Application of the de Job method in the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite | European Journal of Chemistry

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Published: Mar 31, 2016

DOI: https://doi.org/10.5155/eurjchem.7.1.42-48.1348

Keywords:

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

Section

Research Article

Issue

Vol. 7 No. 1 (2016): March 2016

Dates

Received 2015-10-23
Accepted 2015-12-05
Published 2016-03-31

Ewelina Grabias

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Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland

Agnieszka Gładysz-Płaska

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Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland

Agnieszka Lipke

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Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland

Stanisław Pikus

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Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland

Marek Majdan

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Maria Curie Skłodowska University, Faculty of Chemistry, 20-031 Lublin, PL MC Skłodowskiej 3, Poland

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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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, 42-48.

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Supporting Agencies

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)

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