European Journal of Chemistry 2016, 7(1), 42-48 | doi: https://doi.org/10.5155/eurjchem.7.1.42-48.1348 | Get rights and content

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Application of the de Job method in the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite


Ewelina Grabias (1) , Agnieszka Gładysz-Płaska (2) , Agnieszka Lipke (3) , Stanisław Pikus (4) , Marek Majdan (5,*)

(1) Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland
(2) Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland
(3) Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland
(4) Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland
(5) Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland
(*) Corresponding Author

Received: 23 Oct 2015 | Accepted: 05 Dec 2015 | Published: 31 Mar 2016 | Issue Date: March 2016

Abstract


For the first time, the continuous variation method was applied for the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite. Sorption of UO2(CH3COO)2⋅2H2O in the presence of Na2HPO4⋅7H2O from 0.001 mol/L solutions led to the appearance of maxima in the sorption peaks of U(VI) and P(V) ions at molar ratios of [U(VI)]/[P(V)]s = 1.4, 3.3, 3.6 and 1.2, 1.7. It is suggested, based on complementary XRD and XPS data, that the UO2HPO4 complex is located on aluminols (ºAl-OH) whereas the (UO2)3(PO4)2⋅4H2O complex is precipitated in the interlamellar space of bentonite. The participation of (UO2)3(OH)5+ and (UO2)4(OH)7+ species in the formation of U(VI) surface complexes is suggested, based on the deconvolution of sorption spectra of U(VI) on the bentonite in the presence of phosphates.


Keywords


Uranium; Bentonite; Phosphates; Job method; Sorption spectra; Uranyl phosphate complexes

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DOI: 10.5155/eurjchem.7.1.42-48.1348

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Funding information


European Regional Development Fund in the framework of the Operational Program Development of Eastern Poland 2007-2013 (Contract No. POPW 01.03.00-06-009/11-00)

Citations

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[1]. Dariusz Sternik, Agnieszka Gładysz-Płaska, Ewelina Grabias, Marek Majdan, Waldemar Knauer
A thermal, sorptive and spectral study of HDTMA-bentonite loaded with uranyl phosphate
Journal of Thermal Analysis and Calorimetry  129(3), 1277, 2017
DOI: 10.1007/s10973-017-6384-3
/


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How to cite


Grabias, E.; Gładysz-Płaska, A.; Lipke, A.; Pikus, S.; Majdan, M. Eur. J. Chem. 2016, 7(1), 42-48. doi:10.5155/eurjchem.7.1.42-48.1348
Grabias, E.; Gładysz-Płaska, A.; Lipke, A.; Pikus, S.; Majdan, M. Application of the de Job method in the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite. Eur. J. Chem. 2016, 7(1), 42-48. doi:10.5155/eurjchem.7.1.42-48.1348
Grabias, E., Gładysz-Płaska, A., Lipke, A., Pikus, S., & Majdan, M. (2016). Application of the de Job method in the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite. European Journal of Chemistry, 7(1), 42-48. doi:10.5155/eurjchem.7.1.42-48.1348
Grabias, Ewelina, Agnieszka Gładysz-Płaska, Agnieszka Lipke, Stanisław Pikus, & Marek Majdan. "Application of the de Job method in the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite." European Journal of Chemistry [Online], 7.1 (2016): 42-48. Web. 13 Apr. 2021
Grabias, Ewelina, Gładysz-Płaska, Agnieszka, Lipke, Agnieszka, Pikus, Stanisław, AND Majdan, Marek. "Application of the de Job method in the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite" European Journal of Chemistry [Online], Volume 7 Number 1 (31 March 2016)

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