Bicarbazolyl-based covalent organic frameworks for highly efficient capture of iodine and methyl iodide

IF 23.2 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Composites and Hybrid Materials Pub Date : 2024-11-12 DOI:10.1007/s42114-024-01063-6
Jiaxin Yang, Qianqian Yan, Hui Hu, Ming Wang, Shenglin Wang, Jianyi Wang, Songtao Xiao, Xiaofang Su, Ping Zhang, Yanan Gao
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Abstract

Development of porous materials with excellent capture performance of radioactive iodides (mainly molecular I2 and organic CH3I) remains an ongoing challenge in nuclear industry. Currently, numerous efforts have been devoted to exploring novel adsorbents with good textural properties like high specific surface and large pore volume. However, some nonporous materials exhibited outstanding iodine adsorption capability. Therefore, it is not yet clear what factors determine the iodine uptake capacity. Herein, a novel paradigm of iodine capture that overturns previous cognition is proposed by exploring some 2D electron-donating nitrogen-containing covalent organic frameworks (COFs). As validated by different pores of 2D COFs shaping from rhombic to hexagonal and ranging from micropores to mesopores, their adsorption capabilities of either molecular I2 or CH3I are more likely to depend on the number of adsorption binding sites, rather than their textural properties. This novel paradigm of iodine capture is of great importance to design of porous materials for disposing of exhaust gases from nuclear power plants.

Graphical Abstract

For two-dimensional covalent organic frameworks that have same topological structure and electron-donating nitrogen-containing fragments with similar adsorption affinity to iodine molecules, their adsorption capabilities, for either molecular I2 or organic CH3I, are more likely to depend on the number of adsorption binding sites, rather than their textural properties like specific surface areas and pore volumes.

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基于双咔唑的共价有机框架用于高效捕获碘和碘化甲烷
开发对放射性碘化物(主要是分子 I2 和有机 CH3I)具有优异捕获性能的多孔材料,仍然是核工业面临的一项持续挑战。目前,许多人都在努力探索具有良好质地特性(如高比表面和大孔隙率)的新型吸附剂。然而,一些无孔材料表现出了出色的碘吸附能力。因此,目前还不清楚是什么因素决定了碘的吸收能力。本文通过对一些二维电子捐赠型含氮共价有机框架(COFs)的研究,提出了一种颠覆以往认知的新型碘捕获范式。二维共价有机框架的孔隙形状从菱形到六角形,从微孔到介孔,这些不同的孔隙验证了它们对分子 I2 或 CH3I 的吸附能力更有可能取决于吸附结合位点的数量,而不是它们的纹理特性。对于具有相同拓扑结构和对碘分子具有相似吸附亲和力的供电子含氮片段的二维共价有机框架,它们对分子 I2 或有机 CH3I 的吸附能力更可能取决于吸附结合位点的数量,而不是它们的纹理特性(如比表面积和孔隙体积)。
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来源期刊
CiteScore
26.00
自引率
21.40%
发文量
185
期刊介绍: Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.
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