Hopkins Philip D, Mastren Tara, Florek Justyna, Copping Roy, Brugh Mark, John Kevin D, Nortier Meiring F, Birnbaum Eva R, Kleitz Freddy, Fassbender Michael E
Chemistry Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
Dalton Trans. 2018 Apr 17;47(15):5189-5195. doi: 10.1039/c8dt00404h.
The separation of Th, Pa, and U is of high importance in many applications including nuclear power, nuclear waste, environmental and geochemistry, nuclear forensics and nuclear medicine. Diglycolamide (DGA)-based resins have shown the ability to separate many elements, however, these resins consist of non-covalent impregnation of the DGA molecules on the resin backbone resulting in co-elution of the extraction molecule during separation cycles, therefore limiting their long-term and repeated use. Covalently binding the DGA molecules onto silica is one way to overcome this issue. Herein, measured equilibrium distribution coefficients of normal extraction chromatographic DGA resin and a covalently bound form (KIT-6-N-DGA sorbent) are reported. Several differences are observed between the two systems, the most significant being observed for uranium, which demonstrated significantly lower sorption behavior on KIT-6-N-DGA. These results indicate that U can effectively be separated from Th and Pa using KIT-6-N-DGA, a task that could not be completed with the use of normal DGA alone.
钍、镤和铀的分离在许多应用中具有高度重要性，包括核能、核废料、环境与地球化学、核法医学以及核医学等领域。基于二甘醇酰胺（DGA）的树脂已显示出分离多种元素的能力，然而，这些树脂由DGA分子在树脂主链上的非共价浸渍组成，导致在分离循环过程中萃取分子的共洗脱，因此限制了它们的长期和重复使用。将DGA分子共价结合到二氧化硅上是克服这一问题的一种方法。在此，报告了常规萃取色谱DGA树脂和共价结合形式（KIT-6-N-DGA吸附剂）的测量平衡分配系数。在这两个体系之间观察到了一些差异，其中最显著的是铀，它在KIT-6-N-DGA上表现出明显较低的吸附行为。这些结果表明，使用KIT-6-N-DGA可以有效地将铀与钍和镤分离，而仅使用常规DGA则无法完成这项任务。
