Development of regenerative polymer adsorbent for reducing volume of radiocesium from waste zeolite

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We have developed a derivative of benzo-crown ether, mono-acetyl substituted dibenzo-20-crown-6-ether (ace-DB20C6), which exhibits high selectivity for cesium in comparison with sodium and potassium in aqueous solution. Ace-DB20C6 was fixed on the surface of polymer particles or inside the pores of silica gel particles to use as an adsorbent for radioactive cesium ions. Moreover, we elucidated the coordination structure of the complex of ace-DB20C6 with cesium and the interaction between them, through small-angle neutron scattering observation and density functional theory (DFT) calculation, revealing that the special selectively for cesium by ace-DB20C6 arises from the interaction between the pi-orbitals of the two benzene rings and the d orbital of cesium.