Liu Ya-Jie, Sun Yi-Fan, Shen Si-Hao, Wang San-Tai, Liu Zhuang-Hua, Fang Wei-Hui, Wright Dominic S, Zhang Jian
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Nat Commun. 2022 Nov 4;13(1):6632. doi: 10.1038/s41467-022-34296-4.
In this paper, we report a unique type of core-shell crystalline material that combines an inorganic zeolitic cage structure with a macrocyclic host arrangement and that can remove trace levels of iodine from water effectively. These unique assemblies are made up of an inorganic Archimedean truncatedhexahedron (tcu) polyhedron in the kernel which possesses six calixarene-like shell cavities. The cages have good adaptability to guests and can be assembled into a series of supramolecular structures in the crystalline state with different lattice pore shapes. Due to the unique core-shell porous structures, the compounds are not only stable in organic solvents but also in water. The characteristics of the cages enable rapid iodine capture from low concentration aqueous I/KI solutions (down to 4 ppm concentration). We have studied the detailed process and mechanism of iodine capture and aggregation at the molecular level. The facile synthesis, considerable adsorption capacity, recyclability, and β- and γ-radiation resistance of the cages should make these materials suitable for the extraction of iodine from aqueous effluent streams (most obviously, radioactive iodide produced by atomic power generation).
在本文中，我们报道了一种独特的核壳晶体材料，它将无机沸石笼结构与大环主体排列相结合，能够有效去除水中的痕量碘。这些独特的组装体由内核中的无机阿基米德截顶八面体（tcu）多面体组成，该多面体具有六个杯芳烃样的壳腔。这些笼子对客体具有良好的适应性，并且可以在晶体状态下组装成一系列具有不同晶格孔形状的超分子结构。由于独特的核壳多孔结构，这些化合物不仅在有机溶剂中稳定，在水中也稳定。笼子的特性使得能够从低浓度的碘/碘化钾水溶液（浓度低至4 ppm）中快速捕获碘。我们在分子水平上研究了碘捕获和聚集的详细过程及机理。笼子的简便合成方法、可观的吸附容量、可回收性以及对β和γ辐射的抗性，使得这些材料适用于从废水流中提取碘（最明显的是从原子能发电产生的放射性碘化物中提取）。
