Porous Liquid: A Stable ZIF‑8 Colloid in Ionic Liquid with Permanent Porosity

Porous Liquid: A Stable ZIF‑8 Colloid in Ionic Liquid with Permanent Porosity

We reported an example of metal–organic framework (MOF)-based porous liquid by dispersing ZIF-8 ({Zn­(mim)2}, mim = 2-methylimidazole) nanocrystallites in ionic liquid (IL) of [Bpy]­[NTf2] (N-butyl pyridinium bis­(trifluoromethyl sulfonyl)­imide). Two essential challenges, stable colloid formation a...

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Veröffentlicht in:Langmuir 2018-03, Vol.34 (12), p.3654-3660
Hauptverfasser: Liu, Shengjun, Liu, Jiandang, Hou, Xudong, Xu, Tingting, Tong, Jing, Zhang, Junxiang, Ye, Bangjiao, Liu, Bo
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container_end_page 3660
container_issue 12
container_start_page 3654
container_title Langmuir
container_volume 34
creator Liu, Shengjun
Liu, Jiandang
Hou, Xudong
Xu, Tingting
Tong, Jing
Zhang, Junxiang
Ye, Bangjiao
Liu, Bo
description We reported an example of metal–organic framework (MOF)-based porous liquid by dispersing ZIF-8 ({Zn­(mim)2}, mim = 2-methylimidazole) nanocrystallites in ionic liquid (IL) of [Bpy]­[NTf2] (N-butyl pyridinium bis­(trifluoromethyl sulfonyl)­imide). Two essential challenges, stable colloid formation and porosity retention, have been overcome to prepare MOF-based porous liquid. Preventing ZIF-8 nanocrystals from aggregation before dispersing is vital to form a stable ZIF-8 colloid in IL via enhancing the interaction between ZIF-8 and IL. The resultant ZIF-8–[Bpy]­[NTf2] colloid is able to be stable over months without precipitating. [Bpy]­[NTf2] with larger ion sizes cannot occupy pores in ZIF-8, leaving the ZIF-8 cage empty for enabling access by guest molecules. The porosity of this porous liquid system was verified by positron (e+) annihilation lifetime spectroscopy and I2 adsorption in ZIF-8 in the colloid. MOF-based porous liquids could provide a new material platform for liquid-bed-based gas separations.
doi_str_mv 10.1021/acs.langmuir.7b04212
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Two essential challenges, stable colloid formation and porosity retention, have been overcome to prepare MOF-based porous liquid. Preventing ZIF-8 nanocrystals from aggregation before dispersing is vital to form a stable ZIF-8 colloid in IL via enhancing the interaction between ZIF-8 and IL. The resultant ZIF-8–[Bpy]­[NTf2] colloid is able to be stable over months without precipitating. [Bpy]­[NTf2] with larger ion sizes cannot occupy pores in ZIF-8, leaving the ZIF-8 cage empty for enabling access by guest molecules. The porosity of this porous liquid system was verified by positron (e+) annihilation lifetime spectroscopy and I2 adsorption in ZIF-8 in the colloid. 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title Porous Liquid: A Stable ZIF‑8 Colloid in Ionic Liquid with Permanent Porosity
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