Spherical and elastic AWP-CaALG microcapsules (∼700 m in diameter) were obtained and fine crystals of AWP were uniformly immobilized in alginate matrices. The uptake of Cs+, Rb+ and Ag+ in 2 M HNO3 for AWP-CaALG was examined by batch method. The uptake of Cs+ was fairly fast in the initial stage and the uptake equilibrium attained within 5 h. The decreasing order of Kd was Cs+ > Rb+ > Ag+, and the separation factors of Cs/Rb and Cs/Ag were estimated to be over 10, suggesting the selective separation of Cs+. The KdCs value was almost constant over 10 3 cm3/g in the wide concentration range of HNO3 up to 5 M. The uptake (%) of Cs+ in simulated HLLW (SHLLW, 28 components solution, SW-11E, JAEA) was estimated to be 97%, and the distribution of Cs+ into AWP phase and Zr/Ru to alginate phase were observed by EDS analysis. The stepwise chromatographic separation of Cs+ in SHLLW was examined under different eluting conditions using the columns packed with AWP-CaALG xerogels. The stepwise elution conditions were as follows; (1) H 2O→1 M HNO3→5 M HNO3→3 M NH 4NO3→5 M NH4NO3 (25°C), (2) H2O→3 M NH4NO3 (25°C), (3) H 2O→1 M NH4NO3→5 M NH 4NO3 (25°C), (4) H2O→1 M NH 4NO3→ 5 M NH4NO3 (40°C), (5) H2O→1 M NH4NO3→5 M NH 4Cl (25°C). Most effective separation of Cs+ was accomplished under the condition of (3); most of the Rb+ and Ag + ions over 90% were eluted by 1 M NH4NO3, and Cs+ ions eluted by 5 M NH4NO3. The recovery ratio was estimated to be 73.4%. The AWP-CaALG xerogel column is thus effective for the selective separation and recovery of Cs+ from SHLLW.
|出版ステータス||Published - 2013|
|イベント||3rd International Conference on Asian Nuclear Prospects, ANUP 2012 - Beijing, China|
継続期間: 2012 10月 16 → 2012 10月 19
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