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Published on: December 20, 2016
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Thallium Transfer from Hydrochloric Acid Media into Pure Ionic Liquids
Evgeny E Tereshatov1, Maria Yu Boltoeva2,3, Valerie Mazan2,3
1Cyclotron Institute, Texas A&M University , College Station, Texas 77843 United States.
The Journal of Physical Chemistry. B
|January 16, 2016
Summary
This study explores thallium (Tl) extraction using fluorinated ionic liquids. Hydrophobic ionic liquids effectively extract anionic thallium species, while hydrophilic ones favor cationic Tl(+), with a model developed for coextraction.
Area of Science:
- Environmental Chemistry
- Radiochemistry
- Materials Science
Background:
- Ionic liquids (ILs) are effective in extracting metallic species from aqueous solutions.
- Pure hydrophobic ionic liquids show promise for selective metal extraction.
Purpose of the Study:
- To systematically investigate thallium (Tl) extraction from aqueous hydrochloric acid (HCl) solutions using six pure fluorinated ionic liquids.
- To understand the influence of ionic liquid structure, metal oxidation state, and solution concentrations on Tl extraction efficiency.
Main Methods:
- Systematic investigation of Tl extraction using imidazolium- and pyrrolidinium-based ionic liquids.
- Analysis of Tl concentrations using radioactive tracers (picomolar) and inductively coupled plasma mass spectrometry (millimolar).
- Development of a mathematical model based on ion exchange and ion pair formation.
Main Results:
- Extraction efficiency depends on ionic liquid cation hydrophilicity/hydrophobicity and Tl oxidation state.
- Hydrophilic cations favored cationic Tl(+) extraction; hydrophobic cations favored anionic Tl species extraction.
- Highest distribution value for Tl(III) reached approximately 2000.
Conclusions:
- The study elucidates the mechanisms governing Tl extraction by fluorinated ionic liquids.
- A model was developed to describe the coextraction of anionic species, highlighting ion exchange and ion pair formation.
- Findings provide insights into selective metal extraction using tailored ionic liquids.
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