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Solvent extraction studies of Sm(III) from nitrate medium and separation factors of rare earth elements with mixtures of sec ‐octylphenoxyacetic acid and 1,10‐phenthroline
Author(s) -
Fan Shujuan,
Song Naizhong,
Jia Qiong,
Liao Wuping
Publication year - 2010
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.2362
Subject(s) - samarium , yttrium , stoichiometry , lanthanide , extraction (chemistry) , chemistry , rare earth , equilibrium constant , analytical chemistry (journal) , inorganic chemistry , chromatography , ion , mineralogy , organic chemistry , oxide
BACKGROUND: Liquid–liquid extraction is widely used for the separation of rare earths, among which synergistic extraction has attracted more and more attention. Numerous types of synergistic extraction systems have been applied to rare earths with high extraction efficiency and selectivities. In the present study, mixtures of sec ‐octylphenoxyacetic acid (CA12, H 2 A 2 ) and 1,10‐phenanthroline (phen, B) have been used for the extraction of rare earths from nitrate medium. The stoichiometry of samarium(III) extraction has been studied using the methods of slope analysis and constant molar ratio. The possibility of using synergistic extraction effects to separate rare earths has also been studied. RESULTS: Mixtures of CA12 and phen display synergistic effects in the extraction of rare earth elements giving maximum enhancement coefficients of 5.5 (La); 13.7 (Nd); 15.9 (Sm); 24.5 (Tb); 45.4 (Yb) and 12.3 (Y). Samarium(III) is extracted as SmHA 4 B 3 with mixtures of CA12 and phen instead of SmHA 4 when extracted with CA12 alone. The calculated logarithm of the equilibrium constant is 6.0 and the thermodynamic functions, Δ H , Δ G , and Δ S , have been calculated as 4.3 kJ mol −1 , − 33.7 kJ mol −1 and 129.7 J mol −1 K −1 , respectively. CONCLUSION: Mixtures of CA12 and phen exhibit synergistic effects on rare earth elements. Graphical and numerical methods have been successfully used to determine their stoichiometries. The different synergistic effects may provide the possibility of separating yttrium from heavy lanthanoids at an appropriate ratio of CA12 and phen. Copyright © 2010 Society of Chemical Industry