Yan Jie, Zhang Bo, Li Jun, Yang Yan, Wang Ya-Ning, Zhang Yong-Di, Liu Xiao-Zhuo
Department of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, Shandong, China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, Fujian, China.
Inorg Chem. 2023 Aug 14;62(32):12843-12850. doi: 10.1021/acs.inorgchem.3c01507. Epub 2023 Aug 3.
The fast and efficient removal of Cs ions from water is of great significance for the further treatment and disposal of highly active nuclear waste. Hitherto, although many layered metal sulfides have been proven to be very effective in capturing aqueous cesium, three-dimensional (3D) microporous examples have rarely been explored, especially compounds that are systematically used to study cesium ion exchange behaviors. In this paper, we present detailed Cs ion exchange properties of a 3D, microporous, zeolitic-like sulfide, namely K@GaSnS-1, in different conditions. Isotherm studies indicate that K@GaSnS-1 has a high cesium saturation capacity of 249.3 mg/g. In addition, it exhibits rapid sorption kinetics, with an equilibrium time of only 2 min. Further studies show that K@GaSnS-1 also displays a strong preference and good selectivity for cesium, with the highest distribution coefficient value up to 3.53 × 10 mL/g. Also noteworthy is that the excellent cesium ion exchange properties are well-maintained despite acidic, basic, and competitive multiple-component environments. More importantly, the Cs-exchanged products can be easily eluted and regenerated by a low-cost and eco-friendly method. These merits demonstrated by K@GaSnS-1 render it very promising in the effective and efficient separation of radioactive cesium from nuclear waste.
从水中快速高效去除铯离子对于高放核废料的进一步处理和处置具有重要意义。迄今为止，尽管许多层状金属硫化物已被证明在捕获水溶液中的铯方面非常有效，但三维（3D）微孔材料的例子却很少被探索，尤其是系统用于研究铯离子交换行为的化合物。在本文中，我们详细介绍了一种三维微孔类沸石硫化物K@GaSnS-1在不同条件下的铯离子交换特性。等温线研究表明，K@GaSnS-1具有249.3 mg/g的高铯饱和容量。此外，它表现出快速的吸附动力学，平衡时间仅为2分钟。进一步的研究表明，K@GaSnS-1对铯也表现出强烈的偏好和良好的选择性，最高分配系数值高达3.53×10 mL/g。同样值得注意的是，尽管存在酸性、碱性和竞争性多组分环境，其优异的铯离子交换性能仍能得到很好的保持。更重要的是，铯交换产物可以通过低成本且环保的方法轻松洗脱和再生。K@GaSnS-1所展示的这些优点使其在从核废料中有效分离放射性铯方面非常有前景。
