XPS determination of uranium oxidation states

ES Ilton, PS Bagus - Surface and Interface Analysis, 2011 - Wiley Online Library
This contribution is both a review of different aspects of X‐ray photoelectron spectroscopy
that can help one determine U oxidation states and a personal perspective on how to …

Uranium redox transformations after U (VI) coprecipitation with magnetite nanoparticles

I Pidchenko, KO Kvashnina, T Yokosawa… - … science & technology, 2017 - ACS Publications
Uranium redox states and speciation in magnetite nanoparticles coprecipitated with U (VI)
for uranium loadings varying from 1000 to 10 000 ppm are investigated by X-ray absorption …

Higher Order Speciation Effects on Plutonium L3 X-ray Absorption Near Edge Spectra

SD Conradson, KD Abney, BD Begg… - Inorganic …, 2004 - ACS Publications
Pu L3 X-ray near edge absorption spectra for Pu (0− VII) are reported for more than 60
chalcogenides, chlorides, hydrates, hydroxides, nitrates, carbonates, oxy-hydroxides, and …

Local Structure and Charge Distribution in the UO2−U4O9 System

SD Conradson, D Manara, F Wastin, DL Clark… - Inorganic …, 2004 - ACS Publications
Analysis of X-ray absorption fine structure spectra of UO2+ x for x= 0− 0.20 (UO2− U4O9)
reveals that the adventitious O atoms are incorporated as oxo groups with U− O distances of …

Thermodynamics of uranium minerals and related materials

A Navrotsky, T Shvareva, X Guo, PA Rock - 2013 - pubs.geoscienceworld.org
Uranium in natural systems exists in two oxidation states: tetravalent and hexavalent. The
aqueous chemistry and geologic and environmental transport of U is dominated by U 6+ …

Electrochemical and complexation behavior of neptunium in aqueous perchlorate and nitrate solutions

A Ikeda-Ohno, C Hennig, A Rossberg, H Funke… - Inorganic …, 2008 - ACS Publications
Electrochemical and complexation properties of neptunium (Np) are investigated in aqueous
perchlorate and nitrate solutions by means of cyclic voltammetry, bulk electrolysis, UV …

Reduction of U (VI) by Fe (II) during the Fe (II)-accelerated transformation of ferrihydrite

DD Boland, RN Collins, CJ Glover… - … science & technology, 2014 - ACS Publications
X-ray absorption spectroscopy has been used to study the reduction of adsorbed U (VI)
during the Fe (II)-accelerated transformation of ferrihydrite to goethite. The fate of U (VI) was …

Reduction of U (VI) incorporated in the structure of hematite

ES Ilton, JSL Pacheco, JR Bargar, Z Shi… - … science & technology, 2012 - ACS Publications
U (VI) doped hematite was synthesized and exposed to two different organic reductants with
E 0 of 0.23 and 0.70 V. A combination of HAADF-TEM and EXAFS provided evidence that …

Molten salts for efficient removal of radioactive contaminants from stainless steel surface: Mechanisms and applications

H Lv, J Gao, J Chen, T Li, Y Liang, B Hu, F Ma… - Environmental …, 2023 - Elsevier
Here, we have demonstrated an innovative decontamination strategy using molten salts as a
solvent to clean stubborn uranium contaminants on stainless steel surfaces. The aim of this …

Oxidation and crystal field effects in uranium

JG Tobin, SW Yu, CH Booth, T Tyliszczak, DK Shuh… - Physical Review B, 2015 - APS
An extensive investigation of oxidation in uranium has been pursued. This includes the
utilization of soft x-ray absorption spectroscopy, hard x-ray absorption near-edge structure …