robustness, and formability of the support itself. This method enables the good dispersion of individual MOF nanoparticles on a spiderweb‐like network within each macrovoid even at high loadings (up to 86 wt %), ensuring the foam pores are highly accessible for excellent adsorption and catalytic capacity. Additionally, this approach allows the direct pre‐incorporation of other functional components into the framework. This strategy provides precise control over the properties of both the hierarchical support and MOF.

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Shape Controlled Hierarchical Porous Hydrophobic/Oleophilic Metal‐Organic Nanofibrous Gel Composites for Oil Adsorption

Cited by 165 publications

References 53 publications

Ultrathin 2D Cobalt Zeolite‐Imidazole Framework Nanosheets for Electrocatalytic Oxygen Evolution

Ultrathin 2D Cobalt Zeolite‐Imidazole Framework Nanosheets for Electrocatalytic Oxygen Evolution

Hydrophobic Metal–Organic Frameworks: Assessment, Construction, and Diverse Applications

A Spiderweb‐Like Metal–Organic Framework Multifunctional Foam

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