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大西 貴士; 小山 真一; Masud, R. S.*; 河村 卓哉*; 三村 均*; 新堀 雄一*
日本イオン交換学会誌, 25(4), p.220 - 227, 2014/11
環境負荷低減および資源有効利用を目的として、原子力機構と東北大学では高レベル放射性廃液中に含まれるCs, Pd, TcおよびMoを高純度で回収するための技術開発を実施している。その一環として、新規に合成した吸着剤(高機能性キセロゲル)を用いて、模擬高レベル放射性廃液(コールド試薬を用いて調製した溶液)中に含まれるCs, Pd, Re(Tcの代替元素)およびMoを、カラム法により選択的に分離できることを見出している。一方で、照射済燃料から調製され放射性元素を含む溶液を用いたカラム試験は実施されていない。よって、本研究では、照射済燃料を酸溶解して照射済燃料溶解液を調製し、その中に含まれるCs, Pd, TcおよびMoを、高機能性キセロゲル充填カラムに吸着/溶離させることを試みた。その結果、照射済燃料溶解液中のCs, Pd, TcおよびMoを吸着/溶離させる条件を見出した。さらに、Tcについては選択的に分離することに成功した。
浅井 志保; Limbeck, A.*
no journal, ,
Impurity patterns of rare earth elements (REEs) are expected to remain invariable when the materials undergo industrial processes owing to the similarity in their chemical properties to each other. Therefore, the REE patterns in a uranium material can be used to make conclusions about the origin of uranium. ICP-MS has been widely applied to the REE measurements because highly sensitive and multi-element measurement is available. In this study, a solid sample introduction technique with laser ablation (LA) has been applied to minimize the preparation procedure of the ICP-MS measurement for obtaining the REE patterns. Cation-exchange resin particle was employed as a substrate to preconcentrate the REEs on solid phase. The count ratios of the REEs in the REE-adsorbed resin particles obtained by the LA-ICP-MS give close agreement with the concentration ratios of the REEs in the elemental ratios in the initial REE solution.
佐伯 誠一; 瀬古 典明; 笈田 多加史*; 山岸 宏造*
no journal, ,
For more practical use of polyethylene terephthalate (PET) waste materials, they should be modified and functionalized in spite of its poor reactivity derived from chemical stability. In this study, we adopted radiation-induced grafting method as a powerful modification tool for functionalization of PET fiber, and tried to synthesize amine type metal adsorbents for newly effective reuse of waste PET materials. At radiation-grafting experiments, glycidyl methacrylate was grafted on PET fiber irradiated with electron beam, and the degree of grafting reached to around 10%. The grafted samples were aminated in 50% ethylene diamine in 2-propanol solution at 40 or 60
C for 15 or 60 minutes. At 60C and 60 minutes for amination process, the resultant samples lost 9% weight by alkali hydrolysis. For evaluating metal adsorption capacity, the aminated fiber put into 100 ppb vanadium aqueous solution and shaked over night, and then the vanadium concentration of the residual solution were evaluated by ICP-MS. The adsorption capacity of the aminated PET fiber showed around 0.9 g-V/kg-adsorbent except for 0.06 g-V/kg-adsorbent of the sample aminated at 40C and 15 minutes. As a result, amine type metal adsorbents based on PET materials were synthesized by radiation-induced grafting method taking into account for proper amination process.
