Abstract
The extraction of RE(III) (RE=La, Nd, Sm, Gd) in sulfuric acid medium using the mixture of HDEHP(H 2B 2) and HEH/EHP(H 2L 2) was investigated. The synergistic enhancement coefficient( R) was calculated for La (1.96), Nd(3.52), Sm(5.96), and Gd(5.71), respectively, at pH=2.0, and it was seen that the R increased with the increase of aqueous quilibrium pH. The configuration of the extracted complexes was considered to be RE(SO 4) x H 2 x (HB 2) 3 with HDEHP, RE(SO 4) x H 2 x (HL 2) 3 with HEH/EHP, and RE(HB 2) 2(HL 2) with their mixture as the extractant with the slope method. The equilibrium constants and stability constants were calculated. A cation exchange mechanism was proposed as well.
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