Extraction of lanthanide ions from acidic and strongly acidic media by phosphine oxide derivatives using temperature-induced phase separation |
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| Authors: | Yu G Elistratova A R Mustafina D A Tatarinov V F Mironov V A Burilov I G Tananaev A I Konovalov |
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| Institution: | 1.A. E. Arbuzov Institute of Organic and Physical Chemistry,Kazan Scientific Center of the Russian Academy of Sciences,Kazan,Russian Federation;2.A. N. Frumkin Institute of Physical Chemistry and Electrochemistry,Russian Academy of Sciences,Moscow,Russian Federation |
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| Abstract: | A composite for the extraction of lanthanide ions from strongly acidic media by temperature-induced phase separation was designed
based on the nonionic surfactant Triton X-100 and new phosphine oxide derivatives. The dependence of the efficiency and selectivity
of micellar extraction on the length of the hydrophobic substituent at the P=O group is determined by both the influence of
hydrophobic substituents on the electron-donor capacity of the P=O group and the solubility of phosphine oxides in aqueous
and micellar phases. The nitric acid concentration was found to influence the efficiency of extraction of lanthanide ions
by phosphine oxides with different structures. An increase in the concentration of nitric acid in an aqueous medium from 0.1
to 1 mol L−1 leads to a decrease in the degree of extraction by water-soluble derivatives and a substantial increase in the degree of
extraction by phosphine oxides, which are soluble only in the micellar phase of Triton X-100. |
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