Light-Gating Crystalline Porous Covalent Organic Frameworks

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(15), P. 10953 - 10962

Published: April 2, 2024

We report light gating in synthetic one-dimensional nanochannels of stable crystalline porous covalent organic frameworks. The frameworks consist 2D hexagonal skeletons that are extended over the

Language: Английский

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Chemically Stable and Heteroatom Containing Porous Organic Polymers for Efficient Iodine Vapor Capture and its Storage

ACS Applied Polymer Materials, Journal Year: 2023, Volume and Issue: 5(7), P. 5349 - 5359

Published: June 19, 2023

The uses of nuclear reactions are gaining importance in energy and medical therapy applications. Production safe management radioactive waste is a major operational challenge. Proper treatment storage important while considering for various While reprocessing used fuel (UNF), handling volatile wastes (e.g., radioisotopes iodine: 129I/131I) requires special attention. Iodine present off-gas streams as either molecular iodine (I2) or organic iodides. 129I less than 131I, but has an extremely long half-life. Both highly toxic, their nearly quantitative retention from packing filters with efficient adsorbents. Thus, there need to develop materials vapor capture/storage capabilities. Herein, set four porous polymers presented that rich heteroatoms possess abundant π-arene motifs which p-orbitals on can interact effectively via charge-transfer complexations. To mimic the conditions UNF facility, gas-phase capture experiments were performed under (dry/humid at 75 °C/25 °C). maximum uptake capacity one (HPOP-4: 6.25 g/g °C 4.35 25 °C) higher several other adsorbents reported date. trapped by HPOPs also quite remarkable only 2–3% weight loss iodine-loaded HPOPs, makes potential material storage/transportation captured radioiodine. results confirm desirable properties such facile synthesis, high physiochemical stabilities, good moisture tolerance, rapid adsorption kinetics, reusability low compromise performance upon regeneration. These benefits render strong contenders retaining radioiodine during cleaning annulus exhaust air (during "loss coolant accident").

Language: Английский

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Green mechanochemical synthesis of imine-linked covalent organic frameworks for high iodine capture

Green Chemistry, Journal Year: 2023, Volume and Issue: 25(16), P. 6287 - 6296

Published: Jan. 1, 2023

Delineated here is the first mechanochemical synthesis of covalent organic frameworks (COF) adsorbents that exhibited exceptional iodine adsorption capacities 6.4–7.1 g −1 , surpassing those most existing COFs.

Language: Английский

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Recent advances on covalent organic frameworks (COFs) as photocatalysts: different strategies for enhancing hydrogen generation

Chemical Communications, Journal Year: 2023, Volume and Issue: 59(48), P. 7302 - 7320

Published: Jan. 1, 2023

COF-based materials with different linkages and strategies for photocatalytic hydrogen evolution.

Language: Английский

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Nanoporous N-Rich Covalent Organic Frameworks with High Specific Surface Area for Efficient Adsorption of Iodine and Methyl Iodide

ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 6(19), P. 18177 - 18187

Published: Sept. 26, 2023

With the rapid development of nuclear industry, effective treatment radioactive iodine has become an urgent and challenging task. In this article, we synthesized a nanoporous nitrogen-rich covalent organic framework (TTA-DMTP-COF) with specific surface area up to 2332 m2/g for adsorption (I2) methyl iodide (CH3I). Adsorption experiments showed that TTA-DMTP-COF exhibited I2 CH3I properties; maximum capacity is as high 2.59 g·g–1, 1.60 g·g–1. addition, can effectively adsorb from iodine–cyclohexane solution, amount 516.46 mg/g. Mechanistic studies have shown enter nanopores COF materials form charge transfer complexes various functional groups in (including imines, triazine moieties, residual amino groups). The N-methylation reaction specifically binds nucleophilic N site generates polyiodides during process. Our work demonstrates excellent candidate material capable capturing air solution harsh environments.

Language: Английский

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Porous Organic Cage as an Efficient Platform for Industrial Radioactive Iodine Capture

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(44)

Published: July 30, 2024

Abstract Herein, we firstly develop porous organic cage (POC) as an efficient platform for highly effective radioactive iodine capture under industrial operating conditions (typically ≥150 °C), ≤150 ppmv of I 2 ). Due to the dispersed and readily accessible binding sites well sufficient accommodating space, constructed NKPOC‐DT‐(I − ) (NKPOC=Nankai cage) demonstrates a record‐high uptake capacity 48.35 wt % extraordinary adsorption unit ionic site (~1.62) at 150 °C . The is 3.5, 1.6, 1.3 times higher than silver‐based adsorbents Ag@MOR benchmark materials TGDM 4F‐iCOF‐TpBpy‐I same conditions. Furthermore, )Me exhibits remarkable kinetics (k 1 =0.013 min −1 ), which 1.2 1.6 identical thus sets new adsorbents. This work not only provides insight effectively enhancing functional sites, but also advances POC radioiodine in industry.

Language: Английский

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Sub‐Stoichiometric Covalent Organic Frameworks

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(22)

Published: Jan. 9, 2024

Abstract Covalent organic frameworks (COFs) have garnered significant attention for nearly two decades due to their exceptional structural designs, tunable properties, and wide‐ranging applications. Recently, a novel subclass of COFs known as partially condensed, sub‐stoichiometric (ss‐COFs) has emerged. This presents promising new avenue constructing distinct COF structures in contrast fully stoichiometric (fc‐COFs). ss‐COFs are deliberately designed with periodic unreacted functional groups, thereby giving rise intriguing electronic, optical, catalytic properties. The deviation from conventional approach opens up prospects tailor material properties unexplored Here, this review focuses on the latest advancements breakthroughs ss‐COFs, including topological design, structure characterization, synthetic method, practical From basic designing principles cutting‐edge it will be explored how paving way research pushing boundaries toward scientific technological possibilities.

Language: Английский

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Enzyme Immobilization using Covalent Organic Frameworks: From Synthetic Strategy to COFs Functional Role

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(31), P. 40371 - 40390

Published: July 29, 2024

Enzymes, a class of biocatalysts, exhibit remarkable catalytic efficiency, specificity, and selectivity, governing many reactions that are essential for various cascades within living cells. The immobilization structurally flexible enzymes on appropriate supports holds significant importance in facilitating biomimetic transformations extracellular environments. Covalent organic frameworks (COFs) have emerged as ideal candidates enzyme due to high surface tunability, diverse chemical/structural designs, exceptional stability, metal-free nature. Various techniques been proposed fabricate COF-enzyme biocomposites, offering enhancements activity reusability COF-immobilized well new insights into developing advanced enzyme-based applications. In this review, we provide comprehensive overview state-of-the-art strategies immobilizing COFs by focusing their applicability versatility. These systematically summarized compared categorizing them postsynthesis situ immobilization, where respective strengths limitations thoroughly discussed. Combined with an critical emerging applications, further elucidate the multifaceted roles subsequent highlighting biofunctionality achievable through COFs.

Language: Английский

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The paradigm for exceptional iodine capture by nonporous amorphous electron-deficient cyclophanes

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 465, P. 133449 - 133449

Published: Jan. 5, 2024

Language: Английский

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Theory-driven design of phosphazene-based porous polymer beads for enhanced iodine adsorption

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 345, P. 127321 - 127321

Published: April 1, 2024

Language: Английский

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