Rapid microwave-assisted synthesis of hybrid zeolitic–imidazolate frameworks with mixed metals and mixed linkers

Hillman, Febrian; Zimmerman, John; Paek, Seung‐Min; Hamid, Mohamad Rezi Abdul; Lim, Woo Taik; Jeong, Hae‐Kwon

doi:10.1039/c6ta11170j

Cited by 172 publications

(121 citation statements)

References 62 publications

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“…Zeolitic imidazolate framework-8 (ZIF-8), with sodalite (SOD) topology constructed from Zn and Hmim, is one of the most investigated ZIF materials 13–15 . Nowadays, ZIF-8 can be synthesized using a variety of methods including solvothermal method 1 , aqueous synthesis at room temperature 16 , microwave-assisted method 17,18 , vapor-assisted conversion method 19 , ultrasonic synthesis 20 , electrochemical routines 21 , mechanochemical synthesis 22 and reverse microemulsion method 23 . Aqueous synthesis at room temperature has been widely employed owing to its simplicity, short times and energy saving.…”

Section: Introductionmentioning

confidence: 99%

Influence of the 2-methylimidazole/zinc nitrate hexahydrate molar ratio on the synthesis of zeolitic imidazolate framework-8 crystals at room temperature

Zhang

Jia

et al. 2018

Sci Rep

115

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The effect of the 2-methylimidazole (Hmim)/zinc nitrate hexahydrate (Zn) molar ratio on the physicochemical characteristics of the zeolitic imidazolate framework-8 (ZIF-8) was investigated. ZIF-8 crystals were synthesized by mixing Hmim with Zn at room temperature without any additives in methanol solution. It was found that Hmim/Zn molar ratio had significant influence on the crystallinity, yield, particle size and porosity of ZIF-8. The samples synthesized at low Hmim/Zn molar ratio showed a cubic shape, whereas at higher Hmim/Zn ratios truncated rhombic dodecahedron or rhombic dodecahedron morphologies were obtained. The particle size is decreased upon increasing the Hmim/Zn molar ratio. Besides, higher Hmim/Zn molar ratio in a certain range resulted in improving crystallinity, yield, surface area and micropore volume of ZIF-8. The ZIF-8 crystals produced at Hmim/Zn molar ratio of 8 exhibited the best characteristics. The present work provides new insights in relation to the role of Hmim/Zn molar ratio on the synthesis process of ZIF-8.

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Section: Introductionmentioning

confidence: 99%

Influence of the 2-methylimidazole/zinc nitrate hexahydrate molar ratio on the synthesis of zeolitic imidazolate framework-8 crystals at room temperature

Zhang

Jia

et al. 2018

Sci Rep

115

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“…[5,29] Apart from the previous works, here the size distribution of uniform ZIF-8 seeds was successfully tuned between 50-130 nm without using any capping agents. [30] Lattice parameters for ZIF-8 particles were calculated to be a = b = c = 16.5306 Å, while that of ZIF-67 on ZIF-8 was calculated to be a = b = c = 16.6534 Å which is in between that of ZIF 8 and ZIF-67. Rhombic dodecahedron shapes of the ZIF particles were also further observed in the TEM images ( Figure 2c).…”

Section: Resultsmentioning

confidence: 96%

Bimetal/Metal Oxide Encapsulated in Graphitic Nitrogen Doped Mesoporous Carbon Networks for Enhanced Oxygen Electrocatalysis

2019

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In this study, Fe doped, Co and CoO encapsulated N doped carbon frameworks were prepared from simple hybrid zeolite imidazole frameworks (ZIF) with extra N enrichment. The facile strategy included preparation of ZIF-8 core and ZIF-67 shell and later replacing the metal centers of ZIF with Fe ions and increasing the N content with N rich melamine. The metal and metal oxide components got captured and encapsulated in the N doped mesoporous carbon frameworks through a pyrolysis process at different temperatures. Fe, Co and CoO were trapped in the N doped mesoporous carbon networks through annealing and denoted as FCNCx. The activity and electrochemical stability of such prepared materials towards ORR and OER were tested in basic media. After analyzing rotating disk electrode studies, FCNC900 was seen to perform superior bifunctional electrocatalytic performance for both ORR and OER which was higher than Pt/C catalyst. Promising ORR performance of FCNC900 can be simply be judged from E 1/2 = 0.868 V (vs. RHE) and E onset = 1.01 V (vs. RHE) while OER overpotential for same catalyst was 360 mV much smaller than others. Longer stability and high methanol tolerance of this catalyst was also investigated.

