Mesopore engineering of ZIF-8 by [Bmim][Tf 2 N] positioning into nanocage for enhanced CO 2 capture
Chemical Engineering Science, ISSN: 0009-2509, Vol: 280, Page: 118998
2023
- 14Citations
- 11Captures
- 1Mentions
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Most Recent News
Investigators from Dalian University of Technology Release New Data on Nanocages (Mesopore Engineering of Zif-8 By [Bmim][Tf2n] Positioning Into Nanocage for Enhanced Co2 Capture)
2023 OCT 06 (NewsRx) -- By a News Reporter-Staff News Editor at Nanotech Daily -- A new study on Nanotechnology - Nanocages is now available.
Article Description
The regulation on cage size and CO 2 -philic environment of metal–organic frameworks (MOFs) is essential to improve CO 2 capture. In this work, [Bmim][Tf 2 N] was proposed to position into cages of ZIF-8 to achieve the selective permeation of CO 2 by pore screening and CO 2 adsorption. [Bmim][Tf 2 N] was introduced into cages of ZIF-8 by “adsorption-infiltration” strategy. Due to the strong interaction between [Tf 2 N] − and ZIF-8, the cages present a CO 2 -philic environment, which preferentially attracts CO 2 to enter these cages, ensuring the dissolution selectivity of CO 2. Besides, the proper cage size tuned by [Bmim][Tf 2 N] provides CO 2 with a faster transport channel due to its smaller average kinetic diameter than N 2, guaranteeing the diffusion selectivity of CO 2. Consequently, the CO 2 separation in [Bmim][Tf 2 N]@ZIF-8/Pebax MMMs is intensified. With increasing the [Bmim][Tf 2 N] content in cages of ZIF-8, the pore volume by BET results decreases and the CO 2 adsorption from molecular simulation increases. In response, the CO 2 /N 2 selectivity of [Bmim][Tf 2 N]@ZIF-8/Pebax MMMs is enhanced constantly. Meanwhile, the CO 2 permeability is declined due to the narrowed cage size. All of these results demonstrate the significance of pore screening and CO 2 adsorption induced by [Bmim][Tf 2 N]. Specifically, [Bmim][Tf 2 N] 8 @ZIF-8/Pebax MMM at filler loading of 15 wt% exhibits the CO 2 permeability of 108.3 Barrer and the CO 2 /N 2 selectivity of 86.7, exceeding the 2008 Robeson upper bound. Especially the CO 2 /N 2 selectivity locates at a higher level than those of most reported works, indicating that appropriate tuning of the physicochemical properties within the nanocages of MOFs is significative to improve CO 2 capture.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0009250923005547; http://dx.doi.org/10.1016/j.ces.2023.118998; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85162178486&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0009250923005547; https://dx.doi.org/10.1016/j.ces.2023.118998
Elsevier BV
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