Radioactive iodine is one of the main substances existed in nuclear wastes. It can quickly diffuse into the atmosphere causing great harm to environment and human health. Therefore, how to capture radioactive iodine efficiently has become a research hotspot. Herein, a covalent organic framework (COF) material (COF-1) has been synthesized by aldimine condensation reaction using the 1,3,5-triazine structure compound and isophthalaldehyde as starting materials. The nitrogen-rich COF-1 possesses medium specific surface area (321.78 m2/g), a pore diameter of 1.98 nm and relatively regular layered stack structure, which provide good conditions for iodine adsorption ability. The maximum iodine uptake of COF-1 is 2647 mg/g, which is higher than most iodine adsorbents reported. Subsequently, the release of iodine can be achieved in methanol indicating the iodine adsorption of COF-1 is a reversible process. It is also shown that COF-1 can be recycled. These characteristics maybe make COF-1 materials as a good iodine capturer in practical applications.

中文翻译：

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一种基于C=N键的共价有机骨架（COF）的合成及其优异的碘吸附性能

放射性碘是核废料中存在的主要物质之一。它可以迅速扩散到大气中，对环境和人体健康造成极大危害。因此，如何高效地捕获放射性碘成为研究热点。在此，以1,3,5-三嗪结构化合物和间苯二醛为原料，通过醛亚胺缩合反应合成了共价有机骨架（COF ）材料（COF-1 ）。富氮COF-1具有中等比表面积（321.78 m2/g）、1.98 nm孔径和相对规则的层状堆叠结构，为碘吸附能力提供了良好的条件。COF-1的最大碘摄取量为 2647 mg/g，高于报道的大多数碘吸附剂。随后，可以在甲醇中实现碘的释放，表明COF-1的碘吸附是一个可逆过程。还表明COF-1可以回收利用。这些特性可能使COF-1材料在实际应用中成为一种很好的碘捕获剂。