Developing novel amine-linked covalent organic frameworks towards reversible iodine capture

Mokhtari, Nazanin; Dinari, Mohammad

doi:10.1016/j.seppur.2022.121948

Cited by 41 publications

(30 citation statements)

References 45 publications

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“…That is, TTA-DMTP-COF was exposed to iodine vapor at 75 °C under normal atmospheric pressure to study its I 2 vapor capture behavior (wherein CH 3 I is 25 °C ). The I 2 and CH 3 I vapor trapping performance was evaluated by the weight gain of the samples at different times . As shown in Figure A, TTA-DMTP-COF exhibited rapid I 2 capture with an almost linear increase within 12 h and almost no weight change after 36 h, indicating that the saturated adsorption capacity had been reached.…”

Section: Resultsmentioning

confidence: 98%

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

She,

Wen,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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

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Section: Resultsmentioning

confidence: 98%

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

She,

Wen,

Zhang

et al. 2023

ACS Appl. Nano Mater.

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“…The presence of abundant NH groups in the framework which can lead to the formation of hydrogen bonds with radioactive iodine molecules, made this hydrazine-linked COF an excellent platform for iodine uptake from both gas and solution phases. 93 3.3.3. Water remediation.…”

Section: Environmental Applicationsmentioning

confidence: 99%

Post-synthetic modifications of covalent organic frameworks (COFs) for diverse applications

Rejali,

Dinari,

Wang

2023

Chem. Commun.

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“…This “clean and perfectly straight” pore structure of COFs normally leads to a possible desorption process, i.e., the desorption and adsorption processes occur simultaneously, which limits the further improvement of the maximum iodine adsorption capacity. To address this challenging issue, it is, therefore, necessary to adjust the pore structure and morphology of COFs by controlling the stacking form [ 36 , 37 , 38 , 39 , 40 ] or introducing flexible building blocks [ 41 , 42 , 43 , 44 ]. In this case, the twisted pore structure, rather than the perfectly straight structure, can efficiently expose the adsorption site while hindering the desorption process of iodine molecules, thus leading to the maximum adsorption capacity [ 42 , 43 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

“…To address this challenging issue, it is, therefore, necessary to adjust the pore structure and morphology of COFs by controlling the stacking form [ 36 , 37 , 38 , 39 , 40 ] or introducing flexible building blocks [ 41 , 42 , 43 , 44 ]. In this case, the twisted pore structure, rather than the perfectly straight structure, can efficiently expose the adsorption site while hindering the desorption process of iodine molecules, thus leading to the maximum adsorption capacity [ 42 , 43 , 45 , 46 ]. Therefore, it is highly appealing to design a COF with a molecularly defined pore structure for efficient iodine adsorption.…”

Section: Introductionmentioning

confidence: 99%

Polymorphic Covalent Organic Frameworks: Molecularly Defined Pore Structures and Iodine Adsorption Property

Wang

Jiang

et al. 2023

Molecules

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Radioactive iodine-capturing materials are urgently needed for the emerging challenges in nuclear waste disposal. The various pore structures of covalent organic frameworks (COFs) render them promising candidates for efficient iodine adsorption. However, the detailed structure–property relationship of COFs in iodine adsorption remains elusive. Herein, two polymorphic COFs with significantly different crystalline structures are obtained based on the same building blocks with varied molecular ratios. The two COFs both have high crystallinity, high specific surface area, and excellent chemical and thermal stability. Compared with the [C4+C4] topology (PyT-2) with an AA stacking form, the [C4+C2] topology (PyT-1) with an AB stacking form has more twisted pore channels and complex ink-bottle pores. At ambient conditions, PyT-1 and PyT-2 both exhibit good adsorption properties for iodine capture either in a gaseous or liquid medium. Remarkably, PyT-1 presents an excellent maximum adsorption capacity (0.635 g g−1), and the adsorption limit of PyT-2 is 0.445 g g−1 in an n-hexane solution with an iodine concentration of 400 mg L−1, which is highly comparable to the state-of-the-art iodine absorption performance. This study provides a guide for the future molecular design strategy toward novel iodine adsorbents.

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Developing novel amine-linked covalent organic frameworks towards reversible iodine capture

Cited by 41 publications

References 45 publications

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

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

Post-synthetic modifications of covalent organic frameworks (COFs) for diverse applications

Polymorphic Covalent Organic Frameworks: Molecularly Defined Pore Structures and Iodine Adsorption Property

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