了解添加剂对柠檬酸基深度共晶溶剂浸出钴效率的影响

IF 2.5 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Isuri N. Perera, Jennifer M. Pringle, Luke A. O'Dell, Amal Siriwardana and Cristina Pozo-Gonzalo
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引用次数: 0

摘要

从二次资源中回收钴等关键金属是降低清洁能源技术所需金属供应风险的有效途径,但这种回收过程需要更加良性。因此,本研究提出了在温和条件下使用深共晶溶剂浸出钴的新见解。采用柠檬酸(CA)与氯化胆碱(ChCl)摩尔比为1:1的混合物,研究了乙二醇(EG)和水作为添加剂在钴浸出中的作用。虽然水浓度与Co浸出效率直接相关,但与EG含量无关。在混合物中加入较多的EG (CA: ChCl: EG从1:1:0.3到1:1:4摩尔比)降低了钴的浸出效率,这是由于EG以不同的配位形式存在,FTIR光谱显示。在最佳溶剂混合物CA: ChCl: EG(1:1: 1.1)下,钴酸锂氧化物(LiCoO2)在60°C下浸出48 h,钴和锂的浸出效率分别为43%和65%。虽然锂(I)是提高浸出效率的关键,但我们也观察到锂(I)在浸出液中的存在会对电化学还原过程产生负面影响。这可能是由于在存在和不存在锂(I)的情况下钴(II)的形态不同,如核磁共振光谱所示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Understanding the impact of additives on cobalt leaching efficiency using a citric acid-based deep eutectic solvent†

Understanding the impact of additives on cobalt leaching efficiency using a citric acid-based deep eutectic solvent†

Recovery of critical metals such as cobalt from secondary sources is an effective way to reduce the supply risk of metals that are necessary in clean energy technologies, but such recovery processes need to be more benign. Hence, this study presents new insights into leaching cobalt using deep eutectic solvents under mild conditions. The role of ethylene glycol (EG) and water as additives in cobalt leaching was investigated using a mixture containing citric acid (CA):choline chloride (ChCl) in 1 : 1 molar ratio. While the water concentration and Co leaching efficiency were directly related, that was not the case for the EG content. A larger amount of EG in the mixture (CA : ChCl : EG from 1 : 1 : 0.3 to 1 : 1 : 4 molar ratio) decreased the cobalt leaching efficiency, which was attributed to the presence of EG in different coordination forms, as suggested by FTIR spectroscopy. The optimal solvent mixture CA : ChCl : EG (1 : 1 : 1.1) led to leaching efficiencies of 43% cobalt and 65% lithium from lithium cobalt oxide (LiCoO2) at 60 °C for 48 h. Although lithium(I) was the key to increasing the leaching efficiency, we also observed that the presence of lithium(I) in the leachate could negatively impact the electrochemical reduction process. This may be due to the different speciation of cobalt(II) in the presence and absence of lithium(I), as indicated by NMR spectroscopy.

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来源期刊
New Journal of Chemistry
New Journal of Chemistry 化学-化学综合
CiteScore
5.30
自引率
6.10%
发文量
1832
审稿时长
2 months
期刊介绍: A journal for new directions in chemistry
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