2020年1月
Synergistic Enhancement of the Extraction and Separation Efficiencies of Lanthanoid(III) Ions by the Formation of Charged Adducts in an Ionic Liquid
Industrial & Engineering Chemistry Research
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- 巻
- 59
- 号
- 1
- 開始ページ
- 329
- 終了ページ
- 340
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.iecr.9b04998
- 出版者・発行元
- AMER CHEMICAL SOC
The synergistic ionic-liquid extraction and extraction equilibrium of lanthanoid(III) (Ln(III)) ions have been investigated using 2-thenoyltrifluoroacetone (Htta) and trioctylphosphine oxide (TOPO) in the ionic liquid 1-butyl-3 methylimidazolium bis(trifluoromethanesulfonyl)imide ([C(4)mim][Tf2N]). The selective synergistic effect for heavier Ln(III) ions was found using a combination of Htta and TOPO in [C(4)mim] [Tf2N], leading to enhanced separability among Ln(III) ions. The extracted Ln(III) species and the extraction constants in the Htta-TOPO system were determined by three-dimensional extraction equilibrium analysis. In this system, the neutral adduct, Ln(tta)(3)(TOPO)(2), and the cationic charged adducts, Ln(tta)(2)(TOPO)(2)(+), Ln(tta)(2)(TOPO)(3)(+), and Ln(tta)(TOPO)(3)(2+), were extracted into the [C(4)mim][Tf2N] phase. The adduct formation constants in [C(4)mim][Tf2N] were determined to evaluate the synergistic effect of Htta and TOPO on the extraction of Ln(III) ions. The selective synergism for heavier Ln(III) ions in the Htta-TOPO system was ascribed to the formation of hydrophobic, charged adducts, such as Ln(tta)(2)(TOPO)(3)(+) and Ln(tta)(TOPO)(3)(2+), in [C(4)mim][Tf2N].
- リンク情報
- ID情報
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- DOI : 10.1021/acs.iecr.9b04998
- ISSN : 0888-5885
- Web of Science ID : WOS:000507144500034