Flexible metal–organic frameworks for gas storage and separation

Dalton Transactions, Journal Year: 2022, Volume and Issue: 51(12), P. 4608 - 4618

Published: Jan. 1, 2022

Flexible metal-organic frameworks (MOFs) have gradually attracted much attention due to their reversible structural changes and flexible responses. The basic research of MOFs is study dynamic responses under different external stimuli translate the into applications. Most studies on focus gas storage separation, but lack a systematic summary. Here, we review development MOFs, transformation effects temperature, pressure, guest molecules, applications in separation. Microporous with structures provide unique opportunities for fine-tuning performance because pore shape size can be controlled by stimuli. characteristics breathing phenomena large specific surface area make suitable candidates Finally, application prospects are reported.

Language: Английский

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Photo‐Stimuli‐Responsive Dual‐Emitting Luminescence of a Spiropyran‐Encapsulating Metal–Organic Framework for Dynamic Information Encryption

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(26)

Published: March 9, 2023

The development of photo-stimuli-responsive luminescent materials is essential to address emerging demands in encryption security. Here, a novel dual-emitting material ZJU-128⊃SP (SP = spiropyran) reported, which obtained by encapsulating spiropyran molecules into cadmium-based metal-organic framework (MOF), [Cd3 (TCPP)2 ]·4DMF·4H2 O (ZJU-128, H4 TCPP 2,3,5,6-tetrakis (4-carboxyphenyl)pyrazine). This MOF/dye composite exhibits blue emission from the ligand ZJU-128 at 447 nm and red around 650 spiropyran. Utilizing photoisomerization ring-closed ring-open form under UV-light irradiation, significant fluorescence resonance energy transfer (FRET) process between achieved. As result, gradually decreased while increases. dynamic fluorescent behavior can fully recover original state following exposure visible light (>405 nm). By taking advantage time-dependent fluorescence, dynamical anti-counterfeiting patterns multiplexed coding are successfully developed based on film. work provides an inspiring point for design information with higher security requirements.

Language: Английский

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Aluminum metal–organic frameworks: From structures to applications

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 489, P. 215175 - 215175

Published: May 3, 2023

Language: Английский

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Challenges in Developing MOF-Based Membranes for Gas Separation

Langmuir, Journal Year: 2023, Volume and Issue: 39(8), P. 2871 - 2880

Published: Feb. 20, 2023

Metal–organic frameworks (MOFs) are promising candidates for membrane gas separation. MOF-based membranes include pure MOF and mixed matrix (MMMs). This Perspective discusses the challenges next stage of development based on research conducted in past decade. We focused three major issues associated with membranes. First, some compounds have been overstudied, despite availability numerous MOFs. Second, adsorption diffusion MOFs often independently investigated. The correlation between has seldom discussed. Third, we identify importance characterizing distribution to understand structure–property relationships For MMMs, engineering MOF–polymer interface is essential achieving desired separation performance. Various approaches modify surface or polymer molecular structure proposed improve interface. Herein, present defect as a facile efficient approach interfacial morphology its extended application various separations.

Language: Английский

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New‐Generation Anion‐Pillared Metal–Organic Frameworks with Customized Cages for Highly Efficient CO₂ Capture

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(14)

Published: Jan. 18, 2023

Abstract The rational design of porous materials for CO 2 capture under realistic process conditions is highly desirable. However, trade‐offs exist among a nanopore's capacity, selectivity, adsorption heat, and stability. In this study, new generation anion‐pillared metal‐organic frameworks (MOFs) are reported with customizable cages benchmark from flue gas. optimally designed TIFSIX‐Cu‐TPA exhibits high excellent /N thermal stability, chemical stability in acid solution acidic atmosphere, as well modest heat facile regeneration. Additionally, the practical separation performance synthesized MOFs demonstrated by breakthrough experiments various conditions. A selective achieved at 298–348 K impressive capacity 2.1–1.4 mmol g −1 . Importantly, outstanding sustained humidity over ten repeat cycles. molecular mechanism MOF's further investigated situ dosed single crystal structure theoretical calculations, highlighting two separate binding sites small large featured selectivity loading, respectively. simultaneous inside these types interconnected accounts newly anionic pillar‐caged MOFs.

