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首页> 外文期刊>Separation and Purification Technology >Effect of SCN- and NO3- ions on the extraction of heavy metals from aqueous solutions with the ionic liquid trihexylammonium octanoate
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Effect of SCN- and NO3- ions on the extraction of heavy metals from aqueous solutions with the ionic liquid trihexylammonium octanoate

机译：SCN-和NO3-与离子液体三己基辛酸水溶液中重金属提取的影响

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摘要

The protic ionic liquid, trihexylammonium octanoate [T(6)AC(7)COO], was used in order to extract heavy metals ions, such as Cu(II), Co(II) and Ni(II), from aqueous solutions at room temperature, using different counter anions (SO42-, Cl- and NO3-). This ionic liquid is highly selective towards copper(II) but not to cobalt(II) and nickel(II). The metal ion extraction capacity of [T(6)AC(7)COO] also depends on the counter anion of the metal salt: NO3- > Cl- > SO42-. When nitrate ions (NO3-) are added to aqueous solutions containing CoSO4, CoCl2, NiSO4, or NiCl2, before the extraction process, the extraction efficiency of [T(6)AC(7)COO] is increased from near zero percent to around 20% - 40%, which can be considered as a good rise. However, the addition of thiocyanate ions (SCN-) to aqueous solutions, instead of nitrate ions, increases substantially the Co(II) and Ni(II) recovery yields. Practically all the metal ions together with SCN- ions are transferred from the aqueous phase to the ionic liquid phase. In the extracted phase, SCN- anions bind to the metal center through the N atoms. In contrast, the other anions do not coordinate with the metal ion. For all extraction processes, an ion-par extraction is the dominant mechanism. H-1 NMR, FT-IR and ion chromatography were used in order to confirm the extraction mechanism, and UV-visible spectroscopy and ICP-OES were used to estimate the extraction efficiency of [T(6)AC(7)COO].
机译：使用质子离子液体，三己铵辛酸[T（6）AC（7）COO]，以从水溶液中提取重金属离子，例如Cu（II），Co（II）和Ni（II））室温，使用不同的柜台阴离子（SO42-，CL-和NO3-）。该离子液体对铜（II）具有高度选择性，但不是钴（II）和镍（II）。 [T（6）AC（7）COO]的金属离子萃取能力还取决于金属盐的抗衡阴离子：NO3-> CL-OXO-> SO42-。当在萃取过程之前将硝酸根离子（NO 3-）加入到含CosO4，COCl2，NISO 4或NiCl2的水溶液中时，[T（6）AC（7）COO]的提取效率从零百分比增加到周围20％ - 40％，可视为良好的崛起。然而，将硫氰酸酯离子（SCN-）加入水溶液，代替硝酸根离子，基本上增加CO（II）和Ni（II）回收率。实际上所有金属离子与SCN-离子一起从水相转移到离子液相。在提取的相中，SCN-阴离子通过N原子与金属中心结合。相反，其他阴离子不与金属离子坐标。对于所有提取过程，离子萃取是主导机制。使用H-1 NMR，FT-IR和离子色谱法以确认萃取机制，使用UV可见光谱和ICP-OES来估计[T（6）AC（7）COO]的提取效率。

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