Selective Extraction Equilibria of Sc(Ⅲ), Y(Ⅲ), Fe(Ⅲ) and Al(Ⅲ) from Acidic Media with Toluene Mixture of Deep Eutectic Solvent(DES) Composed of TOPO and isostearic Acid
Selective Extraction Equilibria of Sc(Ⅲ), Y(Ⅲ), Fe(Ⅲ) and Al(Ⅲ) from Acidic Media with Toluene Mixture of Deep Eutectic Solvent(DES) Composed of TOPO and isostearic Acid
复制标题
TOPO与异硬脂酸低共熔溶剂(DES)的甲苯混合物在酸性介质中选择性萃取Sc(Ⅲ)、Y(Ⅲ)、Fe(Ⅲ)和Al(Ⅲ)的平衡
DOI：
10.1007/s44211-022-00234-z
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Yoshinari BABA
中科院分区：
文献类型：
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作者：
Sora USHIZAKI;Shintaro KANEMARU;Kazuhiro SUGAMOTO;Yoshinari BABA
新发现并研究了一种由异硬脂酸和 TOPO 组成的低共熔溶剂 (DES)，用于选择性回收钪。本研究中使用的四种元素是钪、铁、钇和铝。当分别使用异硬脂酸或单独使用甲苯中的 TOPO 时，由于萃取行为的重叠，很难分离四种元素。然而，使用由 1:1 摩尔比的异硬脂酸和 TOPO 制备的 DES（不含甲苯），可以选择性地从其他金属中提取钪。在由异硬脂酸和TOPO组成的DES中，三种萃取剂的协同和阻断作用影响了钪的萃取选择性。钪很容易被稀释的酸性溶液（例如 2 M HCl 和 H2SO4）剥离，这一事实也证明了这两种效果。因此，DES 选择性萃取钪，并且很容易实现反萃取。为了阐明上述现象，详细研究了使用溶解在甲苯中的 DES 的 Sc(III) 萃取平衡。 DES在甲苯中萃取钪的机理表明，萃取的化学物质随pH变化而变化，三价钪是通过与由五分子异硬脂酸和五分子TOPO组成的DES形成稳定的金属络合物来萃取的。 图解摘要
A deep eutectic solvent (DES) composed of isostearic acid and TOPO was newly found out and investigated for selective recovery of scandium. The four elements used in this study are scandium, iron, yttrium, and aluminum. It was difficult to separate the four elements owing to the overlap of extraction behavior when isostearic acid or TOPO alone in toluene was used, respectively. However, scandium was able to be selectively extracted from other metals using DES prepared by 1:1 mol ratio of isostearic acid and TOPO without toluene. In DES consisting of isostearic acid and TOPO, synergistic and blocking effects with three extractants acted on the extraction selectivity for scandium. Both effects are proved also from the fact that scandium was easily stripped with diluted acidic solutions such as 2 M HCl and H2SO4. Thus, DES extracted selectively scandium and back-extraction was easily achieved. In order to elucidate these phenomena above, the extraction equilibria of Sc(III) using DES dissolved in toluene was investigated in detail. The extraction mechanism of scandium by DES in toluene indicates that the extracted chemical species vary with pH, and that trivalent scandium is extracted by forming stable metal complexes with DESs consisting of five molecules of isostearic acid and five molecules of TOPO.Graphical abstract