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- W4293237914 abstract "A urea-introduced imidazolium-based ionic liquid (IL), 1-butyl-3-{3-(3-methyl-2H-imidazol-1-yl)propyl}urea bis(trifluoromethylsulfonyl)imide (L1), whose selectivity to Pt(IV) and Pd(II) was changed only by a pH region, was synthesized, and its Pt(IV) and Pd(II) extraction behaviors were investigated. In the conventional organic extraction system, an organic extractant with a urea group, 1-butyl-3-(2-ethylhexyl)urea, in isooctane extracted Pt(IV) and Pd(II) in a similar pH range, the extraction equilibrium half-time (t1/2) of Pd(II) was 8.95 h. In contrast, in the IL extraction system, Pt(IV) and Pd(II) were extracted in the lower and higher pH regions, respectively, indicating the mutual separation of Pt(IV) and Pd(II) by pH-change. Furthermore, the extraction equilibrium t1/2 of Pd(II) with the IL extraction system was 0.18 h. Ultraviolet–visible and extended X-ray absorption fine structure spectroscopies of Pt(IV) and Pd(II) after extraction using the IL were conducted to determine the extraction mechanism. As a result, Pt(IV) was extracted as [PtCl6]2– via anion-exchange (outer-sphere complex). On the other hand, Pd(II) was extracted via a mixed reaction of ligand-exchange (inner-sphere complex) and anion-exchange. Finally, the IL extraction system did not produce a third phase even when loaded with a high concentration of Pt(IV)." @default.
- W4293237914 created "2022-08-27" @default.
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- W4293237914 date "2022-04-27" @default.
- W4293237914 modified "2023-10-16" @default.
- W4293237914 title "Urea-Introduced Ionic Liquid for the Effective Extraction of Pt(IV) and Pd(II) Ions" @default.
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- W4293237914 doi "https://doi.org/10.1021/acs.iecr.2c00304" @default.
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