Surface complexation modeling of uranium(VI) sorbed onto zirconium oxophosphate versus temperature: Thermodynamic and structural approaches

Almazán-Torres, María Guadalupe; Drot, R.; Mercier‐Bion, Florence; Catalette, H.; Auwer, C. Den; Simoni, E.

doi:10.1016/j.jcis.2008.03.041

Cited by 31 publications

(17 citation statements)

References 51 publications

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“…Consequently, two surface complexes have to be considered for the modeling step. The same behavior has been observed for U(VI) sorption onto Zr 2 O(PO 4 ) 2 [39] and onto ZrP 2 O 7 [52]: two unchanged surface species have been determined between 25 and 90 • C for the same pH range as for the U(VI)/SrTiO 3 system and have been attributed to the interaction of UO 2+ 2 ions with two types of surface sites ≡Zr-OH and ≡P-OH.…”

Section: Spectroscopic Measurementssupporting

confidence: 69%

“…Moreover, considering the pH pzc value of the studied substrate (pH pzc around 9.5 whatever the temperature), we can underline that the position of the obtained sorption edges indicates that the retention process occurs on a globally positive surface. Such a behavior is commonly observed for U(VI)/oxides and U(VI)/phosphates systems [9,39,46,47].…”

Section: Uranyl Sorption Edgesmentioning

confidence: 60%

“…Finck et al [52] showed an increasing uranyl sorbed amount onto zirconium diphosphate when the pH and the temperature are increased. Almazan-Torres et al [39] report the same trend for the sorption of U(VI) onto zirconium oxophosphate. In the same way, previous studies of Eu(III) sorption onto clay minerals performed by E. Tertre et al between 25 and 150 • C, showed a strong influence of the pH and the temperature on the sorption process [53].…”

Section: Uranyl Sorption Edgesmentioning

confidence: 66%

“…(1) and (2), were calculated by simulating the potentiometric titration data using the simulation code oxide solids at room temperature [9,38]. Nevertheless, the capacitance value associated to the best fits for the strontium titanate was 3.1 F m −2 at 298 K which is a value already used for phosphate substrates [31,39]. This value was then adjusted for higher temperatures, considering WSOS/DF together with R 2 related to log(K ) = f (1/T ) plot as criterion of the goodness of the fit.…”

Section: Surface Acidity Constantsmentioning

confidence: 99%

See 3 more Smart Citations

Interaction between U(VI) and SrTiO3 surfaces versus temperature

García-Rosales

Drot

Mercier‐Bion

et al. 2009

Journal of Colloid and Interface Science

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Section: Spectroscopic Measurementssupporting

confidence: 69%

Section: Uranyl Sorption Edgesmentioning

confidence: 60%

Section: Uranyl Sorption Edgesmentioning

confidence: 66%

Section: Surface Acidity Constantsmentioning

confidence: 99%

See 2 more Smart Citations

Interaction between U(VI) and SrTiO3 surfaces versus temperature

García-Rosales

Drot

Mercier‐Bion

et al. 2009

Journal of Colloid and Interface Science

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“…The same group investigated the effect of temperature and organic acids on the sorption properties of ZrP 2 O 7 [17,18] and the effects of temperature on the properties of Zr 2 O(PO 4 ) 2 [19]. Ordonez-Regil et al [20,21] synthesized lanthanum monophosphate (LaPO 4 ) and studied the sorption behavior of UO 2 2?…”

Section: Introductionmentioning

confidence: 99%

Sorption of Eu(III) on Th4(PO4)4P2O7: effects of pH, complexing anions and fulvic acid

Qian

Cui

Liu

et al. 2015

J Radioanal Nucl Chem

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The sorption of Eu(III) on Th 4 (PO 4 ) 4 P 2 O 7 was studied under ambient conditions using the batch technique. The effects of pH, the concentrations of Eu(III) on Th 4 (PO 4 ) 4 P 2 O 7 sorption were investigated. The sorption characteristics of sulfate, phosphate and fulvic acid (FA) on Th 4 (PO 4 ) 4 P 2 O 7 was explored in the presence Eu(III). The results indicated that sorption of Eu(III) on Th 4 (PO 4 ) 4 P 2 O 7 was strongly affected by pH and the concentrations of Eu(III). Eu(III) sorption onto Th 4 (PO 4 ) 4 P 2 O 7 was greatly enhanced in FA and phosphate media than in KNO 3 . The Langmuir, Freundlich and D-R model were used to simulate the sorption isotherms of Eu(III) at four different medium. FA sorption isotherm can be described by Langmuir model in presence and absence of Eu(III) in solution.

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Uranium speciation in river sediments contaminated by phosphate ores

et al. 2011

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Large amounts of phosphate ores with high\ud concentrations of uranium were dumped by a phosphate\ud plant into the Flix water reservoir in the Ebre River,\ud Catalonia, NE Spain. These phosphate wastes have been\ud mixed over the years with effluents from other industries as\ud well as with the sediments of the river, resulting in a\ud complex mixture of solid wastes and sediments. No\ud investigations on uranium speciation in such sediments\ud were made because of the complexity of the sediments\ud composition as well as the relatively low uranium content.\ud However, these studies are necessary in order to predict the\ud release of the uranium to the river waters. Here, we studied\ud uranium speciation in sediments from two sampling points\ud of the Flix water reservoir and at depths from 5 to 113 cm.\ud We used room temperature time-resolved laser fluorescence\ud spectroscopy and a three-step sequential extraction\ud procedure described by the Standards, Measurements, and\ud Testing Programme of the European Union. We found that\ud uranium was mainly present in the sediment samples as\ud meta-autunite [Ca(UO2)2(PO4)2 10–12H2O], whose low\ud solubility will result in a low release of uranium to the river\ud waters. In addition, we found that some uranium was\ud linked to sediments by forming surface complexes. We\ud therefore made the first study of uranium speciation in the\ud sediments of the Flix water reservoir.Peer ReviewedPostprint (published version

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Surface complexation modeling of uranium(VI) sorbed onto zirconium oxophosphate versus temperature: Thermodynamic and structural approaches

Cited by 31 publications

References 51 publications

Interaction between U(VI) and SrTiO3 surfaces versus temperature

Interaction between U(VI) and SrTiO3 surfaces versus temperature

Sorption of Eu(III) on Th4(PO4)4P2O7: effects of pH, complexing anions and fulvic acid

Uranium speciation in river sediments contaminated by phosphate ores

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