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oai:ojs.www.eurjchem.com:article/1348 2016-03-31T05:10:15Z eurjchem:ART driver

Application of the de Job method in the evaluation of the stoichiometry of uranyl phosphate complexes sorbed on bentonite Grabias, Ewelina Gładysz-Płaska, Agnieszka Lipke, Agnieszka Pikus, Stanisław Majdan, Marek Uranium Bentonite Phosphates Job method Sorption spectra Uranyl phosphate complexes 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. Atlanta Publishing House LLC 2016-03-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/1348 10.5155/eurjchem.7.1.42-48.1348 European Journal of Chemistry; Vol. 7 No. 1 (2016): March 2016; 42-48 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/1348/pdf_1348