Abstract
Removal of Zn(II) from chloride acidic solutions with hydrophobic quaternary salts The equilibrium of zinc(II) extraction from hydrochloric acid solutions with phosphonium and ammonium quaternary salts and their application as carriers in polymer inclusion membranes were studied. The most efficient was the extraction of zinc with the use of chlorides and bromide of ammonium and phosphonium salt (more than 90%). Quaternary ammonium and phosphonium chlorides and bromide are efficient extractants of zinc(II) from hydrochloric acid solutions. Two-fold molar excess of extractant over Zn(II) is necessary for efficient extraction (100%). Solvent extraction power of the extractants studied decreases with increasing hydrophobicity of the anion in the following sequence: QPCl > QPBr > QPBis > QACl > QABF4 > QPBF4 > QPPF6 > QPNtf2. A solution of 1 M H2 SO4 is chosen as the best stripping phase from the technological and economical point of view. Transport across polymeric inclusion membrane enables concentration of the stripping solution; however it takes a very long time.
Highlights
Protection of the natural environment is one of the most important issues of the contemporary world
A great advantage of ILs is their easiness to replace the anion that makes it possible to design compounds with required properties, suited to the particular system[5, 6]. It is the aim of this work to study the equilibrium of zinc(II) extraction from hydrochloric acid solutions with phosphonium and ammonium quaternary salts, and to apply them as carriers in polymer inclusion membranes
The most efficient extraction is observed for chlorides and bromide of ammonium and phosphonium salt
Summary
Protection of the natural environment is one of the most important issues of the contemporary world. Selective zinc recovery from spent pickling solutions is an important issue in Poland, where there are more than 50 hot-dip galvanizing plants. Liquid-liquid extraction is one of the methods applied for treatment of spent pickling solutions[2]. As a result of an increasing number of literature records on ILs, we propose recovery of zinc and iron ions from spent pickling solutions with phosphonium quaternary salts (classified as ILs). A great advantage of ILs is their easiness to replace the anion that makes it possible to design compounds with required properties, suited to the particular system[5, 6] It is the aim of this work to study the equilibrium of zinc(II) extraction from hydrochloric acid solutions with phosphonium and ammonium quaternary salts, and to apply them as carriers in polymer inclusion membranes.
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