Language: Английский

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Rational Construction of Ultrahigh Thermal Stable MOF for Efficient Separation of MTO Products and Natural Gas

ACS Materials Letters, Journal Year: 2023, Volume and Issue: 5(4), P. 1091 - 1099

Published: March 9, 2023

Considering the important application foundation of propylene (C3H6) and ethylene (C2H4) production, as well methane (CH4), in petrochemical industries, this report comprehensively investigated an innovative MOF material (Zn-BPZ-SA) that was synthesized by 3,3′,5,5′-tetramethyl-4,4′-bipyrazole (H2BPZ) squaric acid (H2SA) for separating methanol-to-olefins (MTO) products (C3H6/C2H4 mixtures) natural gas (C3H8/C2H6/CH4 mixtures). Zn-BPZ-SA with great resistance toward water exceptional thermal stability (520 °C), can preferentially adsorb C3H8 C3H6 rather than C2H6 C2H4, particular, reveals high uptakes 46.6 48.0 cm3 g–1 under crucial low pressure (10 kPa, 298 K). The experimental simulated transient breakthroughs C3H6/C2H4 binary mixtures C3H8/C2H6/CH4 ternary demonstrated separate these long breakthrough time differences, yielding high-purity (>99.95%) productivities: C2H4 (21.9–142.8 L kg–1) CH4 (34.9–73.0 kg–1). excellent separation abilities be attributed to rich accessbile O/N methyl binding sites scattered at pore surfaces framework.

Language: Английский

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Large‐Area Fabrication of Ultrathin Metal‐Organic Framework Membranes

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(18)

Published: Feb. 28, 2023

Metal-organic framework (MOF)-based membranes, featuring potential molecular sieving effects and therefore capable of surmounting the ubiquitous trade-off between membrane selectivity permeability, hold great promise for multitudinous chemical separations. Nevertheless, it remains highly challenging large-area fabrication ultrathin MOF membranes with variable thickness, homogeneity, preferential orientation. Herein, this work reports facile (down to 20 nm) NUS-8 in (>200 cm2 ) yet homogeneity texture along (00l) direction due superior solution processability as-synthesized nanosheets. The resultant good adhesion properties certain flexibility exhibit excellent rejections (>98% Mg2+ Al3+ , dyes weights larger than 585.5 g mol-1 toward aqueous separation various metal ions at modest permeance (1-3.2 L m-2 h-1 bar-1 well-aligned structures. Such performance outstands among polymetric thin-film composite mixed matrix other reported literature. mechanism is reasonably discussed based on experimental theoretical results. This study opens up novel perspectives preparing using MOFs.

Language: Английский

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Post-synthetic modification of metal-organic framework-based membranes for enhanced molecular separations

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 491, P. 215259 - 215259

Published: June 1, 2023

Language: Английский

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Metal–Organic Framework Coated Devices for Gas Sensing

ACS Sensors, Journal Year: 2023, Volume and Issue: 8(7), P. 2471 - 2492

Published: June 27, 2023

The demand for monitoring chemical and physical information surrounding, air quality, disease diagnosis has propelled the development of devices gas sensing that are capable translating external stimuli into detectable signals. Metal–organic frameworks (MOFs), possessing particular physiochemical properties with designability in topology, specific surface area, pore size and/or geometry, potential functionalization, host–guest interactions, reveal excellent promises manufacturing a variety MOF-coated multitudinous applications including sensing. past years have witnessed tremendous progress on preparation sensors superior performance, especially high sensitivity selectivity. Although limited reviews summarized different transduction mechanisms sensors, summarizing latest under working principles would be good complement. Herein, we summarize advances several classes MOF-based sensing, i.e., chemiresistive capacitors, field-effect transistors (FETs) or Kelvin probes (KPs), electrochemical, quartz crystal microbalance (QCM)-based sensors. chemistry structural characteristics were carefully associated behaviors relevant Finally, challenges future prospects long-term potentially practical application pointed out.

Language: Английский

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Step‐Nucleation In Situ Self‐Repair to Prepare Rollable Large‐Area Ultrathin MOF Membranes

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(48)

Published: Aug. 29, 2023

Ultrathin membranes with ultrahigh permeance and good gas selectivity have the potential to greatly decrease separation process costs, but it requires practical preparation of large area for implementation. Metal-organic frameworks (MOFs) are very attractive membrane applications. However, date, largest MOF reported in literature is only about 100 cm2 . In present study, a new step-nucleation situ self-repair strategy proposed that enables large-area (2400 ) ultrathin rollable deposited on an inexpensive flexible polymer support layer first time, combining polyvinyl alcohol (PVA)-metal-ion pure metal-ion layer. The main role act as nucleation sites growth, while PVA-metal-ion acts slow-release source, which supplements crystal repair any defects occurring. Membrane modules necessary components applications, spiral-wound among most common module formats widely applied separation. A 4800 was successfully prepared, demonstrating implementation membranes.

Language: Английский

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