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Complexity of Uranyl Peroxide Cluster Speciation from Alkali-Directed Oxidative Dissolution of Uranium Dioxide

Journal Article · · Inorganic Chemistry
 [1];  [2];  [3];  [2];  [3];  [2];  [4]
  1. Univ. of Notre Dame, IN (United States). Dept. of Civil and Environmental Engineering and Earth Sciences; University of Notre Dame
  2. Univ. of Notre Dame, IN (United States). Dept. of Civil and Environmental Engineering and Earth Sciences
  3. Univ. of Notre Dame, IN (United States). Dept. of Chemistry and Biochemistry
  4. Univ. of Notre Dame, IN (United States). Dept. of Civil and Environmental Engineering and Earth Sciences, and Dept. of Chemistry and Biochemistry
Solid UO2 dissolution and uranium speciation in aqueous solutions that promote formation of uranyl peroxide macroanions was examined, focusing on the role of alkali metals. UO2 powders were dissolved in solutions containing XOH (X = Li, Na, or K) and 30% H2O2. Inductively coupled plasma optical emission spectroscopy (ICP-OES) measurements of solutions revealed linear trends of uranium versus alkali concentration in solutions resulting from oxidative dissolution of UO2, with X:U molar ratios of 1.0, showing that alkali availability determines the U concentrations in solution. The maximum U concentration in solution was 4.36 x 105 parts per million (ppm), which is comparable to concentrations attained by dissolving UO2 in boiling nitric acid, and was achieved by lithium hydroxide-promoted dissolution. Lastly, Raman spectroscopy and electrospray ionization mass spectrometry (ESI-MS) of solutions indicate that dissolution is accompanied by formation of various uranyl peroxide cluster species, the identity of which is alkali concentration-dependent, revealing remarkably complex speciation at high concentrations of base.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA); Univ. of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
NA0003763; SC0001089
OSTI ID:
1460947
Journal Information:
Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 15 Vol. 57; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

In Situ Generation of Organic Peroxide to Create a Nanotubular Uranyl Peroxide Phosphate journal November 2019
In Situ Generation of Organic Peroxide to Create a Nanotubular Uranyl Peroxide Phosphate journal November 2019
Uranyl–Peroxide Capsule Self‐Assembly in Slow Motion journal February 2019
An anionic manganese( ii ) metal–organic framework for uranyl adsorption journal January 2019
In situ Raman spectroscopy of uranyl peroxide nanoscale cage clusters under hydrothermal conditions journal January 2019


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