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Liquid-liquid extraction of platinum(II) with cyclic tetrathioethers
K Saito1, I Taninaka, Y Yamamoto
1Division of Natural Environment and Chemistry, Faculty of Human Development, Kobe University, Tsurakabuto, Nada, Kobe 657-8501, Japan.
Talanta
|October 31, 2008
Summary
Thiourea significantly enhances platinum(II) extraction using cyclic tetrathioethers. The 16-membered macrocycle offers the fastest and most efficient liquid-liquid extraction of platinum(II) in chloride solutions.
Area of Science:
- Analytical Chemistry
- Inorganic Chemistry
- Separation Science
Background:
- Platinum(II) recovery from chloride solutions is challenging due to slow reaction kinetics.
- Macrocyclic ligands, specifically cyclic tetrathioethers, show potential for platinum complexation.
- Optimizing extraction conditions is crucial for efficient platinum recovery.
Purpose of the Study:
- To investigate the liquid-liquid extraction efficiency of platinum(II) using various cyclic tetrathioethers.
- To evaluate the impact of thiourea on the extraction rate and efficiency of platinum(II).
- To compare the performance of 12-, 14-, and 16-membered cyclic tetrathioethers in platinum(II) extraction.
Main Methods:
- Liquid-liquid extraction using 12-, 14-, and 16-membered cyclic tetrathioethers.
- Chloride solutions containing platinum(II) were used as the aqueous phase.
- Bromocresol Green as the counter anion and 1,2-dichloroethane as the organic solvent.
- The effect of thiourea addition on platinum(II) extraction kinetics was systematically studied.
Main Results:
- Platinum(II) extraction was minimal with cyclic tetrathioethers alone due to slow kinetics.
- Addition of thiourea dramatically accelerated the extraction rate of platinum(II).
- The 16-membered cyclic tetrathioether exhibited a faster extraction rate compared to the 12- and 14-membered analogues.
- Quantitative extraction of platinum(II) was achieved within 5 hours using the 16-membered tetrathioether and thiourea.
Conclusions:
- Thiourea is essential for enhancing the rate of platinum(II) extraction with cyclic tetrathioethers.
- The size of the macrocyclic ring influences extraction kinetics, with larger rings being more effective.
- The 16-membered cyclic tetrathioether, in conjunction with thiourea, provides an efficient method for platinum(II) recovery from chloride solutions.
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