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“…Compared with the ν Zn-N in ZIF-8 membrane, the ν Co-N in ZIF-67 shows a clear blue shift, which is in good agreement with the previously reported characterization results. [21,30,33] The corresponding adsorption band in the spectra of all the synthesized membrane samples appears between the ZnÀ N (418 cm À 1 ) and CoÀ N (423 cm À 1 ), indicating the coordination of both Co 2 + and Zn 2 + with organic linkers in ZIF framework. To further confirm the incorporation of both Co and Zn ions in the same framework of CoZn-ZIF-8, energy dispersive X-ray spectroscopy (EDS) was carried out to analyze the Zn/Co molar ratio in the prepared mixed metal ZIF membranes ( Figure S3).…”

Section: Full Papermentioning

confidence: 94%

“…[29] Besides, various other methodologies have been developed for the synthesis of single metal MOF membrane. [30][31][32][33][34][35][36] However, most of these synthesis methods are [ not easy to be utilized in the fabrication of mixed metal MOF membrane, owing to the different coordination rate of metal ions with the organic ligand in a specific reaction zone, as well as diffusion rate of metal ions in mother solution. As far as we know, only a few reports realized the preparation of mixed metal MOF membrane, for example, Pan research group successfully fabricated zinc-substituted ZIF-67 membranes through the conventional secondary growth method.…”

Section: Introductionmentioning

confidence: 99%

Controlling Metal Ion Counter Diffusion in Confined Spaces for In Situ Growth of Mixed Metal MOF Membranes for Gas Separation

et al. 2019

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The development of facile, versatile strategies for the fabrication of mixed component metal‐organic framework (MOF) membranes is highly desired, but still very challenging due to the difficulty in controlling crystal growth rates of every single component in a specific confined space. It is difficult to adjust the formation of multicomponent MOF membrane in a controlled manner using conventional approaches such as secondary growth methods. Herein, we present a facile strategy that prepares the mixed metal zeolitic imidazolate framework (ZIF) membranes in situ in a confined space with nanostructure arrays under hydrothermal conditions using the counter diffusion mechanism. The counter diffusion of different metal ions from both the homogeneous bulk solution and the solid metal oxide nanostructure grown on substrate leads to the specific effective reaction zone by encountering with linker molecules at the interface. Subsequently, nucleation and crystal growth generate the continuous mixed metal MOF membranes. With this approach, a variety of mixed metal ZIF membranes were synthesized on different kinds of substrates. The prepared membranes exhibited good sieving effect to H2 and heavier gas molecules during both single and mixed gas permeation tests. This work opens a fresh avenue for the synthesis of mixed component MOF membranes, and the counter diffusion effect can be intentionally adopted to the design and fabrication of selective mixed metal MOF membrane on various supports.

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Rapid microwave-assisted synthesis of hybrid zeolitic–imidazolate frameworks with mixed metals and mixed linkers

Abstract: Herein we report a new microwave-assisted synthetic strategy to rapidly prepare hybrid zeolitic–imidazolate frameworks (ZIFs): ZIFs with mixed metal centers and/or mixed linkers.

Cited by 172 publications

References 62 publications

Influence of the 2-methylimidazole/zinc nitrate hexahydrate molar ratio on the synthesis of zeolitic imidazolate framework-8 crystals at room temperature

Influence of the 2-methylimidazole/zinc nitrate hexahydrate molar ratio on the synthesis of zeolitic imidazolate framework-8 crystals at room temperature

Bimetal/Metal Oxide Encapsulated in Graphitic Nitrogen Doped Mesoporous Carbon Networks for Enhanced Oxygen Electrocatalysis

Controlling Metal Ion Counter Diffusion in Confined Spaces for In Situ Growth of Mixed Metal MOF Membranes for Gas Separation

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