Journal
SOLVENT EXTRACTION AND ION EXCHANGE
Volume 25, Issue 4, Pages 503-513Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/07366290701415911
Keywords
Eu; solvent impregnated resin; rare earths; separation
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Eu(III) was selectively reduced to Eu(II) at three-dimensional glassy carbon cathode in 0.01 mol center dot dm(-3) hydrochloric acid medium. Eu(III) reduction took place after all the dissolved oxygen was reduced and then proceeded steadily. Separation of Eu(II) from trivalent rare earths (La, Ce, Sm, Gd, Er, Yb) was carried out using a novel impregnated resin based on bis(2- ethylhexy1) phosphoric acid. Eu(II) showed much lower affinity towards the resin than the trivalent rare earths and broke through the column readily. Eu of purity higher than 99.8% was yielded. The back-oxidation of Eu(II) was observed during the sorption and Eu(III) was absorbed onto the resin. Adsorbed light and middle rare earths could be stripped from the loaded resin by 3M hydrochloric acid. Stripping of heavy rare earths (Er, Yb) was problematic.
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