Separation of cobalt and nickel by hydrophobic deep eutectic solvents based on quaternary ammonium salt and alcohols

化学工业与工程

Chemcial Industry and Engineering

2023, Vol. 40

Issue (2) :67-74 DOI: 10.13353/j.issn.1004.9533.20216005

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Separation of cobalt and nickel by hydrophobic deep eutectic solvents based on quaternary ammonium salt and alcohols

HE Xihong¹, XIAO Haifeng¹, LI Linbo^1,2

1. School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. Shaanxi Engineering Research Center of Metallurgy, Xi'an 710055, China

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Abstract Hydrophobic deep eutectic solvent (HDES) is a new type of green solvent with low cost, low vapour pressure, simple synthesis and other advantages. Using Aliquat 336 as hydrogen bond acceptor and hexyl alcohol, capryl alcohol, decyl alcohol, dodecyl alcohol, myristyl alcohol as hydrogen bond donor, respectively, five HDES were prepared for the extraction and separation of Co(Ⅱ) and Ni(Ⅱ). The effects of Cl^- concentration, acidity and temperature were investigated, the stripping behavior of Co(Ⅱ) was studied, and the extraction mechanism of Co(Ⅱ) by HDES was studied by ultraviolet-visible spectroscopy and Fourier transform infrared spectroscopy. The results show that the separation performance of Co(Ⅱ) and Ni(Ⅱ) can be improved by increasing Cl^- concentration, increasing temperature and decreasing acidity. Compared with different HDESs, the distribution ratios of Co(Ⅱ) and Ni(Ⅱ) decreased slightly with the increase of alkyl chain length in hydrogen bond donor, and the separation factors remained unchanged. The Co(Ⅱ) can be stripped from the HDESs phase with 1 mol·L^-1 Na₂SO₄ solution, and the stripping percentage reached 99.5% by two times of stripping. The extraction mechanism of Co(Ⅱ) by five HDESs is the same which accords with anion exchange.

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	HE Xihong
	XIAO Haifeng
	LI Linbo

Keywords： hydrophobic deep eutectic solvent extraction Co/Ni separation hydrogen bond donor

Received 2021-11-18;

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HE Xihong, XIAO Haifeng, LI Linbo.Separation of cobalt and nickel by hydrophobic deep eutectic solvents based on quaternary ammonium salt and alcohols[J] Chemcial Industry and Engineering, 2023,V40(2): 67-74

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