Separation of trivalent actinides from lanthanides by using R-BTP resins and stability of R-BTP resin
Separation of trivalent actinides from lanthanides by using R-BTP resins and stability of R-BTP resin
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DOI：
10.1016/j.jallcom.2005.04.128
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发表时间：
2006-02
影响因子：
6.2
通讯作者：
H. Hoshi;Yuezhou Wei;M. Kumagai;T. Asakura;Y. Morita
中科院分区：
文献类型：
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作者：
H. Hoshi;Yuezhou Wei;M. Kumagai;T. Asakura;Y. Morita
在开发先进的水溶液后处理系统中，分离微量三价锕系元素（MA=Am和Cm）是一个重要的课题。MA是具有长半衰期的α发射体，因此期望从裂变产物中分离MA。然而，由于MA与镧系元素（Ln）的化学相似性，将它们分离是非常困难的。为了分离这两组元素，基于与萃取剂形成络合物的差异，溶剂萃取过程已被广泛研究。萃取色谱是从溶液中回收少量目标组分的最有前途的分离技术之一。为此，我们将苯乙烯-二乙烯基苯共聚物（Styrene-Divinylbenzene，简称苯乙烯-二乙烯苯共聚物）固定在平均粒径为50μm的多孔二氧化硅颗粒中，通过浸渍R-BTP分子，制备了一种新型的硅基萃取树脂。浸渍树脂不仅在硝酸钠溶液中而且在硝酸溶液中对Am对Ln（III）都有很高的亲和性。还检查了浸提树脂的稳定性。二氧化硅基载体对γ射线和硝酸具有显着的稳定性。部分R-BTP由于质子化作用而从萃淋树脂中溶于硝酸溶液中。然而，支化R-BTP（iso-Bu-BTP）树脂在硝酸溶液（≤ 3 M）中比正常R-BTP稳定得多。
For the development of advanced aqueous reprocessing system, it is one of the most important subjects to separate minor trivalent actinides (MA=Am and Cm). MA are α-emitters with long half-life, therefore it is desired to separate MA from fission products. However, it is very difficult to separate MA from lanthanides (Ln) owing to their chemical similarity. For the separation of these two groups of elements, solvent extraction process has been widely studied based on the difference in complex formation with extractants. Extraction chromatography is one of the most promising separation techniques for recovering small amounts of target components from solution. For this purpose, we prepared novel silica-based extraction resins by impregnating some R-BTP molecules into a macroreticular styrene–divinylbenzene copolymer which is immobilized in porous silica particles with a mean diameter of 50μm. The impregnated resin has high affinity for Am against Ln(III) not only in sodium nitrate solution but also in nitric acid solution. Stability of the extraction resin was also examined. The silica-based support was significantly stable against γ-irradiation and nitric acid. A part of R-BTP was dissolved into nitric acid solution from the extraction resin due to protonation. However, the branched R-BTP (iso-Bu-BTP) resin was much more stable than a normal R-BTP in nitric acid solution (≤3M).