Solvent extraction of certain rare earth metal ions with 1-(2-pyridylazo)-2-naphthol (PAN)—I Extraction of dysprosium(III) and ytterbium(III) by PAN from aqueous solutions

Journal of Inorganic and Nuclear Chemistry Pub Date : 1981-01-01 DOI:10.1016/0022-1902(81)80116-9

B. Kuźnik

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引用次数: 20

Abstract

The solvent extraction of certain heavy lanthanides (dysprosium and ytterbium) by 1-(2-pyridylazo)-2-naphthol (PAN or HL) in carbon tetrachloride has been studied as a function of contact time, the pH of the aqueous phase, the concentration of the extractant in the organic phase and the influence of solvents. The data suggest that the equation for the extraction reaction is $Ln^{3+}_{(aq)} +3HL_{(0)} ⇌LnL_{3(0)} +3H^{+}_{(aq)} (where Ln^{3+} =Dy, Yb).$

From the distribution coefficient D, extraction equilibrium constants (K_ex of reaction, two-phase stability constants (β₃^x) for the LnL₃ complexes, pH_0.5, and separation factor (S_Yb/Dy) have been evaluated.

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1-(2-吡啶偶氮)-2-萘酚(PAN)萃取某些稀土金属离子- PAN从水溶液中萃取镝(III)和镱(III)

研究了1-(2-吡啶偶氮)-2-萘酚(PAN或HL)在四氯化碳中萃取某些重镧系元素(镝和镱)的过程，考察了萃取时间、水相pH、有机相萃取剂浓度和溶剂的影响。结果表明，萃取反应的方程为Ln3+(aq)+3HL(0) + LnL3(0)+3H+(aq)(其中Ln3+=Dy, Yb)。根据分配系数D，计算了LnL3配合物的萃取平衡常数(Kex)、两相稳定常数(β3x)、pH0.5和分离因子(SYb/Dy)。

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Journal of Inorganic and Nuclear Chemistry

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