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Solvent Extraction of Iron(III) from Chloride Media by N-Methyl-N-alkyloctanamide Derivatives

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N-methyl-N-cyclohexyloctanamide (MCHOA) and N-methyl-N-phenyloctanamide (MPHOA) were synthesized, characterized, and tested to recover iron(III) from chloride media. Both compounds efficiently extract Fe(III) from HCl solutions above 4 M, although a decrease in extraction at 10 M HCl, involving MCHOA, is noticed. Stripping of Fe(III) by water may be easily and efficiently achieved. Results on the re-utilization of the organic phases are also presented. Preliminary selectivity experiments point out to a rather good performance of both compounds towards Fe(III) when in the presence of Cu(II), Ni(II), and Zn(II). Assuming that the extractants are under a monomeric form, average species such as [image omitted] (L, MCHOA or MPHOA) are proposed as being involved on Fe(III) extraction from 6 M HCl solutions.

Keywords: Amide derivatives; Fe(III) extraction; chloride media

Document Type: Research Article


Affiliations: Centro de Quimica e Bioquimica, Departamento de Quimica e Bioquimica da Faculdade de Ciencias da Universidade de Lisboa (DQB-FCUL), Lisboa-Portugal

Publication date: September 1, 2009

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