Comprehensive extraction study using N,N-dioctylthiodiglycolamic acid: effect of S donor on metal extraction

IF 1.8 4区化学 Q3 CHEMISTRY, ANALYTICAL

Analytical Sciences Pub Date : 2024-05-16 DOI:10.1007/s44211-024-00577-9

Kojiro Shimojo, Iori Fujiwara, Takumi Saito, Tatsuya Oshima

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Abstract

Extraction ability of N,N-dioctylthiodiglycolamic acid (T-DODGAA), a soft-base sulfur donor ligand with an amide group and a carboxylic acid connected by a thioether chain, for 56 metal ions have been comprehensively investigated and compared with that of N,N-dioctyldiglycolamic acid (DODGAA) with an etheric oxygen atom, a hard-base donor. The acid dissociation constant (pK_a) of the thiodiglycolamic acid framework was determined to be 3.71 ± 0.06 in water (0.1 M LiCl, 25 °C) by potentiometric titration, indicating that T-DODGAA is a slightly weaker acid than DODGAA (pK_a = 3.54 ± 0.03). T-DODGAA can quantitatively extract various metal ions from the 56 metal ions into the organic phase (isooctane) through a proton-exchange reaction. T-DODGAA provided higher extraction performance than DODGAA for Hf(IV), Cr(III), Fe(III), Ni(II), Cu(II), Pd(II), Ag(I), Au(III), Hg(II), Al(III), and Ga(III), especially for soft metal ions. Furthermore, to demonstrate the practical feasibility of T-DODGAA for hydrometallurgy and metal recycling, we performed selective separation tests of rare metal ions such as Sc(III), Ni(II), Co(II), Pd(II), Au(III), In(III), and Ga(III) in metal-mixed extraction systems.

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使用 N,N-二辛基硫代二甘醇氨基甲酸酯进行综合萃取研究：S 供体对金属萃取的影响。

本研究全面考察了N,N-二辛基硫代二甘醇氨基甲酸酯（T-DODGAA）对56种金属离子的萃取能力，并将其与带有一个乙醚氧原子的N,N-二辛基二甘醇氨基甲酸酯（DODGAA）（一种软碱硫供体配体，由硫醚链连接一个酰胺基团和一个羧酸）的萃取能力进行了比较。通过电位滴定法测定了硫代二甘醇胺酸框架在水中（0.1 M LiCl，25 °C）的酸解离常数（pKa）为 3.71 ± 0.06，表明 T-DODGAA 是一种比 DODGAA（pKa = 3.54 ± 0.03）稍弱的酸。通过质子交换反应，T-DODGAA 可以定量地将 56 种金属离子萃取到有机相（异辛烷）中。与 DODGAA 相比，T-DODGAA 对 Hf(IV)、Cr(III)、Fe(III)、Ni(II)、Cu(II)、Pd(II)、Ag(I)、Au(III)、Hg(II)、Al(III)和 Ga(III) 具有更高的萃取性能，尤其是对软金属离子。此外，为了证明 T-DODGAA 在湿法冶金和金属回收方面的实际可行性，我们在金属混合萃取系统中对 Sc(III)、Ni(II)、Co(II)、Pd(II)、Au(III)、In(III) 和 Ga(III) 等稀有金属离子进行了选择性分离试验。

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来源期刊

Analytical Sciences 化学-分析化学

CiteScore

2.90

自引率

18.80%

发文量

232

审稿时长

1 months

期刊介绍： Analytical Sciences is an international journal published monthly by The Japan Society for Analytical Chemistry. The journal publishes papers on all aspects of the theory and practice of analytical sciences, including fundamental and applied, inorganic and organic, wet chemical and instrumental methods. This publication is supported in part by the Grant-in-Aid for Publication of Scientific Research Result of the Japanese Ministry of Education, Culture, Sports, Science and Technology.