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

Lee, Wang Geun; Yoon, Tae Ung; Bae, Yang‐Seop; Kim, Kwang S.; Baek, Seung Bin

doi:10.1039/c9ra08184d

Cited by 31 publications

(22 citation statements)

References 61 publications

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“…100 Lee et al reported that HOF-BTB can be used for Xe/Kr separation. 89 At 295 K and 1 bar, HOF-BTB exhibits high Xe uptake of 2.01 mmol g −1 but lower Kr uptake of 0.416 mmol g −1 , resulting in a high IAST selectivity of 6.1. The Q st value of Xe at zero limits surface coverage is 18.7 kJ mol −1 , larger than that of Kr (14.3 kJ mol −1 ), indicating the stronger binding of Xe than Kr in HOF-BTB.…”

Section: Construction Of Porous Hofsmentioning

confidence: 96%

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Hydrogen-Bonded Organic Frameworks as a Tunable Platform for Functional Materials

et al. 2020

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As a novel class of porous crystalline materials, hydrogen-bonded organic frameworks (HOFs), self-assembled from organic or metal−organic building blocks through intermolecular hydrogen-bonding interactions, have attracted more and more attention. Over the past decade, a number of porous HOFs have been constructed through judicious selection of H-bonding motifs, which are further enforced by other weak intermolecular interactions such as π−π stacking and van der Waals forces and framework interpenetration. Since the H-bonds are weaker than coordinate and covalent bonds used for the construction of metal−organic frameworks (MOFs) and covalent organic frameworks (COFs), HOFs have some unique features such as mild synthesis condition, solution processability, easy healing, and regeneration. These features enable HOFs to be a tunable platform for the construction of functional materials. Here, we review the H-bonding motifs used for constructing porous HOFs and highlight some of their applications, including gas separation and storage, chiral separation and structure determination, fluorescent sensing, heterogeneous catalysis, biological applications, proton conduction, photoluminescent materials, and membrane-based applications.

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Section: Construction Of Porous Hofsmentioning

confidence: 96%

“…Adsorptive separation of a Xe/Kr mixture is considered as an energy-effective approach . Lee et al reported that HOF-BTB can be used for Xe/Kr separation . At 295 K and 1 bar, HOF-BTB exhibits high Xe uptake of 2.01 mmol g –1 but lower Kr uptake of 0.416 mmol g –1 , resulting in a high IAST selectivity of 6.1.…”

Section: Gas Separation and Storagementioning

confidence: 99%

Hydrogen-Bonded Organic Frameworks as a Tunable Platform for Functional Materials

et al. 2020

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“…As shown in Fig. 2b, the Xe uptake of SMOF-PFSIX-1 and SMOF-AsFSIX-1 under 1.0 bar was comparable to HOF-BTB (2.0) and some MOFs with OMSs such as Co 3 (HCOO) 6 (2.2) 29,30 , and surpassed some reported materials including CROFOUR-1-Ni (1.8), CROFOUR-2-Ni (1.6), and SBMOF-1 (1.4) 16,31 . The Xe adsorption curves exhibited a steep increase in comparison with the straight Kr adsorption isotherms, indicating the different interactions between frameworks and guest molecules with different polarities as well as the potential Xe/Kr separation selectivity.…”

Section: Gas Adsorption Analysismentioning

confidence: 65%

“…As Fig. 2b concludes, the Xe/Kr selectivity is higher than that of Ni-MOF-74 (5-6) and HOF-BTB (6) 30,18 , but lower than the majority MOFs 21,16,17 . Furthermore, Henry's Constant was calculated to reflect their separation performance under low concentrations (Fitting parameters of Langmuir model can be seen in Table S6, see the Supporting Information), and the results are 4.1 and 5.1 for SMOF-PFSIX-1a and SMOF-AsFSIX-1a respectively.…”

Section: Isosteric Heats Of Adsorption and Separation Selectivitymentioning

confidence: 72%

Porous Hydrogen-Bonded Frameworks Assembled from Metal-Nucleobase Entities for Xe/Kr Separation

et al. 2022

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It is challenging to obtain high-purity xenon (Xe) and krypton (Kr) from the by-products of the air separation process due to their similar atom size and physical properties. Adsorption using porous materials such as metalorganic frameworks has been considered a promising technology to separate Xe/Kr. Herein, we reported two novel isostructural ionic supramolecular metal-organic frameworks (SMOFs, SMOF-PFSIX-1, and SMOF-AsFSIX-1), in which inorganic anions (PF 6or AsF 6-) and cationic metal-organic entities self-assembled through hydrogen bonds to give three-dimension pore channels. The two kinds of SMOFs can separate Xe/Kr efficiently with IAST selectivity of 6.9 and 6.7 under 298 K and 1.0 bar respectively. The breakthrough experiments further confirmed their industrial application potential. The Grand Canonical Monte Carlo (GCMC) and the Density Functional Theory (DFT) calculations revealed that there were multiple adsorptive sites to catch the Xe atom, and the affinity between Xe and frameworks can be attributed to the inorganic anions and amino groups on the ligands. To the best of our knowledge, it was the first time to report the SMOFs for Xe/Kr separation, and we proposed a new strategy for Xe/Kr separation based on the synergistic effect of amino and inorganic anions.

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“…Nowadays, HOFs have several applications: for example, in gas separation and storage [43,44,[56][57][58][59][60][61][62][63][64], heterogeneous catalysis [65][66][67], biomedicine [68,69], and proton conduction [70][71][72][73][74]. In addition, they have been proposed for photonic applications [54] such as sensing [75][76][77][78][79][80][81][82][83], photocatalysis [84,85], biomedicine [86], and optoelectronics [87].…”

Section: Introductionmentioning

confidence: 99%

HOFs Built from Hexatopic Carboxylic Acids: Structure, Porosity, Stability, and Photophysics

Nunzio

Suzuki

Hisaki

et al. 2022

IJMS

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Hydrogen-bonded organic frameworks (HOFs) have attracted renewed attention as another type of promising candidates for functional porous materials. In most cases of HOF preparation, the applied molecular design principle is based on molecules with rigid π-conjugated skeleton together with more than three H-bonding groups to achieve 2D- or 3D-networked structures. However, the design principle does not always work, but results in formation of unexpected structures, where subtle structural factors of which we are not aware dictate the entire structure of HOFs. In this contribution, we assess recent advances in HOFs, focusing on those composed of hexatopic building block molecules, which can provide robust frameworks with a wide range of topologies and properties. The HOFs described in this work are classified into three types, depending on their H-bonded structural motifs. Here in, we focus on: (1) the chemical aspects that govern their unique fundamental chemistry and structures; and (2) their photophysics at the ensemble and single-crystal levels. The work addresses and discusses how these aspects affect and orient their photonic applicability. We trust that this contribution will provide a deep awareness and will help scientists to build up a systematic series of porous materials with the aim to control both their structural and photodynamical assets.

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

Abstract: A highly robust microporous hydrogen-bonded organic framework selectively separates Xe from Kr, as well as efficiently adsorbs water vapor.

Cited by 31 publications

References 61 publications

Hydrogen-Bonded Organic Frameworks as a Tunable Platform for Functional Materials

Hydrogen-Bonded Organic Frameworks as a Tunable Platform for Functional Materials

Porous Hydrogen-Bonded Frameworks Assembled from Metal-Nucleobase Entities for Xe/Kr Separation

HOFs Built from Hexatopic Carboxylic Acids: Structure, Porosity, Stability, and Photophysics

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