Extraction of lanthanide nitrates with trioctylmethylammonium di(2,4,4-trimethylpentyl)phosphinate |
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| Authors: | A. I. Khol’kin A. K. Pyartman V. V. Belova N. S. Egorova V. A. Keskinov |
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| Affiliation: | (1) Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russia;(2) St. Petersburg State Institute of Technology (Technical University), St. Petersburg, Russia |
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| Abstract: | A binary extractant based on trioctylmethylammonium di(2,4,4-trimethylpentyl)phosphinate R4NA was prepared. The extraction of lanthanide (Gd-Lu) nitrates from aqueous solutions with 0.6 M toluene solutions of R4NA and trioctylmethylammonium nitrate was studied. The extraction isotherms of lanthanide nitrates with these extractants were obtained and physicochemical and mathematical models of extraction of lanthanides were developed. The extraction isotherms with the binary extractant were analyzed assuming that the Ln(III) extractable complexes LnA3, (R4N)2[Ln(NO3)5], (R4N)3[Ln(NO3)6], (R4N)2[Ln(NO3)3A2], and (R4N)[Ln(NO3)3A] [A is di(2,4,4-trimethylpentyl)phosphinate anion] are formed in the organic phase. The extraction constants were calculated. |
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