Synergistic Effects in Extraction and Separation of Praseodymium(III) and Neodymium(III) with 8-Hydroxyquinoline in the Presence of 2-Ethylhexyl Phosphonic Acid Mono-2-Ethylhexyl Ester

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• 作者：Dongbei Wu ; Qian Zhang ; Borong Bao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：September 12, 2007
• 年：2007
• 卷：46
• 期：19
• 页码：6320 - 6325
• 全文大小：86K
• 年卷期：v.46,no.19(September 12, 2007)
• ISSN：1520-5045

文摘

In this paper, the extraction behaviors of praseodymium(III) from an aqueous chloride-acetate medium,using 8-hydroxyquinoline (HQ), 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507, HL) and theirmixture, were studied, using ultraviolet-visible light (UV-vis) absorption spectroscopy. The binary equilibriumconstants (log K₁, log K₂) for the complex formation PrL₃·3HL and PrQ₃ in the organic phase were determinedto be -1.98 for 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester and -11.54 for HQ, respectively. Theoverall equilibrium constant (log K₁₂) for the ternary species PrQ₂L₁₀H₉ was estimated to be 6.01. The largestsynergistic enhancement factor was calculated to be 5.39, corresponding to a HQ:P507 concentration ratio of3:7 at pH 3.6. When P507 was added into HQ, the entire stripping could be achieved at an aqueous sulfuricacid concentration of ~0.02 M. In addition, for praseodymium(III) and neodymium(III), the mixture of HQand P507 showed higher separation selectivity than HQ or P507 alone, which is important for potential industrialapplications.