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

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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.