Study on Cu(II) extraction process optimization and mechanism from acidic leaching solution using the deep eutectic solvent P507/Menthol

被引:2
作者
Chen, Jue [1 ,2 ]
Zhong, Hexiang [1 ]
Zhu, Shan [2 ]
机构
[1] Dalian Univ, Coll Environm & Chem Engn, Dalian 116622, Peoples R China
[2] Liupanshui Normal Univ, Sch Chem & Mat Engn, Liupanshui 553000, Peoples R China
关键词
Liquid extraction; Deep eutectic solvent Cupric complexes; Density functional theory; COMPLEXES;
D O I
10.1016/j.molliq.2024.123968
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, the selectivity of a hydrophobic deep eutectic solvent (HDES) comprising 2-ethylhexylphosphonic acid mono-(2-ethylhexyl) ester (P507) and L-menthol (Men) was assessed for the extraction and separation of Cu(II), Co(II), and Ni(II) from acidic leaching solutions, aiming to make the HDES system more consummate and provide a novel approach for metal extraction using HDES. The results indicated that under the conditions of a 2:1 M ratio of P507 to Men, an extraction temperature of 40celcius, an extraction time of 40 min, an oil-water ratio(O/W, v/v) of 1, and a pH value of 4, the three-stage cross-flow extraction efficiency of the HDES for Cu(II) was over 99 %. Furthermore, successful selective separation of Cu(II), Ni(II), and Co(II) was demonstrated by separation coefficients beta(Cu/Ni) of 2150 and beta(Cu/Co) of 305. Molecular dynamics (MD) simulations and density functional theory (DFT) indicated that the formation of an HDES molecule involved the combination of two molecules of P507 and one molecule of Men through hydrogen bonding interactions. Moreover, compared to other cupric complex configurations, the tetrahedral cupric complex, synthesized using two molecules of P507 and two molecules of menthol with Cu(II), exhibited a lower single-point energy and a higher Delta E(LUMO-HOMO), demonstrating greater stability.
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页数:11
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