Heating and separation using nanomagnet-functionalized metal–organic frameworks

Lohe, Martin R.; Gedrich, Kristina; Freudenberg, Thomas; Kockrick, Emanuel; Dellmann, Til; Kaskel, Stefan

doi:10.1039/c0cc05278g

Cited by 140 publications

(131 citation statements)

References 30 publications

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“…For example, Fe(OH)(bdc) exists as two polymorphs, a monoclinic phase (Fe-MIL-53) and a hexagonal 95 phase (Fe-MIL-88B) which differ in how the octahedral FeO 6 building units are arranged. Preparation of a mother solution of these components yields two products: monoclinic Fe-MIL-53 as a result of homogeneous nucleation during solution aging, and Fe-MIL-88B deposited on a carboxylate-terminated SAM An alternative gel-layer strategy has recently been reported by Schoedel et al, which allows higher concentrations of reactants to 10 be employed and removes the need to precondition reaction solutions.…”

Section: Mofs At Metal/sam Interfacesmentioning

confidence: 99%

“…15) The membrane was also successfully tested in liquid separation: pervaporation studies of 90 ethyl acetate azeotropes demonstrated the water concentration of the permeate could be enhanced from 7 to 99%. This is one of the few examples of liquid separation using MOF-oxide composite membranes, and the selectivity likely arises from the favourable entry of water into the MIL-53 pores which are lined by the 95 terminal hydroxyl groups of the framework SBU. HKUST-1 membranes have also been prepared from a preoxidised copper net as the porous support.…”

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confidence: 99%

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Metal–organic framework growth at functional interfaces: thin films and composites for diverse applications

2012

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5Porous metal-organic frameworks (MOFs) are highly ordered crystalline materials prepared by the selfassembly of metal ions with organic linkers to yield low density network structures of diverse topology. MOFs have attracted considerable attention over the last decade due to their facile preparation, tunable pore metrics and the ease of functionalisation of their internal surfaces, such that designer frameworks with exceptional properties for application in gas-storage, separation of small molecules, heterogeneous 10 catalysis and drug delivery are becoming commonplace. For any material to find practical utility however there is a need for processing and formulation into application-specific configurations. One way to do this is to prepare composite materials where the MOF is supported on a planar substrate or some other shaped body through interaction with functional groups at the support interface. This is a rapidly developing research area, and this review provides an overview of the diverse MOF composite materials prepared up 15 to now, organised by interface type. The importance of the interface is explored within each section and while the overall emphasis is on applications of the composites, coatings and MOF-based devices, the most widely-used and successful synthetic strategies for composite formation are also presented. (183 references)

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Section: Mofs At Metal/sam Interfacesmentioning

confidence: 99%

mentioning

confidence: 99%

Metal–organic framework growth at functional interfaces: thin films and composites for diverse applications

2012

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“…This strategy has been widely used in developing zeolite-based photocatalysts 20 and recently in preparing MOF/nanocomposite or MOF/molecular catalyst hybrids, 19,21,22 yet suffers from challenges, notably the difficulty in preventing the guest material aggregation and the lack of the control over spatial distribution and homogeneity. 21,[23][24][25][26] An alternative approach, which has recently been used in developing photoactive MOFs, is to develop the framework which exhibits an intrinsic photochemical response and thereby can be directly applied in photocatalysis. 27,28 As photocatalysis is based on a charge-transfer (CT) event following photoexcitation, it is essential to gain an intimate knowledge of the excited-state and charge transport properties within the ZIF framework, the properties that remain unexplored.…”

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confidence: 99%

Exceptionally Long-Lived Charge Separated State in Zeolitic Imidazolate Framework: Implication for Photocatalytic Applications

