Extraction of local coordination structure in a low-concentration uranyl system by XANES

Zhang, Linjuan; Zhou, Jing; Zhang, Jianyong; Su, Jing; Zhang, Shuo; Chen, Ning; Jia, Yunpeng; Li, Jiong; Wang, Yu; Wang, Jian Qiang

doi:10.1107/s1600577516001910

Cited by 24 publications

(27 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Uranyl-ammonium carbonate (NH 4 ) 4 UO 2 (CO 3 ) 3 was obtained by the following procedure (Zhang et al, 2016): 0.501 g of UO 2 (NO 3 ) 2 Á6H 2 O (1 mmol) was dissolved in 3 ml Milli-Q H 2 O, and a yellow precipitate was formed during slow dropwise addition of 5 ml of solution containing 1.646 g (NH 4 ) 2 CO 3 (17 mmol) in Milli-Q H 2 O. The obtained supernatant was centrifuged at 7000 rpm for 2 min.…”

Section: Methodsmentioning

confidence: 99%

From EXAFS of reference compounds to U(VI) speciation in contaminated environments

Krot¹,

Vlasova²,

Trigub³

et al. 2022

J Synchrotron Rad

View full text Add to dashboard Cite

Understanding the speciation of technogenic uranium in natural systems is crucial for estimating U migration and bioavailability and for developing remediation strategies for contaminated territories. Reference EXAFS data of model laboratory-prepared uranium compounds (`standards') are necessary to analyze U-contaminated samples from nuclear legacy sites. To minimize errors associated with measurements on different synchrotrons, it is important not only to compare data obtained on environmentally contaminated samples with the literature but also with `standards' collected at the same beamline. Before recording the EXAFS spectra, all reference compounds were thoroughly characterized by Raman spectroscopy and powder X-ray diffraction. The U(VI) local molecular environments in the reference compounds, i.e. uranyl oxyhydroxides, phosphates, carbonates and uranates, were examined using XAFS. Based on the EXAFS fitting results obtained, including the nature of the bonding, interatomic distances and coordination numbers, parameters that are typical for a particular U compound were differentiated. Using data for `standards', U speciation in the sample of radioactively contaminated soil was determined to be a mixture of U oxyhydroxide and carbonate phases.

show abstract

Section: Methodsmentioning

confidence: 99%

From EXAFS of reference compounds to U(VI) speciation in contaminated environments

Krot¹,

Vlasova²,

Trigub³

et al. 2022

J Synchrotron Rad

View full text Add to dashboard Cite

show abstract

“…For instance, polyacrylonitrile polymers are easily functionalized with amidoxime groups, which makes these types of materials of particular interest for extracting U(VI) from sea water. The coordination geometry of uranium adsorbed to amidoxime have been studied using extended x-ray absorption fine structure (EXAFS) [240], X-ray absorption near-edge structure (XANES) [241], density function theory (DFT) [242,243], as well as Raman and IR spectroscopy [242,244–246]. DFT studies suggested that uranyl coordinated with amidoxime groups form tridentate or η 2 – coordination structures [243].…”

Section: Surface Speciation Studied By Ir and Raman Spectroscopiesmentioning

confidence: 99%

Detection and identification of solids, surfaces, and solutions of uranium using vibrational spectroscopy

Haes

Forbes

2018

Coordination Chemistry Reviews

133

128

View full text Add to dashboard Cite

The purpose of this review is to provide an overview of uranium speciation using vibrational spectroscopy methods including Raman and IR. Uranium is a naturally occurring, radioactive element that is utilized in the nuclear energy and national security sectors. Fundamental uranium chemistry is also an active area of investigation due to ongoing questions regarding the participation of 5f orbitals in bonding, variation in oxidation states and coordination environments, and unique chemical and physical properties. Importantly, uranium speciation affects fate and transportation in the environment, influences bioavailability and toxicity to human health, controls separation processes for nuclear waste, and impacts isotopic partitioning and geochronological dating. This review article provides a thorough discussion of the vibrational modes for U(IV), U(V), and U(VI) and applications of infrared absorption and Raman scattering spectroscopies in the identification and detection of both naturally occurring and synthetic uranium species in solid and solution states. The vibrational frequencies of the uranyl moiety, including both symmetric and asymmetric stretches are sensitive to the coordinating ligands and used to identify individual species in water, organic solvents, and ionic liquids or on the surface of materials. Additionally, vibrational spectroscopy allows for the in situ detection and real-time monitoring of chemical reactions involving uranium. Finally, techniques to enhance uranium species signals with vibrational modes are discussed to expand the application of vibrational spectroscopy to biological, environmental, inorganic, and materials scientists and engineers.

show abstract

“…Similar analyses relating the position of a scattering peak to a bond length have been pursued by other authors, especially in the field of actinide chemistry. 45,46 In addition to the electronic structure of Ni, the Mn and Co atoms were probed via operando XANES measurements at a C/5 cycle rate. The electrochemical measurements for both experiments are presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Laboratory-Based X-ray Absorption Spectroscopy on a Working Pouch Cell Battery at Industrially-Relevant Charging Rates

Jahrman

Pellerin

Ditter

et al. 2019

J. Electrochem. Soc.

View full text Add to dashboard Cite

Li-ion battery (LIB) research has continuing importance for the entire range of applications from consumer products to vehicle electrification and grid stabilization. In many cases, standard electrochemical methods only provide an overall voltage or specific capacity, giving an inadequate description of parallel redox processes or chemical gradients at the particle and pack level. X-ray absorption fine structure (XAFS) is frequently used to augment bulk electrochemical data, as it provides element-specific changes in oxidation state and local atomic structure. Such microscopic descriptors are crucial for elucidating charge transfer and structural changes associated with bonding or site mixing, two key factors in evaluating state of charge and modes of cell failure. However, the impact of XAFS on LIB research has been significantly constrained by a logistical barrier: contemporary XAFS work is performed almost exclusively at synchrotron x-ray light sources, where beamtime is infrequent and experiment time-frames are limited. Here we show that modern laboratory based XAFS can not only be applied to, e.g., characterization of ex situ LIB electrode materials, but can also be used for operando studies at industrially-relevant charging rates in a standard pouch cell preparation. Such capability enables accelerated discovery of new materials and improved operation modes for LIBs.(*)

show abstract

Extraction of local coordination structure in a low-concentration uranyl system by XANES

Cited by 24 publications

References 81 publications

From EXAFS of reference compounds to U(VI) speciation in contaminated environments

From EXAFS of reference compounds to U(VI) speciation in contaminated environments

Detection and identification of solids, surfaces, and solutions of uranium using vibrational spectroscopy

Laboratory-Based X-ray Absorption Spectroscopy on a Working Pouch Cell Battery at Industrially-Relevant Charging Rates

Contact Info

Product

Resources

About