Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 43, Issue 9-10, Pages 2630-2640Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01496390802148811
Keywords
acidic media; N-donor; solvent extraction; TPEN
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Soft metals were extracted from acidic solution (pH 1 to 4) using two hydrophobic analogs of N,N,N',N'-tetrakis[2-pyridyl-methyl]-1,2-ethylenediamine (TPEN). N,N,N',N'-tetrakis[4-(2-butyloxy)-2-pyridyl-methyl]-1,2-ethylenediamine (TBPEN) and N,N,N',N'-tetrakis(2-quinolinylmethyl)-1,2-ethylenediamine (TQEN) have shown enhanced extraction performance in more acidic media than TPEN. TBPEN showed enhanced extraction of Cd(II) from highly acidic solutions (pH < 2). This is because the distribution of this ligand to the aqueous phase is suppressed by the formation of a metal complex encapsulating Cd(II) with TBPEN. The percent extraction of Cd(II) for TBPEN was 100% at pH 1, whereas TPEN extracts less than 10% of the Cd(II) under these conditions. TBPEN also exhibited selective extraction of a variety of soft metals, such as Au(III), Pt(II), Pd(II), and Cd(II), from the acidic solution at pH 1. These results suggest that a hydrophobic TPEN analog combining alkyl chains to four pyridyl groups is applicable to the practical extraction process of soft metals.
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