Removal of Cesium Using Cobalt-Ferrocyanide-Impregnated Polymer-Chain-Grafted Fibers
Removal of Cesium Using Cobalt-Ferrocyanide-Impregnated Polymer-Chain-Grafted Fibers
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DOI：
10.1080/18811248.2011.9711817
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发表时间：
2011-10
影响因子：
1.2
通讯作者：
Ryo Ishihara;K. Fujiwara;Takato Harayama;Yusuke Okamura;S. Uchiyama;Mai Sugiyama;T. Someya;Wataru Am
中科院分区：
文献类型：
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作者：
Ryo Ishihara;K. Fujiwara;Takato Harayama;Yusuke Okamura;S. Uchiyama;Mai Sugiyama;T. Someya;Wataru Am
福岛第一核电站目前正在释放放射性同位素，该核电站在9. 0级地震和随后的海啸中受损。核燃料裂变产生的铯-137、铯-134和碘-131预计会严重污染海洋和地面。铯和碘分别以Cs3和I或IO 3的离子形式溶解在水和海水中。铯-137的半衰期（30年）比碘-131的半衰期（8天）要长，因此应将其清除并加以限制。吸附法是去除放射性同位素污染水体中放射性核素的一种可行方法。已知沸石和不溶性金属亚铁氰化物是能够特异性捕获铯-137离子的吸附剂。此外，不溶性金属亚铁氰化物以珠粒或颗粒形式负载到固体载体上，例如多孔阴离子交换树脂、硅胶和沸石。然而，纤维吸附剂对于在处理被放射性同位素污染的水的场所容易操作是有效的。在这里，我们提出了一种新的纤维，可以使用市售的6-尼龙纤维作为起始材料，用于去除铯离子的金属亚铁氰化物。在6-尼龙纤维上接枝的聚合物链之间形成了金属亚铁氰化物（M-FC）的络合物。因此，具有小直径的M-FC浸渍纤维增强了铯离子从液体本体到M-FC颗粒的传质，导致铯离子的快速去除。此外，M-FC浸渍纤维可以制成各种纤维模块，便于现场操作。在这项研究中，钴离子被用作与亚铁氰化钾沉淀的金属离子。二.实验
Radioisotopes are currently being released by Fukushima Daiichi nuclear power plant, which was damaged by the magnitude 9.0 earthquake and the tsunami that followed. Cesium-137, cesium-134, and iodine-131 produced by the fission of nuclear fuels are expected to seriously contaminate the sea and ground. Cesium and iodine dissolve in water and seawater in ionic forms of Csþ and I or IO3 , respectively. Cesium-137, with a longer half-life (30 years) than iodine131 (8 days), should be removed and confined. Adsorption is a feasible method of removing radioactive species from water contaminated with radioisotopes. Zeolites and insoluble metal ferrocyanides are known as adsorbents capable of specifically capturing cesium-137 ions. Moreover, the insoluble metal ferrocyanides are loaded onto solid supports in bead or granule form such as porous anionexchange resins, silica gels, and zeolites. However, fibrous adsorbents are effective for easy operation at sites for processing water contaminated with radioisotopes. Here, we propose a novel fiber that can immobilize metal ferrocyanides for the removal of cesium ions using a commercially available 6-nylon fiber as a starting material. Precipitates of metal ferrocyanide (M-FC) were formed among the polymer chains grafted onto the 6-nylon fiber. Therefore, the M-FC-impregnated fibers with a small diameter enhance the mass transfer of cesium ions from the bulk of liquid to the M-FC particles, leading to the rapid removal of cesium ions. In addition, the M-FC-impregnated fibers can be fabricated into various fiber modules for easy operation at the sites. In this study, the cobalt ion was used as a metal ion that precipitates with potassium ferrocyanide. II. Experimental