Stability, Composition, and Core-Shell Particle Structure of Uranium(IV)-Silicate Colloids

Environmental Science & Technology
Thomas S NeillSamuel Shaw

Abstract

Uranium is typically the most abundant radionuclide by mass in radioactive wastes and is a significant component of effluent streams at nuclear facilities. Actinide(IV) (An(IV)) colloids formed via various pathways, including corrosion of spent nuclear fuel, have the potential to greatly enhance the mobility of poorly soluble An(IV) forms, including uranium. This is particularly important in conditions relevant to decommissioning of nuclear facilities and the geological disposal of radioactive waste. Previous studies have suggested that silicate could stabilize U(IV) colloids. Here the formation, composition, and structure of U(IV)-silicate colloids under the alkaline conditions relevant to spent nuclear fuel storage and disposal were investigated using a range of state of the art techniques. The colloids are formed across a range of pH conditions (9-10.5) and silicate concentrations (2-4 mM) and have a primary particle size 1-10 nm, also forming suspended aggregates <220 nm. X-ray absorption spectroscopy, ultrafiltration, and scanning transmission electron microscopy confirm the particles are U(IV)-silicates. Additional evidence from X-ray diffraction and pair distribution function data suggests the primary particles are compo...Continue Reading

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Citations

May 24, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Paul EstevenonNicolas Dacheux
Aug 26, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Paul EstevenonNicolas Dacheux
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Jul 19, 2019·Environmental Science & Technology·William R BowerGareth T W Law
Aug 19, 2020·ACS Applied Materials & Interfaces·Aleksej J PopelIan Farnan

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