化学
微型多孔材料
铯
吸附
离子交换
硫化物
分配系数
水溶液
洗脱
放射性废物
放射性示踪剂
无机化学
选择性
吸附
放射化学
离子
核化学
色谱法
有机化学
催化作用
物理
核物理学
作者
Jun Yan,Bo Zhang,Jun Li,Yan Yang,Yaning Wang,Yongdi Zhang,Xiao-Zhuo Liu
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2023-08-03
卷期号:62 (32): 12843-12850
被引量:1
标识
DOI:10.1021/acs.inorgchem.3c01507
摘要
The fast and efficient removal of 137Cs+ 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 Kd value up to 3.53 × 104 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.
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