Construction of Removel System of Cesium Ion by Cosedimentation with Organic Macrocyclic Molecules

2011年3月11日福岛第一核电站发生核泄漏事故后，高浓度放射性物质散落在环境中。放射性铯的去除已经成为一个严重的问题。本研究采用络合共沉淀法合成了一种捕集铯离子的有机大环化合物，并于2012年通过ESI-MS-CAD方法筛选了几种候选化合物，设计并合成了一种化合物。2013年，该化合物被大规模合成，成功获得了高分子量的聚酰胺。然后制备了一种具有高密度铯离子结合位点的薄膜，并利用QCM方法评价了该薄膜的捕集能力和离子选择性，利用IPC-MS方法评价了该薄膜的缔合常数和分配系数。虽然离子选择性不如无机铯离子吸附剂，但捕集能力相当，似乎是一种很好的材料，通过焚烧将具有减少体积的效果。

By the accident of Fukushima Daiichi nuclear power plant at March 11, 2011, highly concentrated radioactive materials were strewn in the environment. Removal of radioactive cesium has become a serious issue. In this study, we prepared an organic macrocyclic compound for cesium ion capturing by complexation and cosedimentation.In 2012, the several candidates were screened by an ESI-MS-CAD method and one compound was designed and synthesized. In 2013, the compound was synthesized in a large scale to successfully obtain a polyamide with high molecular weight. Then we prepared a thin film with a high dense cesium ion binding sites and evaluated the trapping ability and ion-selectivity by using a QCM method,and the association constant and partition coefficient by an IPC-MS method. Though the ion-selectivity was inferior to that of inorganic cesium ion adsorbents, the trapping ability is equivalent and seemed to be a good material that would have the reducing volume effect by incineration.