Jump to main content
Jump to site search


In situ Raman spectroscopy of uranyl peroxide nanoscale cage clusters under hydrothermal conditions

Author affiliations

Abstract

Aqueous solutions containing the nanoscale uranyl peroxide cage clusters U60, [(UO2)(O2)(OH)]6060−, and U60Ox30, [{(UO2)(O2)}60(C2O4)30]60−, were monitored by in situ Raman spectroscopy during stepwise heating to 180 °C. In solutions containing U60, clusters persist to 120 °C, although conversion of U60 to U24, [(UO2)(O2)(OH)]2424−, occurs above 100 °C. U60Ox30 persisted in solutions heated to 150 °C, although partial conversion to smaller uranyl peroxide clusters species was observed beginning at 100 °C. Upon breakdown of the uranyl peroxide cage clusters, uranium precipitated as a compreignacite-like phase, K2[(UO2)3O2(OH)3]2(H2O)7, and metaschoepite, [(UO2)8O2(OH)12](H2O)10. The role of the countercations, oxalate bridge, and solution pH are examined in order to better understand the mobility of these species at elevated temperatures.

Graphical abstract: In situ Raman spectroscopy of uranyl peroxide nanoscale cage clusters under hydrothermal conditions

Back to tab navigation

Supplementary files

Publication details

The article was received on 10 Apr 2019, accepted on 30 Apr 2019 and first published on 30 Apr 2019


Article type: Paper
DOI: 10.1039/C9DT01529A
Dalton Trans., 2019, Advance Article

  •   Request permissions

    In situ Raman spectroscopy of uranyl peroxide nanoscale cage clusters under hydrothermal conditions

    H. L. Lobeck, H. Traustason, P. A. Julien, J. R. FitzPatrick, S. Mana, J. E. S. Szymanowski and P. C. Burns, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT01529A

Search articles by author

Spotlight

Advertisements