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首页> 外文期刊>Environmental Science & Technology >Extraction of nanosize copper pollutants with an ionic liquid
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Extraction of nanosize copper pollutants with an ionic liquid

机译：用离子液体萃取纳米级铜污染物

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摘要

Speciation and possible reaction paths of nanosize copper pollutants extracted with a RTIL (room-temperature ionic liquid ([C(4)mim][PF6], 1-butyl-3-methylimidazolium hexafluorophosphate)) have been studied in the present work. Experimentally, in a very short contact time (2 min), 80-95% of nanosize CuO as well as other forms of copper (such as nanosize Cu, Cu2+, or Cu(II)(ads) (in the channels of MCM- 41)) in the samples could be extracted into the RTIL. The main copper species extracted in the RTIL as observed by XANES (X-ray absorption near edge structure) were Cu( II). Existence of Cu-N bondings with coordination numbers (CNs) of 3-4 for copper extracted in the RTIL was found by EXAFS (extended X-ray absorption fine structural) spectroscopy. Interestingly, chelation of Cu( II) with 1-methylimidazole (MIm) in the RTIL during extraction was also observed by H-1 NMR ( nuclear magnetic resonance). At least two possible reaction paths for the rapid extraction of nanosize copper pollutants with the RTIL might occur: (1) an enhanced dissolution of nanosize CuO (to form Cu2+) and (2) formation of [Cu(MIm)(4)(H2O)(2)](2+) that acted as a carrier of copper into the RTIL matrix.
机译：在本工作中，已经研究了用RTIL（室温离子液体（[C（4）mim] [PF6]，1-丁基-3-甲基咪唑鎓六氟磷酸盐）萃取的纳米级铜污染物的形态和可能的反应路径。实验上，在很短的接触时间（2分钟）内，MCM-的通道中有80-95％的纳米级CuO以及其他形式的铜（例如纳米级Cu，Cu2 +或Cu（II）（ads）） 41））中的样本可以提取到RTIL中。通过XANES（在边缘结构附近的X射线吸收）观察到，在RTIL中提取的主要铜物种为Cu（II）。通过EXAFS（扩展X射线吸收精细结构）光谱法，发现RTIL中提取的铜的Cu-N键的配位数（CNs）为3-4。有趣的是，在萃取过程中，通过H-1 NMR（核磁共振）也观察到了RTIL中Cu（II）与1-甲基咪唑（MIm）的螯合。用RTIL快速萃取纳米级铜污染物的至少两种可能的反应路径可能是：（1）纳米级CuO的溶解增强（形成Cu2 +）和（2）[Cu（MIm）（4）（H2O）的形成）（2）]（2+）作为RTIL矩阵中的铜载体。

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