Radioactive Iodine Capture in Silver-Containing Mordenites through Nanoscale Silver Iodide Formation
Radioactive Iodine Capture in Silver-Containing Mordenites through Nanoscale Silver Iodide Formation
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DOI：
10.1021/ja103110y
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发表时间：
2010-07-07
影响因子：
15
通讯作者：
Nenoff, Tina M.
中科院分区：
文献类型：
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作者：
Chapman, Karena W.;Chupas, Peter J.;Nenoff, Tina M.
放射性碘（(129)I）的有效捕获和储存仍然是安全核废料储存和安全核能的一个强烈关切。含银丝光沸石（MOR）是碘捕获的长期基准；然而，开发更有效的碘吸收剂所需的分子水平对这一过程的理解仍然难以捉摸。本文用微分对分布函数分析方法探讨了含银MOR吸附碘的结构和分布。虽然碘分布在沸石表面的γ - agi纳米颗粒和还原银交换MOR孔内的亚纳米α - agi团簇之间，但在未还原银交换MOR的情况下，碘仅以亚纳米α - agi的形式局限于孔中。因此，未还原的含银沸石可能为放射性碘捕获提供更安全的途径，有可能更有效地捕获碘以进行长期储存。
The effective capture and storage of radiological iodine ((129)I) remains a strong concern for safe nuclear waste storage and safe nuclear energy. Silver-containing mordenite (MOR) is a longstanding benchmark for iodine capture; however, the molecular level understanding of this process needed to develop more effective iodine getters has remained elusive. Here we probe the structure and distribution of iodine sorbed by silver-containing MOR using differential pair distribution function analysis. While iodine is distributed between gamma-AgI nanoparticles on the zeolite surface and subnanometer alpha-AgI clusters within the pores for reduced silver MOR, in the case of unreduced silver-exchanged MOR, iodine is exclusively confined to the pores as subnanometer alpha-AgI. Consequently, unreduced silver-containing zeolites may offer a more secure route for radioactive iodine capture, with the potential to more effectively trap the iodine for long-term storage.