Study of uranyl sorption onto hematite by in situ attenuated total reflection–infrared spectroscopy

Lefèvre, Grégory; Noinville, Sylvie; Fédoroff, M.

doi:10.1016/j.jcis.2005.09.016

Cited by 61 publications

(59 citation statements)

References 33 publications

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“…While model calculations predict U-minerals to precipitate under our experimental conditions, Lefèvre et al 29 performed turbidimetric measurements of U(VI) solutions across a range of pH and U concentrations in line with our experimental conditions and found no evidence of U precipitation. Equally, Sylwester et al 30 and Bargar et al 31 found no precipitates in supersaturated 10 ppm uranyl samples at circumneutral pH values, with precipitation of schoepite only occurring at 17 ppm, 31 observed using EXAFS.…”

Section: Theoretical Uranium(vi) Speciationsupporting

confidence: 66%

“…However, the sandstone experiments had substantially more sorption above pH 7. Lefèvre et al 29 found that the U sorption envelope on hematite was shied to higher pH values, with respect to that on ferrihydrite. The wider sorption envelope observed in sandstone in our study is likely a combination of the adsorption on hematite above pH 6 and the sorption to silanol groups between pH 4 and 7.…”

Section: àmentioning

confidence: 99%

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A conceptual model to predict uranium removal from aqueous solutions in water–rock systems associated with low- and intermediate-level radioactive waste disposal

et al. 2017

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a Global stores of radioactive waste are housed in surface stores where actinides are susceptible to environmental release. It is imperative that waste disposal facilities are built to safely contain this waste.However, to do this we must ensure that the engineered and natural barriers are sufficient to prevent the buried materials from migrating through to the surface. Solutions migrating from repositories (ILW and LLW) will have a wide range of chemical compositions and conceptual models constraining the key mineral-water interactions with realistic lithologies are urgently needed. To this end, we conducted experiments to study U removal from solution via mineral-surface interactions with quartz, sandstone, and volcanic rock over a pH range of 2-12, with varying concentrations of U (10 ppb, 0.1 ppm, 1 ppm, and 10 ppm) and with and without bicarbonate added (2 mM) with 0.1 M NaCl electrolyte. We observed that the U concentration in solution had little effect on the extent of U removal from solution as a function of pH or bicarbonate concentration with quartz and sandstone but was important for volcanic rocks, where removal of U, due to adsorption, decreased with increasing U concentration between pH 4 and 8. When bicarbonate was added to solution then the quartz, sandstone, and volcanic rock geomaterials acted similarly in their abilities to immobilize uranium, with an adsorption envelope from pH 4-8 followed by an increase in U removal, likely via precipitation, at high pH.

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Section: Theoretical Uranium(vi) Speciationsupporting

confidence: 66%

Section: àmentioning

confidence: 99%

A conceptual model to predict uranium removal from aqueous solutions in water–rock systems associated with low- and intermediate-level radioactive waste disposal

et al. 2017

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“…In fact the actual threshold appears to depend on the number of reflections in the ATR system. For a monoreflection accessory, a measurement can be made down to 650 cm -1 without large absorption of H 2 O, while for a 25-reflection crystal, the signal becomes noisy below 890 cm -1 (Lefèvre et al, 2006). To be able to record spectra at lower wavenumbers, heavy water (D 2 O) can be used because the absorption bands are shifted by a factor of ca.…”

Section: Limitations In the Wavenumber Rangementioning

confidence: 99%

Attenuated Total Reflection - Infrared Spectroscopy Applied to the Study of Mineral - Aqueous Electrolyte Solution Interfaces: A General Overview and a Case Study

Lefèvre¹,

Preočanin²,

Lützenkirchen³

2012

Infrared Spectroscopy - Materials Science, Engineering and Technology

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“…For uranium sorption, different spectroscopic speciation methods such as TRLIF [9][10][11], FT-IR spectroscopy [12,13], EXAFS [11,13,14], and XPS [15] could be applied because of the high solubility of U(VI) and the possibility of performing sorption experiments at relatively high total metal concentration. This would be impossible for Pu(IV) or other low soluble radionuclides.…”

Section: Xoh Expðàfc=rtþmentioning

confidence: 99%

“…Both spectral studies of uranium on silica and conventional sorption techniques have been used by several research groups to provide data for the modeling. However, certain contradictions can be found and ambiguity remains concerning both the structure of surface complexes and their stability constants [5,6,9,11,13,14].…”

Section: Xoh Expðàfc=rtþmentioning

confidence: 99%

Sorption and Speciation of Uranium on Silica Colloids

Batuk

Shiryaev

Kalmykov

et al. 2011

Actinide Nanoparticle Research

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Sorption behavior of uranium onto silica colloids is studied to derive surface complexation data. Several spectroscopic and structural methods, i.e., Time-resolved Laser-induced Fluorescence (TRLIF), X-ray Absorption Fine Structure (XAFS), and Small-angle X-ray Scattering (SAXS) are employed for characterization of colloid suspensions and surface-sorbed species. TRLIF and EXAFS allowed identification of two principal uranium species on the silica surfacebidentate coordinated uranyl complexes of the following stoichiometries (SiO) 2 UO 2 and (SiO) 2 UO 2 OH À . No polynuclear species or surface precipitates are formed as shown by EXAFS and SAXS examination of suspensions at various silica/uranium ratios. However, when uranium coverage of the silica surface exceeds 7%, the colloid stability as determined by electrophoretic mobility increases. Potentially, this could affect colloid-facilitated transport.

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Study of uranyl sorption onto hematite by in situ attenuated total reflection–infrared spectroscopy

Cited by 61 publications

References 33 publications

A conceptual model to predict uranium removal from aqueous solutions in water–rock systems associated with low- and intermediate-level radioactive waste disposal

A conceptual model to predict uranium removal from aqueous solutions in water–rock systems associated with low- and intermediate-level radioactive waste disposal

Attenuated Total Reflection - Infrared Spectroscopy Applied to the Study of Mineral - Aqueous Electrolyte Solution Interfaces: A General Overview and a Case Study

Sorption and Speciation of Uranium on Silica Colloids

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