Abstract
The extraction behavior of scandium ion (Sc3+) was investigated using 1-butyl-3-methyl -imidazolium hexafluorophosphate ([Bmim]PF6) ionic liquid as extraction solvent and 2-ethylhexyl phosphonic acid-2-ethylhexyl ester (P507, HA) as extractant. The extractablity of Sc3+ using [Bmim]PF6 was less than 5% without P507. When the initial P507 concentration in IL phase was 0.2 mol/L, percentage extraction of 5×10-5 mol·L-1 Sc3+ exceeded 99%. The results showed that the extracted species in the Sc3+-P507-[Bmim]PF6 system was neutral ScA3 and [Bmim]PF6 solvent could be used repeatedly.
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