期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 193, 期 -, 页码 311-318出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2011.07.062
关键词
Aqueous two-phase systems; Liquid-liquid extraction without organic solvent; Cobalt; Iron; Nickel
资金
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Institut Nacional de Ciencias e Tecnologias Analiticas Avancadas (INCTAA)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
We have investigated the extraction behavior of the metallic ions Co(II), Fe(III) and Ni(II) as a function of the amount of potassium thiocyanate used as an extracting agent, using the following aqueous two-phase systems (AIRS): PEO + (NH4)(2)SO4 + H2O, PEO + Li2SO4 + H2O, L35 + (NH4)(2)SO4 + H2O and L35 +(Li)(2)SO4 + H2O. Metal extraction from the salt-rich phase to the polymer-rich phase is affected by the following parameters: amount of added extractant, pH, and the nature of the electrolyte and polymer that forms the ATPS. Maximal extraction percentages were obtained for Co(II) (99.8%), Fe(III) (12.7%) and Ni(II) (3.17%) when the ATPS was composed of PEO1500 + (NH4)(2)SO4 + H2O containing 1.4 mmol of KSCN at pH 4.0, providing separation factors as high as S-Co,S-Fe = 3440 and S-Co,S-Ni = 15,300. However, when the same ATPS was used at pH 2.0, the maximal extraction percentages for iron and nickel were 99.5% and 4.34%, respectively, with S-Fe,S-Ni equal to 4380. The proposed technique was shown to be efficient in the extraction of Co(II) and Fe(III), with large viability for the selective separation of Co(I I) and Fe(III) ions in the presence of Ni(II). (C) 2011 Elsevier B.V. All rights reserved.
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