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• W2567874299 abstract "Abstract The extraction of copper species from the nanoporous sorbent into an ionic liquid ([C 4 mim][PF 6 ], 1-butyl-3-methylimidazolium hexafluorophosphate) was studied herein by means of X-ray absorption near edge structure (XANES) and X-ray absorption fine structure (EXAFS) spectroscopies. The nanoporous sorbent is composed of adsorbed humic acid (HA) on nanoporous SiO 2 to simulate copper-contaminated nanoporous soils. During extraction with [C 4 mim][PF 6 ] at 298, 323 and 393 K, approximately 20, 40 and 54%, respectively, of the copper species on the nanoporous sorbent were extracted into [C 4 mim][PF 6 ]. Using the least-square fitted XANES spectra, the major copper species on the nanoporous sorbent was determined to be Cu(II)-HA (Cu(II) adsorbed on HA) (86%). At 298, 323 and 393 K, the copper dissociated from the extracted Cu(II)-HA and immediately formed Cu(mim) 4 2 + (mim = 1-methylimidazole) in [C 4 mim][PF 6 ]. At 323 and 393 K, Cu(mim) 4 2 + was oxidized with oxygen in [C 4 mim][PF 6 ] to form nanosized CuO. In this study, it was found that at least three reaction paths for the extracted copper to take from the nanoporous sorbent to [C 4 mim][PF 6 ] at 298–393 K: (1) extraction of Cu(II)-HA from the nanoporous sorbent to [C 4 mim][PF 6 ]; (2) dissociation of copper from extracted Cu(II)-HA to form Cu(mim) 4 2 + in [C 4 mim][PF 6 ]; and (3) oxidation of Cu(mim) 4 2 + to form nanosized CuO in [C 4 mim][PF 6 ]. Combining 1 H and 31 P NMR spectra, nanosized CuO interacted with [C 4 mim][PF 6 ] at 393 K. The fitted EXAFS spectra show the Cu(mim) 4 2 + in [C 4 mim][PF 6 ] possessed a Cu N bond distance of 1.82 A at 298 and 323 K. It is also found that the Cu O bond distance was 1.93 A at 393 K. This work demonstrates that the XANES technique can reveal structural changes of the copper species from the nanoporous sorbent into [C 4 mim][PF 6 ] during extraction." @default.
• W2567874299 created "2017-01-13" @default.
• W2567874299 creator A5007082319 @default.
• W2567874299 date "2017-03-01" @default.
• W2567874299 modified "2023-09-24" @default.
• W2567874299 title "Extraction of copper species from the nanoporous sorbent with an ionic liquid" @default.
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• W2567874299 doi "https://doi.org/10.1016/j.molliq.2016.12.112" @default.
• W2567874299 hasPublicationYear "2017" @default.
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