Shell‐like Xenon Nano‐Traps within Angular Anion‐Pillared Layered Porous Materials for Boosting Xe/Kr Separation

Fang, Zheng; Guo, Lidong; Chen, Rundao; Chen, Lihang; Zhang, Zhiguo; Yang, Qiwei; Yang, Yiwen; Su, Baogen; Ren, Qilong; Bao, Zongbi

doi:10.1002/anie.202116686

Cited by 37 publications

(24 citation statements)

References 71 publications

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“…, N and O) on carbon surfaces is an important aspect that may change the xenon–krypton adsorption characteristics. In addition to N and O, the MO 4 2– pillars, hexafluoro anions, and amino groups are reported as providing polar groups for capturing the Xe atom by Z. Bao and colleagues. , To see such an effect of N doping, FAU-ZTC was chosen. The N-containing functionality was introduced using pyrrole as the carbon precursor in the FAU-ZTC synthesis .…”

Section: Resultsmentioning

confidence: 99%

Nanoporous 3D Graphene-like Zeolite-Templated Carbon for High-Affinity Separation of Xenon from Krypton

Lee

Park

Cho

et al. 2022

ACS Appl. Nano Mater.

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Nanoporous three-dimensional (3D) graphene-like carbons can be synthesized in MFI-, FAU-, and β-type zeolite templates, using the metal ion-catalyzed synthesis method. The carbon products obtained from the templates possessing distinct pore systems have large Brunauer–Emmett–Teller specific surface areas (700–3200 m2 g–1) and zeolite-like pore-structure ordering. The characteristic pore sizes of MFI-, FAU-, and β-zeolite-templated nanoporous carbons (ZTCs) were determined to be 0.5, 1.1, and 0.9 nm, respectively. The three ZTCs were studied for xenon–krypton adsorption according to the zeolite types. The MFI-ZTC exhibited the highest ideal adsorbed solution theory selectivity of 17 at an early coverage for xenon (Xe) over krypton (Kr) among the ZTCs. The β-ZTC exhibited one of the highest Xe/Kr uptake ratios and the highest Xe capacity, which originated from the high BET surface area of the 3D graphenic structure. We also demonstrate that the introduction of heteroatoms (e.g., O and N) in the same ZTC structure makes it more favorable for the separation of xenon over krypton. The gas separation performance of N-doped FAU-ZTC, as evaluated by xenon–krypton breakthrough experiments, exceeded that of activated carbon and undoped FAU-ZTC material.

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Section: Resultsmentioning

confidence: 99%

Nanoporous 3D Graphene-like Zeolite-Templated Carbon for High-Affinity Separation of Xenon from Krypton

Lee

Park

Cho

et al. 2022

ACS Appl. Nano Mater.

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“…25d). Similarly, Zheng et al reported a series of anion-pillared materials with multiple specific Xe nano-traps, 242 exhibiting an extraordinary separation performance with both high Xe uptake capacity and Xe/Kr selectivity.…”

Section: Xenon/krypton Separationmentioning

confidence: 95%

“…237–239 Based on these studies, several MOFs have recently been established for highly efficient Xe/Kr separation. 240–254…”

Section: Xenon/krypton Separationmentioning

confidence: 99%

Recent advances in microporous metal–organic frameworks as promising adsorbents for gas separation

Wang

Liang

et al. 2022

J. Mater. Chem. A

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“…Based on the light-responsive host–guest system of reversible interaction, light can not only change the inner surface properties of nanochannels ( Zhang Q. Q. et al, 2012 ) to realize the regulation of selective identification and transmission behaviors but also can achieve the specific molecular controllable release of host or guest molecules ( Angelos et al, 2009 ). At present, nanochannels were functionalized with a variety of molecular scaffolds, including macrocyclic hosts such as pillar[n]arene ( Li et al, 2022 ), cyclodextrin (CD) ( Su et al, 2022 ), and metal–organic skeleton (MOF) ( Zheng et al, 2022 ), either through covalent bonding modification or host–guest assemble methods ( Scheme 1 ). Photo-responsiveness of azobenzene, spirogyra, and retinal results from their geometrical or chemical transformation attained by them with the exposure of light; this ultimately results in complexation and decomplexation of the host–guest leading to changes in the hydrophobicity of nanochannels.…”

Section: Introductionmentioning

confidence: 99%

Light-responsive nanochannels based on the supramolecular host–guest system

Quan

Guo

et al. 2022

Front. Chem.

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The light-responsive nanochannel of rhodopsin gained wider research interest from its crucial roles in light-induced biological functions, such as visual signal transduction and energy conversion, though its poor stability and susceptibility to inactivation in vitro have limited its exploration. However, the fabrication of artificial nanochannels with the properties of physical stability, controllable structure, and easy functional modification becomes a biomimetic system to study the stimulus-responsive gating properties. Typically, light-responsive molecules of azobenzene (Azo), retinal, and spiropyran were introduced into nanochannels as photo-switches, which can change the inner surface wettability of nanochannels under the influence of light; this ultimately results in the photoresponsive nature of biomimetic nanochannels. Furthermore, the fine-tuning of their stimulus-responsive properties can be achieved through the introduction of host–guest systems generally combined with a non-covalent bond, and the assembling process is reversible. These host–guest systems have been introduced into the nanochannels to form different functions. Based on the host–guest system of light-responsive reversible interaction, it can not only change the internal surface properties of the nanochannel and control the recognition and transmission behaviors but also realize the controlled release of a specific host or guest molecules in the nanochannel. At present, macrocyclic host molecules have been introduced into nanochannels including pillararenes, cyclodextrin (CD), and metal–organic frameworks (MOFs). They are introduced into the nanochannel through chemical modification or host–guest assemble methods. Based on the changes in the light-responsive structure of azobenzene, spiropyran, retinal, and others with macrocycle host molecules, the surface charge and hydrophilic and hydrophobic properties of the nanochannel were changed to regulate the ionic and molecular transport. In this study, the development of photoresponsive host and guest-assembled nanochannel systems from design to application is reviewed, and the research prospects and problems of this photo-responsive nanochannel membrane are presented.

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Shell‐like Xenon Nano‐Traps within Angular Anion‐Pillared Layered Porous Materials for Boosting Xe/Kr Separation

Cited by 37 publications

References 71 publications

Nanoporous 3D Graphene-like Zeolite-Templated Carbon for High-Affinity Separation of Xenon from Krypton

Nanoporous 3D Graphene-like Zeolite-Templated Carbon for High-Affinity Separation of Xenon from Krypton

Recent advances in microporous metal–organic frameworks as promising adsorbents for gas separation

Light-responsive nanochannels based on the supramolecular host–guest system

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