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Selective recoveries of Fe(III) and Cr(III) from a tannery filtrate using Cyanex 923 by Akash Deep; Paulo F.M. Correia; Jorge M.R. Carvalho is a Chemistry article available to read on EtoBox.

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The separation of Fe(III) and Cr(III) has been proposed by liquid-liquid extraction with 0.50 M Cyanex 923. Fe(III) was selectively extracted from the mixed H 2 SO 4 and NaCl medium leaving pure Cr(III) in the raffinate. The developed method has been used to separate and recover Fe(III) and Cr(III) from a tannery filtrate. The modeling experiments, simulating the concentration of Fe(III) and H 2 SO 4 in the original tannery filtrate, have suggested the presence of the metal ion predominantly in the form of FeHSO 4 2+ . The addition of Cl -ions in the aqueous phase resulted into the development of FeCl 3 , which was extractable in Cyanex 923 by solvation with two extractant molecules. The kinetics of the extraction was reasonably fast. The stripping of Fe(III) has been carried out by 0.25 M H 2 SO 4 . The extractant solution maintained its capacity even after repeated extraction and stripping cycles.

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Author

Akash Deep; Paulo F.M. Correia; Jorge M.R. Carvalho

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

2006

Language

EN

Field

Chemistry (Physical Sciences)