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Cesium separation from aqueous streams by calix-monocrown-arene

Simonnet, M.  ; 宮崎 有史*; 鈴木 伸一; 小林 徹 ; 土井 玲祐 ; 塩飽 秀啓  ; 矢板 毅

Simonnet, M.; Miyazaki, Yuji*; Suzuki, Shinichi; Kobayashi, Toru; Doi, Reisuke; Shiwaku, Hideaki; Yaita, Tsuyoshi

$$^{137}$$Cs is one of the highest heat generators in nuclear waste. Removing it prior to deep geological disposal can thus help reducing the necessary volumes and costs of the final repository. This isotope is also one of the main contaminants that was released during the Fukushima Nuclear Power Plant accident. Liquid-liquid extraction can be a suitable method for decontamination. In this study, seven different extractants from the calix-mono-crown-arene family have been compared as respect to distribution ratio, separation factors and closer atoms distances to cesium. Distribution ratios also strongly depend on diluent nature. EXAFS study was thus conducted on two extractants in chloroform and 2-nonanone to investigate whether diluent nature can impact the cesium-ligand complex itself. Spectra showed that whilst no difference was observed on the first coordination shell, diluent nature impacted the second shell. However, oxygen positions remained similar in both diluents, leading to a probable change in benzene $$pi$$-electron interaction with cesium.

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