NO2-mediated voloxidation for iodine separation from cesium iodide surrogates

Johnson, Katherine R.; Greaney, Allison T.; Peruski, Kathryn M.; Cobble, Chase; Vick, Matthew C.; Glasgow, David; McFarlane, Joanna

doi:10.1080/01496395.2024.2428363

NO₂-mediated voloxidation for iodine separation from cesium iodide surrogates

Journal Article · Tue Nov 19 00:00:00 EST 2024 · Separation Science and Technology

DOI:https://doi.org/10.1080/01496395.2024.2428363· OSTI ID:2480049

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Heterogeneous NO₂-mediated oxidation of uranium, also known as advanced voloxidation, is a proposed head-end reprocessing method for used nuclear fuel. An advantage of advanced voloxidation is the removal of volatile fission products, which complicate downstream separation and containment challenges leading to increased processing economics. Iodine, one of the volatile species of interest, has exhibited varied results in this process. Using CsI as a surrogate material, this work mimics the effect of NO₂-based voloxidation on iodine and sheds light on the factors that influence the solid–gas phase reaction. Solid-state analysis using Fourier transform infrared attenuated total reflectance spectroscopy and scanning electron microscopy with energy-dispersive X-ray spectroscopy confirmed the conversion of CsI to CsNO₃. Iodine separation ranged from 46% to 100% across multiple tests. Iodine separation was most effective when multiple recharges of NO₂ were administered. In conclusion, at the bench scale, liberating iodine from CsI appears to occur within 1 h, but the presence of surface H₂O and the composition of the NO_x reagent mixtures greatly influence its success.

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This content will become publicly available on Wed Nov 19 00:00:00 EST 2025

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2480049

Journal Information:: Separation Science and Technology, Journal Name: Separation Science and Technology; ISSN 0149-6395

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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NO₂-mediated voloxidation for iodine separation from cesium iodide surrogates