et al. 2016

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Zeolitic imidazolate frameworks (ZIFs) have emerged as a novel class of porous metal-organic frameworks (MOFs) for catalysis application because of their exceptional thermal and chemical stability. Inspired by the broad absorption of ZIF-67 in UV-vis-near IR region, we explored its excited state and charge separation dynamics, properties essential for photocatalytic applications, using optical (OTA) and X-ray transient absorption (XTA) spectroscopy. OTA results show that an exceptionally long-lived excited state is formed after photoexcitation. This long-lived excited state was confirmed to be the charge-separated (CS) state with ligand-to-metal charge-transfer NOT THE PUBLISHED VERSION; this is the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation at the bottom of the page. Society, Vol 138, No. 26 (2016): pg. 8072-8075. DOI. This article is © American Chemical Society and permission has been granted for this version to appear in e-Publications@Marquette. American Chemical Society does not grant permission for this article to be further copied/distributed or hosted elsewhere without the express permission from American Chemical Society. Journal of the American Chemical3 character using XTA. The surprisingly long-lived CS state, together with its intrinsic hybrid nature, all point to its potential application in heterogeneous photocatalysis and energy conversion.Zeolitic imidazolate frameworks (ZIFs) represent an emerging subclass of metal organic frameworks (MOFs) constructed from tetrahedral coordinated transition-metal cations (M) bridged by imidazole-based ligands (lm).1,2 Because the M-lm-M angle in ZIF (∼145°) is similar to Si-O-Si angle in conventional silicon-based zeolites, ZIFs give rise to zeolite-type topology. Unlike zeolite, ZIFs are unique in structural flexibility including tunable framework, pore aperture, and surface area.1,2 Indeed, over 150 ZIF structures have, to date, been synthesized, many of which are microporous with inherently large surface areas and tunable cavities, and exhibit exceptional thermal and chemical stability.3-6 Thus, ZIFs demonstrate great promise in various applications such as gas separation and storage, 6-11 chemical sensing, 12 and heterogeneous catalysis. 13-17Driven by the increasing global energy demand, recent development in the field has extended the application of ZIF materials toward photocatalysis using visible light. Although still in the early stage of exploration, ZIFs have been used as photocatalysts for dye and phenol degradation as well as CO2 reduction. 15,[17][18][19] In these systems, photoactive nanostructures/molecules are incorporated into the highly porous structure of ZIFs, where ZIFs are used as a simple host or passive medium for dispersing the catalytic active species. This strategy has been widely used in developing zeolite-based photocatalysts 20 and recently in preparing MOF/nanocomposite or MOF/molecular catalyst hybrids, 19,21,22 yet suffers from challenges, notab...

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“…Several materials such as polyoxometalate (POM), 21,[23][24][25][26] iron oxide [27][28][29] and graphite oxide (GO) [16][17][18][19][20] have been used for the formation of MOF composites. POM/MOF composites have been used in various fields including acid catalyses, oxidation catalyses, adsorption/decontamination and so on.…”

Section: -12mentioning

confidence: 99%

Preparation of a Composite of Sulfated Zirconia/Metal Organic Framework and its Application in Esterification Reaction

Park¹,

Ḥasan²,

Ahmed³

et al. 2014

Bulletin of the Korean Chemical Society

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A porous metal-organic framework (MOF), MIL-101, was synthesized in the presence of sulfated zirconia (SZ) to produce acidic SZ/MIL-101 composites for the first time. The composites were characterized with XRD, nitrogen adsorption, FT-IR, scanning electron microscope, chemical analysis and so on. The composites (SZ/ MIL-101s) were successfully applied in a liquid-phase esterification for a high yield of ester. This catalytic result of SZ/MIL-101, compared with that of pure SZ or MIL-101 (showing a negligible yield of ester), suggests that the SZ in the composite is highly active in the acid catalysis probably because of the welldispersed active species of SZ. Moreover, the esterification is catalyzed in heterogeneous mode as confirmed by negligible esterification after filtration of the catalyst. Finally, microwaves can be efficiently applied both in the synthesis of the composites and the esterification reaction to accelerate the two processes of synthesis and esterification by about 5 times.

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Heating and separation using nanomagnet-functionalized metal–organic frameworks

Cited by 140 publications

References 30 publications

Metal–organic framework growth at functional interfaces: thin films and composites for diverse applications

Metal–organic framework growth at functional interfaces: thin films and composites for diverse applications

Exceptionally Long-Lived Charge Separated State in Zeolitic Imidazolate Framework: Implication for Photocatalytic Applications

Preparation of a Composite of Sulfated Zirconia/Metal Organic Framework and its Application in Esterification Reaction

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