Study on selective separation of cesium from high level liquid waste using a macroporous silica-based supramolecular recognition absorbent |
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| Authors: | Y. Wu S.-Y. Kim D. Tozawa T. Ito T. Tada K. Hitomi E. Kuraoka H. Yamazaki K. Ishii |
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| Affiliation: | 1. Cyclotron and Radioisotope Center, Tohoku University, 6-3, Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan
2. Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, 6-6-01-2, Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan
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| Abstract: | A macroporous silica-based supramolecular recognition absorbent (Calix[4]?+?Dodecanol)/SiO2?CP, was prepared by successive impregnation and fixing the 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-Calix[4]arene (Calix[4]arene-R14) and its molecule modifier 1-Dodecanol onto SiO2 silica-based polymer support. The characterization of (Calix[4]?+?Dodecanol)/SiO2?CP was examined by thermal gravimetry and differential thermal analysis and electron probe microanalysis. Relatively large separation factors of Cs and other metal ions (?? Cs/M n+ ) above 60 were obtained in the presence of 3?M HNO3. The adsorption data of Cs(I) fitted well with Langmuir isotherm and the maximum adsorption capacity was estimated to be 0.19?mmol?g?1. The Cs(I) in 3?M HNO3 were also effectively adsorption on (Calix[4]?+?Dodecanol)/SiO2?CP in the column operation, and the loaded Cs(I) was successfully eluted with an eluent of H2O. The column packed with (Calix[4]?+?Dodecanol)/SiO2?CP had excellent reusability after three cycles. |
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