Metal separation and recovery employing choline chloride-based deep eutectic solvents: Diverse functions of water

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL Separation and Purification Technology Pub Date : 2025-08-30 Epub Date: 2025-03-03 DOI:10.1016/j.seppur.2025.132341

Chaowu Wang , Xiaohui Lu , Rongrong Deng , Mengwei Guo , Mingyuan Gao , Juanjian Ru , Cunying Xu , Yixin Hua , Qibo Zhang

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Abstract

Deep eutectic solvents (DESs) are considered as environmentally friendly solvents for metal separation and extraction. Compared to aqueous solvents, DESs possess the characteristics of designability, recyclability, and stability; however, they also encounter significant challenges, such as high viscosity and cost constraints that limit their widespread application. The multifunctionality of water in regulating the solvent structure and phase behavior of DESs, modulating the form of metal ions in the system, enhancing efficient separation and recovery of metals, and facilitating the recycling of the solvent system is emphasized in this review. It comprehensively summarizes research progress on water’s roles as an additive, ligand modulator, and anti-solvent in choline chloride (ChCl)-based DESs processes for metal separation and extraction. Moreover, it highlights the pivotal role of water while discussing current research limitations by summarizing the challenges faced by water-modified ChCl-based DESs in metal resource recovery. Finally, future research directions are outlined to provide guidance for process improvement and the practical application of ChCl-based DESs.

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基于氯化胆碱的深共晶溶剂的金属分离和回收：水的多种功能

深共晶溶剂被认为是一种环境友好的金属分离萃取溶剂。与水溶剂相比，DESs具有可设计性、可回收性和稳定性等特点；然而，它们也面临着巨大的挑战，如高粘度和成本限制，限制了它们的广泛应用。综述了水在调节DESs溶剂结构和相行为、调节体系中金属离子形态、提高金属的高效分离和回收、促进溶剂体系循环利用等方面的多功能性。综述了水作为添加剂、配体调节剂和抗溶剂在氯化胆碱（ChCl）基DESs金属分离萃取工艺中的研究进展。此外，通过总结水改性chcl基DESs在金属资源回收中面临的挑战，讨论了当前研究的局限性，同时强调了水的关键作用。最后，对未来的研究方向进行了展望，为chcl基DESs的工艺改进和实际应用提供指导。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.