Effective capture of radioactive iodine from nuclear fuel reprocessing is of great importance for public safety as well as the secure utility of nuclear energy. In this work, a hydrophobic nanosheet silicalite-1 (NSL-1) zeolite with an adjustable size was developed for efficient iodine (I) and methyl iodide (CHI) adsorption. The optimized all-silica zeolite NSL-1 exhibits an excellent I uptake capacity of 553 mg/g within 45 min and a CHI uptake capacity of 262 mg/g within 1 h. Benefiting from the reduced thickness and enhanced porosity, microporous NSL-1 possesses enhanced iodine adsorption capacity and fast adsorption kinetics, which is a considerable high value among inorganic materials. Unexpectedly, the remarkable characters of high hydrophobicity, acid-resistance and anti-oxidation endow it a higher iodine uptake capacity than traditional aluminosilicate zeolites. More importantly, the high uptake selectivity toward I possessed by NSL-1 owing to its hydrophobic skeleton under simulated dynamic conditions. The low cost, facile and scalable synthesis of NSL-1 further highlights great prospects for applications in the nuclear industry. This work provides useful insights for designing efficient adsorbents for iodine capture.

中文翻译：

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用于捕获碘和碘甲烷的疏水性纳米片silicalite-1沸石


有效捕获核燃料后处理中的放射性碘对于公共安全以及核能的安全利用具有重要意义。在这项工作中，开发了一种尺寸可调的疏水性纳米片silicalite-1（NSL-1）沸石，用于有效吸附碘（I）和碘甲烷（CHI）。优化后的全硅沸石 NSL-1 表现出优异的 I 吸收能力，在 45 分钟内达到 553 mg/g，CHI 吸收能力在 1 小时内达到 262 mg/g。得益于厚度的减小和孔隙率的提高，微孔NSL-1具有增强的碘吸附能力和快速的吸附动力学，在无机材料中具有相当高的价值。出乎意料的是，高疏水性、耐酸性和抗氧化性的显着特性使其比传统的硅铝酸盐沸石具有更高的吸碘能力。更重要的是，NSL-1 由于其疏水性骨架，在模拟动态条件下对 I 具有高摄取选择性。 NSL-1的低成本、简便且可规模化的合成进一步凸显了其在核工业中的巨大应用前景。这项工作为设计有效的碘捕获吸附剂提供了有用的见解。