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Selective Separation of Platinum in the Propyl-alcohol-Sodium Sulfate Two-phase Aqueous Extraction System
Asian Journal of Chemistry,
Vol. 22 No. 1 (2010): Vol 22 Issue 1, 2010
Abstract
The extraction separation and phase distribution behaviours of iodide
complexes of platinum(IV) in propyl-alcohol-sodium sulfate two-phase
aqueous extraction system have been investigated. The amount of Na2SO4
added, the initial volume of propyl alcohol and the acidity of the system
are mainly factors affecting the formation and phase separation of the
aqueous two-phase system. Platinum(IV) is found to be extracted into
the propyl alcohol phase due to ion pair formation of platinum(IV) as
[Pt I62-·2(PrOH2+)2] in the presence of KI and HCl medium. The experimental
results indicate that platinum can be quantitatively and highly
selectively extracted by the optimized method, using which > 99.0 %
extraction efficiency can be achieved. The proposed method has been
successfully applied to the selective separation of platinum from samples
containing large amount of base metals including Fe2+, Ca2+, Mg2+, Mn2+,
Al3+, Pb2+ and Zn2+ in synthetic sample and exhibits high selectivity to
platinum.
complexes of platinum(IV) in propyl-alcohol-sodium sulfate two-phase
aqueous extraction system have been investigated. The amount of Na2SO4
added, the initial volume of propyl alcohol and the acidity of the system
are mainly factors affecting the formation and phase separation of the
aqueous two-phase system. Platinum(IV) is found to be extracted into
the propyl alcohol phase due to ion pair formation of platinum(IV) as
[Pt I62-·2(PrOH2+)2] in the presence of KI and HCl medium. The experimental
results indicate that platinum can be quantitatively and highly
selectively extracted by the optimized method, using which > 99.0 %
extraction efficiency can be achieved. The proposed method has been
successfully applied to the selective separation of platinum from samples
containing large amount of base metals including Fe2+, Ca2+, Mg2+, Mn2+,
Al3+, Pb2+ and Zn2+ in synthetic sample and exhibits high selectivity to
platinum.
Keywords
Aqueous biphasic extraction system
Aqueous two-phase extraction
Platinum
Propyl alcohol
Potassium iodide
Sodium sulfate.
GAO†, Y., LIU*, X., TAO‡, Y., WANG§, J., WANG§, W., WU§, L., & WANG, X. (2009). Selective Separation of Platinum in the Propyl-alcohol-Sodium Sulfate Two-phase Aqueous Extraction System. Asian Journal of Chemistry, 22(1), 492–500. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/16669
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