Liquid-Liquid Extraction of Ferric Ions into the Ionic Liquids
Abstract
:1. Introduction
2. Materials and Methods
2.1. Chemicals
- 1-ethyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide-[C2mim][NTf2]
- 1-butyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide-[C4mim][NTf2]
- 1-hexyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide-[C6mim][NTf2]
- Methyltrioctylammonium bis (trifluoromethanesulfonyl) imide-[N1888][NTf2]
- Tributylmethylammonium bis (trifluoromethanesulfonyl) imide-[N1444][NTf2]
2.2. Instrumentation and Methods
- HNO3 in a concentration of 0.001–1.5 mol L−1 or
- 0.2 M phosphate buffer or
- 0.1 M borate buffer or
- 0.01 M H2Ox or 0.005 M H3Cit or the mixture of 0.01 M H2Ox and 0.005 M H3Cit
- Equal volumes (1 mL) of organic and aqueous phases were contacted in Eppendorf microvials and shaken for 30 min at laboratory temperature.
- Aqueous and organic phases were separated by centrifugation (5 min at 700 RCF)
- 200 μL aliquots were taken from both phases and measured in a well-type 2″ NaI (Tl) scintillation detector connected to an NV 3102 single-channel counter.
- After the separation of phases, the equilibrium pH values of the aqueous phase were measured using a digital pH meter PHM240 equipped with a combination Red-Rod glass electrode.
3. Results and Discussions
3.1. Acetylacetone
3.2. Thenoyltrifluoroacetone
3.3. 8-Hydroxyquinoline
3.4. Extraction from Aqueous Solution Containing Common Complexing Agents
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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[C2mim][NTf2] | [C4mim][NTf2] | [C6mim][NTf2] | [N1444][NTf2] | [N1888][NTf2] | Benzene | |
---|---|---|---|---|---|---|
Slope | 0.93 ± 0.03 | 1.19 ± 0.60 | 1.33 ± 0.08 | 1.17 ± 0.03 | 1.20 ± 0.17 | 1.64 ± 0.05 |
pH1/2 | 1.31 ± 0.06 | 1.46 ± 0.10 | 1.59 ± 0.14 | 2.33 ± 0.08 | 2.15 ± 0.31 | 1.06 ± 0.05 |
[C4mim][NTf2] | Benzene | |
---|---|---|
slope | 1.79 ± 0.24 | 1.82 ± 0.12 |
pH1/2 | 2.78 ± 0.41 | 1.91 ± 0.19 |
[C2mim][NTf2] | [C4mim][NTf2] | [C6mim][NTf2] | [N1444][NTf2] | [N1888][NTf2] | CHCl3 | |
---|---|---|---|---|---|---|
Slope pH ~ 1.2 | 3.19 ± 0.26 | 3.82 ± 0.15 | 3.38 ± 0.60 | 2.80 ± 0.19 | (2.97) | 4.96 ± 0.12 |
Slope pH ~ 2 | (0.66) | 1.00 ± 0.06 | 1.24 ± 0.19 | 1.48 ± 0.18 | 1.44 ± 0.03 | 0.66 ± 0.03 |
pH1/2 | 1.66 ± 0.19 | 1.37 ± 0.08 | 1.35 ± 0.34 | 1.49 ± 0.13 | 1.53 ± 0.05 | 1.19 ± 0.04 |
No Complexant | H3Cit | H2Ox | 0.005 M H3Cit + 0.01 M H2Ox | |||
---|---|---|---|---|---|---|
0.005 M | 0.01 M | 0.005 M | 0.01 M | |||
0.5 M AcAc in benzene | 97.5 ± 0.5% | 98.9 ± 0.4% | 95.2 ± 0.4% | 2.3 ± 0.1% | 5.2 ± 0.1% | 5.1 ± 0.1% |
pHeq | 2.3 | 2.8 | 2.6 | 2.4 | 2.1 | 2.1 |
0.5 M AcAc in [C4mim][NTf2] | 94.7 ± 0.5% | 91.5 ± 0.4% | 85.8 ± 0.4% | 0.4 ± 0.1% | 0.1 ± 0.1% | 0.1 ± 0.1% |
pHeq | 2.7 | 2.8 | 2.6 | 2.4 | 2.1 | 2.1 |
0.1 M TTA in [C4mim][NTf2] | 33.8 ± 0.2% | 3.3 ± 0.1% | 0.2 ± 0.1% | 4.3 ± 0.1% | 0.4 ± 0.1% | 0.2 ± 0.1% |
pHeq | 2.3 | 2.6 | 2.4 | 2.8 | 2.0 | 2.0 |
0.4 M TTA in [C4mim][NTf2] | 87.0 ± 1.1% | 15.1 ± 0.1% | 2.9 ± 0.1% | 14.9 ± 0.1% | 1.1 ± 0.1% | 1.5 ± 0.1% |
pHeq | 3.3 | 2.6 | 2.4 | 2.8 | 2.1 | 2.1 |
0.1 M 8HQ in CHCl3 | >99.7% | >99.7% | >99.7% | 22.3 ± 1.3% | 6.7 ± 1.2% | 5.9 ± 0.1% |
pHeq | 3.1 | 3.8 | 3.5 | 3.8 | 3.4 | 3.3 |
0.1 M 8HQ in [C4mim][NTf2] | >99.7% | >99.7% | >99.7% | >99.7% | 87.2 ± 0.4% | 74.2 ± 0.3% |
pHeq | 4.3 | 5.0 | 4.7 | 5.0 | 4.5 | 4.3 |
0.5 M 8HQ in CHCl3 | >99.7% | >99.7% | >99.7% | 97.9 ± 0.5% | 79.8 ± 0.4% | 82.0 ± 0.4% |
pHeq | 4.0 | 4.2 | 4.0 | 4.1 | 3.9 | 3.8 |
0.5 M 8HQ in [C4mim][NTf2] | >99.7% | >99.7% | >99.7% | >99.7% | >99.7% | >99.7% |
pHeq | 4.3 | 5.6 | 5.3 | 5.7 | 5.3 | 5.1 |
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Cubova, K.; Semelova, M.; Nemec, M.; Benes, V. Liquid-Liquid Extraction of Ferric Ions into the Ionic Liquids. Minerals 2022, 12, 11. https://doi.org/10.3390/min12010011
Cubova K, Semelova M, Nemec M, Benes V. Liquid-Liquid Extraction of Ferric Ions into the Ionic Liquids. Minerals. 2022; 12(1):11. https://doi.org/10.3390/min12010011
Chicago/Turabian StyleCubova, Katerina, Miroslava Semelova, Mojmir Nemec, and Vit Benes. 2022. "Liquid-Liquid Extraction of Ferric Ions into the Ionic Liquids" Minerals 12, no. 1: 11. https://doi.org/10.3390/min12010011
APA StyleCubova, K., Semelova, M., Nemec, M., & Benes, V. (2022). Liquid-Liquid Extraction of Ferric Ions into the Ionic Liquids. Minerals, 12(1), 11. https://doi.org/10.3390/min12010011