An Ultra-concentrated Hydrochloric Acid Model and Palladium Microemulsion Extraction Behavior

Chem. J. Chinese Universities

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An Ultra-concentrated Hydrochloric Acid Model and Palladium Microemulsion Extraction Behavior

HUANG Kun, XU Yi-Zhuang*, LI Wei-Hong, WENG Shi-Fu, WU Jin-Guang

State Key Laboratory of Rare Earth Material Chemistry and Application, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Received:2008-01-09 Revised:1900-01-01 Online:2008-07-10 Published:2008-07-10
Contact: XU Yi-Zhuang

Abstract

Abstract: Evolution of the microscopic aggregating structure in the palladium loaded TBP extractive organic phases, with the increase of hydrochloric acid extracted into, was characterized by various spectroscopic techniques. It is indicated that,(1) within the nano-water pools of W/O reversed micelles/microemulsions from TBP equilibrated with higher concentration aqueous HCl solutions, the concentration of acid were far higher than that of saturated concentrated hydrochloric acid. It means an ultra-concentrated hydrochloric acid formed in the nano-water pool; (2) the nanometer-sized confinement brings aggregation of a large amount of H⁺ and Cl^- ions within the micro-droplets, the coordination states of palladium complex ions were changed. It is possible that the hydrated H⁺ ions participate in the formation of complexes, H_mPdCl_n^z⁺; (3) with respect to various HmPdCl_n^z⁺ coordination compounds, such as PdCl₄^2-, HPdCl₄^- and H₂PdCl₄, their content ratios were different corresponding to the H⁺ ion concentrations in confined nano-water pools. The acidified TBP molecules have a higher surface activity. The association ability of the acidified TBP molecules with various H_mPdCl_n^z⁺ complexes plays an important role by influencing the palladium extraction behavior.

Key words: Ultra-concentrated hydrochloric acid, Microemulsion, Solvent extraction, Palladium, Solution structure

CLC Number:

O647.11

TrendMD:

HUANG Kun, XU Yi-Zhuang*, LI Wei-Hong, WENG Shi-Fu, WU Jin-Guang. An Ultra-concentrated Hydrochloric Acid Model and Palladium Microemulsion Extraction Behavior[J]. Chem. J. Chinese Universities, doi: .

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An Ultra-concentrated Hydrochloric Acid Model and Palladium Microemulsion Extraction Behavior

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