A MOF Glass Membrane for Gas Separation

Wang, Yuhan; Jiang, Hua; Ma, Qiang; Mo, Kai; Mao, Haizhuo; Feldhoff, Armin; Cao, Xingzhong; Li, Yanshuo; Pan, Fusheng; Jiang, Zhongyi

doi:10.1002/ange.201915807

Cited by 91 publications

(79 citation statements)

References 48 publications

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“…Gas adsorption experiments using N 2 or CO 2 (Supplementary Fig. 32) reveal a fourfold increase of the glass' total porosity after washing; in particular, the washed a g (IL@ZIF-8-LT) sample which contains a major fraction of crystalline ZIF-8 (being only partially amorphized) exhibited improved CO 2 uptake compared to the adsorption capacity observed for other MOF glasses such as a g ZIF-62 and a g [(ZIF-8) 0.2 (ZIF-62) 0.8 ] 56,57 . While outside of the scope of the present study, future exploration of LT-type composite materials containing crystalline ZIF-8 in a partially melted IL@ZIF-8 matrix phase may be beneficial towards the application of these materials, for example, in gas adsorption and separation.…”

Section: [Emim]mentioning

confidence: 94%

Ionic liquid facilitated melting of the metal-organic framework ZIF-8

et al. 2021

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Hybrid glasses from melt-quenched metal-organic frameworks (MOFs) have been emerging as a new class of materials, which combine the functional properties of crystalline MOFs with the processability of glasses. However, only a handful of the crystalline MOFs are meltable. Porosity and metal-linker interaction strength have both been identified as crucial parameters in the trade-off between thermal decomposition of the organic linker and, more desirably, melting. For example, the inability of the prototypical zeolitic imidazolate framework (ZIF) ZIF-8 to melt, is ascribed to the instability of the organic linker upon dissociation from the metal center. Here, we demonstrate that the incorporation of an ionic liquid (IL) into the porous interior of ZIF-8 provides a means to reduce its melting temperature to below its thermal decomposition temperature. Our structural studies show that the prevention of decomposition, and successful melting, is due to the IL interactions stabilizing the rapidly dissociating ZIF-8 linkers upon heating. This understanding may act as a general guide for extending the range of meltable MOF materials and, hence, the chemical and structural variety of MOF-derived glasses.

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Section: [Emim]mentioning

confidence: 94%

Ionic liquid facilitated melting of the metal-organic framework ZIF-8

et al. 2021

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“…3,4 For CO2 uptake at 273 K and 1 bar, ag(IL@ZIF-8-HT) and ag(IL@ZIF-8-LT) show 10 and 12 cc (STP) g -1 which is lower than 18 cc (STP) g -1 reported for agZIF-62. 5 However, the washed ag(IL@ZIF-8-HT)-PW and ag(IL@ZIF-8-LT)-PW samples (with 24 and 29 cc (STP) g -1 , respectively) again outperform data reported for agZIF-62 and ag[(ZIF-8)0.2(ZIF-62)0.8] (18.7 cc (STP) g -1 ) at similar temperature and pressure. Gas uptake / cc (STP) g -1…”

Section: Reviewer #2 (Remarks To the Author)mentioning

confidence: 49%

“…Gas adsorption experiments using N2 or CO2 (Supplementary Figure S32) reveal a 4-fold increase of the glass' total porosity after washing; in particular, the washed ag(IL@ZIF-8-LT) sample which contains a major fraction of crystalline ZIF-8 (being only partially amorphized) exhibited improved CO2 uptake compared to the adsorption capacity observed for other MOF glasses such as agZIF-62 and ag[(ZIF-8)0.2(ZIF-62)0.8]. 3,5 While outside of the scope of the present study, future exploration of LT-type composite materials containing crystalline ZIF-8 in a partially melted IL@ZIF-8 matrix phase may be beneficial towards application of these materials, for example, in gas adsorption and separation.'' BET analysis in the Methods section is also updated and highlighted in yellow.…”

Section: Reviewer #2 (Remarks To the Author)mentioning

confidence: 95%

“…Nonetheless, we investigated the optical, mechanical, and microstructural properties of the ag(IL@ZIF-8-HT) glass in order to provide incentives towards potential applications. 5,11 The following experimental details are included in Supplementary Information on page 4 and highlighted in yellow:…”

Section: Comment 4-"it Offers Exciting Opportunities To Melt Other Non-meltable Crystalline Mofsmentioning

confidence: 99%

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Ionic Liquid Facilitated Melting of the Metal-Organic Framework ZIF-8

Nozari¹,

Calahoo²,

Tuffnell³

et al. 2021

Preprint

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<div>Hybrid glasses from melt-quenched metal-organic frameworks (MOFs) have been emerging as a new class of materials, which combine the functional properties of crystalline MOFs with the processability of glasses. However, only a handful of the vast variety of crystalline MOFs have been identified as being meltable. Porosity and metal-linker interaction strength have both been identified as crucial parameters in the trade-off between thermal decomposition of the organic linker and, more desirably, melting. For example, the inability of the prototypical zeolitic imidazolate framework (ZIF) ZIF-8 to melt, is ascribed to the instability of the organic linker upon dissociation from the metal center. Here, we demonstrate that the incorporation of an ionic liquid (IL) into the porous interior of ZIF-8 provides a means to reduce its melting temperature to below its thermal decomposition temperature (Tm < Td). Experimental evidence shows that the Tm of ZIF-8 obtained by IL infiltration is around 381 °C, and that the glass forming ability (Tg/Tm) of such melts is above 0.9, i.e. higher than those previously reported for other meltable MOFs. Our structural studies show that the prevention of decomposition, and successful melting, is due to the IL interactions stabilizing the rapidly dissociating ZIF-8 linkers upon heating. This understanding may act as a general guide for extending the range of meltable MOF materials and, hence, the chemical and structural variety of MOF-derived glasses.</div>

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“…Very recently,an ovel ZIF-62 MOF glass membrane was born for CO 2 separation, and the uplifting performance greatly advancedthe study of amorphous MOFs for gas separation. [10] ZIF-8, one of the most representativeM OF,c omposes of zinc tetrahedral bridged 2-methylimidazolate (Hmim). [11] ZIF-8 is well-known as the membrane materialf or highly efficient gas separation due to its molecular-sieving characteristics.…”

mentioning

confidence: 99%