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Fatty acid methyl esters (FAME) derived from catfish oil, were investigated for its potentiality as friendly substitute for commercial petroleum-based organic diluents to extract Co(II) over Li(I) from the simulated leaching solution using tris-2-ethylhexylamine (TEHA). The results showed that TEHA-in-FAME diluent exhibited higher extraction efficiency of Co(II) and higher separation factor of Co(II) and Li(I) compared to the commercial diluents including kerosene, toluene, and hexane. About 97% of Co (II) from the simulated leaching solution containing Li(I) were obtained in counter-current extraction and stripping experiments by TEHA-in-FAME using dilute HCl solutions. The extraction capacity of the regenerated TEHA-in-FAME was almost unchanged after five recycling stages of extraction and stripping processes, indicating that FAME was an effective diluent for replacement of the commercial diluents.

separation science and technology

Fatty acid methyl esters from catfish oil as a potential diluent for separation of Co(II) and Li(I) from spent lithium-ion batteries by solvent extraction