Issue 63, 2019, Issue in Progress

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

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

Supplementary files

Article information

Article type
Paper
Submitted
09 Oct 2019
Accepted
05 Nov 2019
First published
12 Nov 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 36808-36814

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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