Application of Ionic Liquids on Rare Earth Green Separation and Utilization by Ji Chen

Author:Ji Chen
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

A

B

C

D

E

r 2

Nd(III)

−66.840

59.520

29.141

−22.568

51.665

0.970

Dy(III)

−63.178

55.183

25.713

−18.523

52.146

0.841

Fig. 6.3Arrhenius plots for the molar fraction solubility x of Nd(III) and Dy(III) in [P2225][TFSA] and the theoretical curves by modified Apelblat equation. ○: Nd(III) and ●: Dy(III) (Reprinted with permission from Ref. [21] Copyright 2013, Elsevier Science)

The temperature dependence of the solubility curves of Nd(III) and Dy(III) displayed an analogous tendency. Free energy evaluation is the most reliable theoretical method for systematic studies of solvation properties [24, 25]. The thermodynamic properties characterizing the solvating process of the IL were derived from the temperature dependence of the solubility using Eq. (6.1):

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