

Application of the de Job method in the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite
Ewelina Grabias (1)





(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.
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European Journal of Chemistry
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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
[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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DOI Link: https://doi.org/10.5155/eurjchem.7.1.42-48.1348

















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