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Τετάρτη 11 Ιανουαρίου 2017

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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