Highly selective deep eutectic solvents for the recovery of lithium from high sodium concentration aqueous solutions

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL AIChE Journal Pub Date : 2025-01-07 DOI:10.1002/aic.18679

Ke Xue, Hai Liu, Peng Kou, Yan Zhou, Yan Zhang, Zhaoyou Zhu, Jianguang Qi, Yinglong Wang

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Abstract

Efficient and selective extraction of lithium from sodium-rich systems is crucial for meeting the growing demand for lithium and achieving green development goals. In this study, we synthesized three hydrophobic deep eutectic solvents (HDES) using trioctylphosphine oxide and β-diketones for the separation of alkali metal ions. Experimental results indicated that the chosen extractants exhibit excellent Li⁺ extraction capability under alkaline conditions, and the extraction capacity of HDES for Li⁺ is superior to that of their components. Thermodynamic function calculations revealed that the Li⁺ extraction reaction is exothermic. A study of the factors affecting Li⁺ extraction efficiency and separation coefficients, and the recyclability of HDES, was conducted, achieving efficient recovery of lithium from solutions. Additionally, Fourier-transform infrared spectroscopy analysis and quantum chemical calculations elucidated the extraction mechanism. This study aims to provide a theoretical basis and a green approach for the selective recovery of Li⁺ from high Na/Li aqueous solutions.

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从高钠浓度水溶液中回收锂的高选择性深共晶溶剂

从富钠系统中高效、选择性地提取锂对于满足日益增长的锂需求和实现绿色发展目标至关重要。在本研究中，我们用氧化三辛基膦和β-二酮合成了三种疏水深共晶溶剂（HDES），用于碱金属离子的分离。实验结果表明，所选择的萃取剂在碱性条件下具有良好的Li+萃取能力，HDES对Li+的萃取能力优于其组份。热力学函数计算表明，Li+萃取反应为放热反应。研究了影响锂离子萃取效率、分离系数以及HDES可回收性的因素，实现了溶液中锂的高效回收。此外，傅里叶变换红外光谱分析和量子化学计算阐明了萃取机理。本研究旨在为从高Na/Li水溶液中选择性回收Li+提供理论依据和绿色途径。

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

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.