ic9b00230_si_001.pdf (4.76 MB)
Transformation of Uranyl Peroxide Studtite, [(UO2)(O2)(H2O)2](H2O)2, to Soluble Nanoscale Cage Clusters
journal contribution
posted on 2019-05-01, 00:00 authored by Haylie L. Lobeck, Jordan K. Isner, Peter C. BurnsThe dissolution behavior
of uranyl peroxide studtite, [(UO2)(O2)(H2O)2](H2O)2, was examined
under a wide range of alkaline aqueous environments with and without
the addition of hydrogen peroxide. In the absence of added H2O2, studtite dissolved in aqueous solutions with a tetraethylammonium
hydroxide to uranium molar ratio greater than 0.5, and the resulting
species in solution characterized by Raman spectroscopy and electrospray
ionization mass spectrometry (ESI-MS) is the uranyl peroxide nanocluster
U24, [(UO2)(O2)(OH)]2424–. This is the first demonstration of the formation
of uranyl peroxide nanoclusters from studtite in a solution lacking
additional hydrogen peroxide. In similar systems containing added
hydrogen peroxide (0.01 M – 1.0 M), studtite dissolved in solutions
with a TEAOH to uranium ratio greater than 0.1, and the resulting
uranyl peroxide species in solution was U28, [(UO2)(O2)1.5]2828–.
