Abstract
Dependency of extraction behavior of inert platinum group metals (PGMs) like Ru(III) and Rh(III) on temperature has been investigated in a biphasic system consisting of HNO3(aq) and betainium bis(trifluoromethylsulfonyl)amide ([Hbet][Tf2N]) ionic liquid. The extraction reactions of Ru(III) and Rh(III) took 3.5 days and 113 days, respectively, at 298 K, while equilibrated within 1 and 3 h to reach 99.2% and 96.5% extraction at 353 K. Further mechanistic studies clarified that the complexation of these PGMs and [Hbet]+ is rate-determining in their extraction and that it is successfully accelerated and enhanced by elevating the temperature.
Original language | English |
---|---|
Pages (from-to) | 1555-1559 |
Number of pages | 5 |
Journal | ACS Sustainable Chemistry and Engineering |
Volume | 6 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2018 Feb 5 |
Keywords
- Betainium
- Ionic liquid
- Platinum group
- Solvent extraction
- Thermomorphism
- Upper critical solution temperature
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Renewable Energy, Sustainability and the Environment