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Issue 63, 2019, Issue in Progress
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Selective separation of Xe/Kr and adsorption of water in a microporous hydrogen-bonded organic framework

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Abstract

We have studied the adsorption properties of Xe and Kr in a highly microporous hydrogen-bonded organic framework based on 1,3,5-tris(4-carboxyphenyl)benzene, named HOF-BTB. HOF-BTB can reversibly adsorb both noble gases, and it shows a higher affinity for Xe than Kr. At 1 bar, the adsorption amounts of Xe were 3.37 mmol g−1 and 2.01 mmol g−1 at 273 K and 295 K, respectively. Ideal adsorbed solution theory (IAST) calculation predicts selective separation of Xe over Kr from an equimolar binary Xe/Kr mixture, and breakthrough experiments demonstrate the efficient separation of Xe from the Xe/Kr mixture under a dynamic flow condition. Consecutive breakthrough experiments with simple regeneration treatment at 298 K reveal that HOF-BTB would be an energy-saving adsorbent in an adsorptive separation process, which could be attributed to the relatively low isosteric heat (Qst) of adsorption of Xe. The activated HOF-BTB is very stable in both water and aqueous acidic solutions for more than one month, and it also shows a well-preserved crystallinity and porosity upon water/acid treatment. Besides, HOF-BTB adsorbs about 30.5 wt%, the highest value for HOF materials, of water vapor during the adsorption–desorption cycles, with a 19% decrease in adsorption amounts of water vapor after five cycles.

Graphical abstract: Selective separation of Xe/Kr and adsorption of water in a microporous hydrogen-bonded organic framework

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Supplementary files

Article information


Submitted
09 Oct 2019
Accepted
05 Nov 2019
First published
12 Nov 2019

This article is Open Access

RSC Adv., 2019,9, 36808-36814
Article type
Paper

Selective separation of Xe/Kr and adsorption of water in a microporous hydrogen-bonded organic framework

W. Lee, T. Yoon, Y. Bae, K. S. Kim and S. B. Baek, RSC Adv., 2019, 9, 36808
DOI: 10.1039/C9RA08184D

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