Application of hydrophobic extractant in aqueous two-phase systems for selective extraction of cobalt, nickel and cadmium

作者：Rodrigues Guilherme Dias; de Lemos Leandro Rodrigues; Mendes da Silva Luis Henrique; Hespanhol da Silva Maria C

来源：Journal of Chromatography A, 2013, 1279: 13-19.

DOI：10.1016/j.chroma.2013.01.003

• Cobalt
• Nickel
• Cadmium
• Aqueous two-phase system
• Hydrophobic extractant

This work developed a new and efficient method of extracting and separating Co(II), Ni(II) and Cd(II) in aqueous two-phase systems (ATPS) composed of triblock copolymer (L64) + Na2C4H4O6 + water and L64 + Li2SO4 + water using the hydrophobic extractant 1-nitroso-2-naphtol, which complexes the metal ions and partitions in the triblock copolymer micelles in the ATPS top phase. Metal extraction from the salt-rich phase to the copolymer - rich phase is strongly affected by the fine-tuning of the following parameters: amount of added extractant, type of electrolyte, pH, and tie-line length. Excellent separation factors (S-ij) between the metals were obtained at pH = 3.00 (S-Co,S-Cd = 1550 and S-Ni,S-Cd = 16,700) and pH = 1.00 (S-Co,S-Ni; = 826). In the interference study, Co(II) was selectivity extracted in the top phase in the presence of Ni(II) and Cd(II) in a concentration of up to 20 times the cobalt level in the system.

• 出版日期2013-3-1