Synthesis of Silica-Based Anion Exchangers with Pyridine-Groups and Their Application to the Reprocessing of Spent Nuclear Fuels
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As a fundamental study on the reprocessing of spent nuclear fuel by ion exchange method, silica-based anion exchangers of about 50μm in particle size with tertiary and quaternary pyridine groups were synthesized. Adsorption and elution behavior of Pd and Ru in nitric acid medium was examined experimentally. Furthermore, column separation experiments were carried out on the simulated spent fuel solution containing U (VI) and some typical fission product elements. The adsorption of Pd (II) and Ru (III) onto the anion exchanger with quaternary pyridine group, SiPyR-N4, showed rapid kinetics and was considered to result from the anion exchange reaction of the nitrato-complexes of these metals. On the other hand, the anion exchanger with the weak-base group of tertiary pyridine, SiPyR-N3, showed significantly strong adsorption for Pd (II) and the adsorption was presumed to be caused by the complex formation reaction between Pd (II) and the nitrogen atom in the functional group. Palladium ion adsorbed on SiPyR-N4 was effectively eluted out by using ethylenediamine as an eluent, while the elution of Pd (II) from SiPyR-N3 was very difficult. The separation experiments using SiPyR-N4 packed column demonstrated that U (VI) was successfully separated from most fission product elements. However, a part of the light rare earths such as Nd and a small amount of Ru mixed in the U product solution. Pd was strongly adsorbed on the SiPyR-N4 and it was finally eluted off by using the solution containing ethylenediamine.
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