Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/13277
Tipo: Artigo
Título: Application of aqueous two-phase systems for the development of a new method of cobalt(II), iron(III) and nickel(II) extraction: A green chemistry approach
Autor(es): Patrício, Pamela da Rocha
Mesquita, Maiby Cabral
Silva, Luis Henrique Mendes da
Silva, Maria C. Hespanhol da
Abstract: 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 aque-ous two-phase systems (ATPS): PEO + (NH 4 ) 2 SO 4 + H 2 O, PEO + Li 2 SO 4 + H 2 O, L35 + (NH 4 ) 2 SO 4 + H 2 O and L35 + (Li) 2 SO 4 + H 2 O. 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 + (NH 4 ) 2 SO 4 + H 2 O containing 1.4 mmol of KSCN at pH 4.0, providing separation factors as high as S Co,Fe = 3440 and S Co,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,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(II) and Fe(III) ions in the presence of Ni(II).
Palavras-chave: Aqueous two-phase systems
Liquid–liquid extraction without organic
Solvent
Cobalt
Iron
Nickel
Editor: Journal of Hazardous Materials
Tipo de Acesso: Open Access
URI: https://doi.org/10.1016/j.jhazmat.2011.07.062
http://www.locus.ufv.br/handle/123456789/13277
Data do documento: 15-Out-2011
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