The need for efficient remediation of the radioactive waste caused by undesirable nuclear accidents and overspending of radionuclides has gained worldwide attention, with extensive recent efforts made to protect the environment from radioactive contamination. Although various treatment processes for the removal of radionuclides and the purification of liquid waste have been reported, the development of a better decontamination method is still necessary for obtaining enhanced desalination performances. Herein, we report a dual-functional composite adsorbent composed of a cellulose acetate membrane as a solid support, gold nanoparticles (AuNPs), and a metal chelating agent which can potentially be used to efficiently remove radioactive iodine and cobalt. In the desalination experiments, the sorption membrane was able to remove cobalt ions rapidly in water. Isotherm data shows that approximately 180 Co2+ atoms were captured per AuNP. Next, the same material was used for the adsorption of iodide anions. Within a few minutes, more than 99% of radioactive iodine was removed even in the presence of other ion species. These findings clearly demonstrate that the desalination method presented in here provides a useful approach for the sequential removal of toxic metal and halogen species in aqueous media.

中文翻译：

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一种用于连续去除水性介质中放射性碘和钴离子的功能化纳米复合吸附剂

对由不良核事故和放射性核素超支引起的放射性废物进行有效补救的需求引起了全世界的关注，最近为保护环境免受放射性污染做出了广泛的努力。尽管已经报道了用于去除放射性核素和净化液体废物的各种处理工艺，但仍需要开发更好的去污方法以获得增强的脱盐性能。在此，我们报告了一种双功能复合吸附剂，由作为固体载体的醋酸纤维素膜、金纳米粒子 (AuNPs) 和金属螯合剂组成，可潜在用于有效去除放射性碘和钴。在海水淡化实验中，吸附膜能够快速去除水中的钴离子。等温线数据显示每个 AuNP 捕获了大约 180 个 Co2+ 原子。接下来，使用相同的材​​料吸附碘阴离子。在几分钟内，即使存在其他离子种类，也能去除 99% 以上的放射性碘。这些发现清楚地表明，这里介绍的脱盐方法为连续去除水性介质中的有毒金属和卤素物质提供了一种有用的方法。