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Synthesis and characterization of iodovanadinite using PdI$$_{2}$$, an iodine source for the immobilisation of radioiodine

Johnstone, E. V.*; Bailey, D. J.*; Lawson, S.*; Stennett, M. C.*; Corkhill, C. L.*; Kim, M.*; Heo, J.*; Matsumura, Daiju  ; Hyatt, N. C.*

The synthesis of a palladium-containing iodovanadinite derivative, hypothetically "PdPb$$_{9}$$(VO$$_{4}$$)$$_{6}$$I$$_{2}$$", was attempted using PdI$$_{2}$$ as a source of iodine in searching for a novel waste form for radioiodine. The resulting products were characterized using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, IR spectroscopy, thermal analysis and Pd K XANES. Results showed that PdI$$_{2}$$ can function as a sacrificial iodine source for the formation of iodovanadinite, prototypically Pb$$_{10}$$(VO$$_{4}$$)$$_{6}$$I$$_{2}$$, however, the incorporation of Pd into this phase was not definitively observed. Overall, the key novelty and importance of this work is in demonstrating a method for direct immobilisation of undissolved PdI$$_{2}$$ from nuclear fuel reprocessing, in a composite wasteform in which I-129 is immobilised within a durable iodovandinite ceramic, encapsulating Pd metal.

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Category:Chemistry, Multidisciplinary

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