Lead(II) extraction from aqueous solutions by pyridine extractants

Publication date: 28 April 2017
Source:Separation and Purification Technology, Volume 177
Author(s): Aleksandra Wojciechowska, Karolina Wieszczycka, Irmina Wojciechowska, Andrzej Olszanowski
In this work, the Pb(II) extraction from chloride and chloride/nitrate solution with novel hydrophobic extractants: 1-(3-pyridyl)undecan-1-one oxime and its pyridinium salts (3-[1-(hydroxyimine)undecyl]-1-propylpyridinium bromide and 3-[1-(hydroxyimine)undecyl]-1-propylpyridinium chloride) was discussed. The extraction efficiency strongly depended on chloride and extractant concentration, as well as the extractant structure. The conducted calculations indicated that lead(II) was extracted as PbCl3⁻ and PbCl4²⁻ without the mineral acid participation in the complex structure. The most efficient extractant of lead(II) from the concentrated chloride solutions was 3-[1-(hydroxyimine)undecyl]-1-propylpyridinium chloride. Laboratory-scale experiments indicated that 3-[1-(hydroxyimine)undecyl]-1-propylpyridinium chloride can be proposed as a selective Pb(II) extractant from the Pb-Zn-Cu and Pb-Zn-Fe mixtures.

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