Highly Selective and Rapid Uptake of Radionuclide Cesium Based on Robust Zeolitic Chalcogenide via Stepwise Ion-Exchange Strategy

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• 作者：Huajun Yang ; Min Luo ; Li Luo ; Hongxiang Wang ; Dandan Hu ; Jian Lin ; Xiang Wang ; Yanlong Wang ; Shuao Wang ; Xianhui Bu ; Pingyun Feng ; Tao Wu
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：December 13, 2016
• 年：2016
• 卷：28
• 期：23
• 页码：8774-8780
• 全文大小：429K
• ISSN：1520-5002

文摘

The safe use of nuclear energy requires the development of advanced adsorbent technology to address environment damage from nuclear waste or accidental release of radionuclides. Recently developed amine-directed chalcogenide frameworks have intrinsic advantages as ion-exchange materials to capture radionuclides, because their exceptionally negative framework charge can lead to high cation-uptake capacity and their 3-D multidimensional intersecting channel promotes rapid ion diffusion and offer a unique kinetic advantage. Prior to this work, however, such advantages could not be realized because organic cations in the as-synthesized materials are sluggish during ion exchange. Here we report an ingenious approach on the activation of amine-directed zeolitic chalcogenides through a stepwise ion-exchange strategy and their use in cesium adsorption. The activated porous chalcogenide exhibits highly enhanced cesium uptake compared to the pristine form and is comparable to the best metal chalcogenide sorbents so far. Further ion-exchange experiments in the presence of competing ions confirm the high selectivity for cesium ions. Excellent removal performance has also been observed in real water samples, highlighting the importance of stepwise ion exchange strategy to activate amine-directed chalcogenide framework for ¹³⁷Cs⁺ removal.