Efficient separation of Pd(II) from HCl media by bifunctional thiomorpholinium-based ionic liquids

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2025-04-08 DOI:10.1002/aic.18843

Qing Liu, Wanru Wang, Ming Yi, Weichi Chen, Kewen Tang

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引用次数: 0

Abstract

Bifunctional thiomorpholinium-based ionic liquids were synthesized for the efficient separation of Pd(II) in HCl media. The presence of S atoms in the six-membered ring facilitated the efficient extraction of Pd(II), with a remarkable extraction capacity of 212 mg/g. The extraction mechanism involved anion exchange and coordination. Specifically, PdCl₄²⁻ preferentially combined with positive N atoms in the thiomorpholinium ring through anion exchange by electrostatic attraction, followed by coordination with the functional sulfur atom to form a stable extracted complex. In addition, the effect of the carbon chain length of the cationic substituent on the extraction performance was systematically investigated to further reveal the structure–activity relationship. More importantly, N,N-dihexyl-thiomorpholinium bis(trifluoromethylsulfonyl)imide exhibited excellent Pd(II) selectivity and reusability, retaining 99.4% extraction efficiency after five extraction-stripping cycles. This study guides the design of ionic liquids-based extractants and offers a solvent-free method for the efficient and environmentally friendly separation of Pd(II).

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利用双功能硫代吗啉基离子液体从盐酸介质中高效分离 Pd(II)

为在盐酸介质中高效分离钯（II），合成了双功能硫代吗啉基离子液体。六元环中 S 原子的存在促进了钯(II)的高效萃取，萃取能力高达 212 mg/g。萃取机制涉及阴离子交换和配位。具体来说，PdCl42- 在静电吸引作用下通过阴离子交换优先与硫代吗啉环中的正 N 原子结合，然后与功能性硫原子配位形成稳定的萃取复合物。此外，还系统研究了阳离子取代基的碳链长度对萃取性能的影响，以进一步揭示其结构-活性关系。更重要的是，N,N-二己基-硫代吗啉鎓双(三氟甲基磺酰基)亚胺表现出优异的钯(II)选择性和重复利用率，在五个萃取-剥离循环后仍能保持 99.4% 的萃取效率。这项研究为基于离子液体的萃取剂的设计提供了指导，并为高效、环保地分离钯（II）提供了一种无溶剂方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

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