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Enhanced separation of Pd(II) and Pt(IV) from hydrochloric acid aqueous solution using 2-((2-methoxyethyl)thio)-1H-benzimidazole
Rare Metals ( IF 9.6 ) Pub Date : 2020-09-03 , DOI: 10.1007/s12598-020-01545-8
Shao-Ping Feng , Kun Huang

Abstract Separation of palladium (Pd) and platinum (Pt) by solvent extraction is difficult because of their extremely similar physicochemical properties. Development of new extractants with a high extraction efficiency and excellent separation selectivity is the primary focus for enhancing the separation of Pd and Pt by solvent extraction. In this study, a new extractant, 2-((2-methoxyethyl)thio)-1H-benzimidazole (MOBI), which contains N, S, and O atoms, was synthesized and used to separate Pd(II) and Pt(IV) from a hydrochloric acid aqueous solution. The experimental results revealed that Pd(II) and Pt(IV) were effectively separated under the optimal conditions: MOBI concentration of 0.005 mol·L −1 , HCl concentration of 0.2 mol·L −1 , organic/aqueous (O/A) phase ratio of 1.0, and contact time of 15 min. The separation coefficient between Pd(II) and Pt(IV) was 1246.40, which indicates that MOBI has a higher selectivity for Pd(II) than Pt(IV). In addition, the mechanism of coordination between Pd(II) and MOBI was demonstrated through the slope method, Fourier transform infrared spectroscopy (FTIR), hydrogen-1 nuclear magnetic resonance spectroscopy ( 1 H NMR), and carbon-13 nuclear magnetic resonance spectroscopy ( 13 C NMR). The results revealed that MOBI could coordinate with Pd(II) via the N atom in the benzimidazole ring of MOBI molecules to form [Pd(MOBI) 2 Cl 2 ] (O) . Graphic abstract

中文翻译:

使用 2-((2-甲氧基乙基) 硫代)-1H-苯并咪唑增强盐酸水溶液中 Pd(II) 和 Pt(IV) 的分离

摘要 钯 (Pd) 和铂 (Pt) 的物理化学性质极其相似,因此很难通过溶剂萃取分离它们。开发具有高萃取效率和优异分离选择性的新型萃取剂是通过溶剂萃取增强 Pd 和 Pt 分离的主要焦点。在本研究中,合成了一种含有 N、S 和 O 原子的新型萃取剂 2-((2-甲氧基乙基) 硫代)-1H-苯并咪唑 (MOBI),用于分离 Pd(II) 和 Pt(IV)。 ) 来自盐酸水溶液。实验结果表明,Pd(II)和Pt(IV)在最佳条件下得到有效分离:MOBI浓度为0.005 mol·L -1 ,HCl浓度为0.2 mol·L -1 ,有机/水相(O/A)相比为 1.0,接触时间为 15 分钟。Pd(II) 和 Pt(IV) 之间的分离系数为 1246.40,这表明 MOBI 对 Pd(II) 的选择性高于 Pt(IV)。此外,通过斜率法、傅里叶变换红外光谱(FTIR)、氢一核磁共振光谱( 1 H NMR)和碳13核磁共振光谱证明了Pd(II)和MOBI之间的配位机制( 13 C NMR)。结果表明,MOBI可以通过MOBI分子苯并咪唑环中的N原子与Pd(II)配位形成[Pd(MOBI) 2 Cl 2 ] (O) 。图形摘要 氢 1 核磁共振波谱( 1 H NMR)和碳 13 核磁共振波谱( 13 C NMR)。结果表明,MOBI可以通过MOBI分子苯并咪唑环中的N原子与Pd(II)配位形成[Pd(MOBI) 2 Cl 2 ] (O) 。图形摘要 氢 1 核磁共振波谱( 1 H NMR)和碳 13 核磁共振波谱( 13 C NMR)。结果表明,MOBI可以通过MOBI分子苯并咪唑环中的N原子与Pd(II)配位形成[Pd(MOBI) 2 Cl 2 ] (O) 。图形摘要
更新日期:2020-09-03
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