Extraction of nanosize copper pollutants with an ionic liquid

Hsin Liang Huang; H. Paul Wang; Guor Tzo Wei; I. Wen Sun; Jing Fang Huang; Y. W. Yang

doi:10.1021/es060034s

Extraction of nanosize copper pollutants with an ionic liquid

Hsin Liang Huang, H. Paul Wang, Guor Tzo Wei, I. Wen Sun, Jing Fang Huang, Y. W. Yang

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Abstract

Speciation and possible reaction paths of nanosize copper pollutants extracted with a RTIL (room-temperature ionic liquid ([C₄mim][PF ₆], 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 ¹H 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(Mlm)₄(H₂O)₂] ²⁺ that acted as a carrier of copper into the RTIL matrix.

Original language	English
Pages (from-to)	4761-4764
Number of pages	4
Journal	Environmental Science and Technology
Volume	40
Issue number	15
DOIs	https://doi.org/10.1021/es060034s
Publication status	Published - 2006 Aug 1

All Science Journal Classification (ASJC) codes

General Chemistry
Environmental Chemistry

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10.1021/es060034s

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title = "Extraction of nanosize copper pollutants with an ionic liquid",

abstract = "Speciation and possible reaction paths of nanosize copper pollutants extracted with a RTIL (room-temperature ionic liquid ([C4mim][PF 6], 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 1H 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(Mlm)4(H2O)2] 2+ that acted as a carrier of copper into the RTIL matrix.",

author = "Huang, {Hsin Liang} and Wang, {H. Paul} and Wei, {Guor Tzo} and Sun, {I. Wen} and Huang, {Jing Fang} and Yang, {Y. W.}",

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T1 - Extraction of nanosize copper pollutants with an ionic liquid

AU - Huang, Hsin Liang

AU - Wang, H. Paul

AU - Wei, Guor Tzo

AU - Sun, I. Wen

AU - Huang, Jing Fang

AU - Yang, Y. W.

PY - 2006/8/1

Y1 - 2006/8/1

N2 - Speciation and possible reaction paths of nanosize copper pollutants extracted with a RTIL (room-temperature ionic liquid ([C4mim][PF 6], 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 1H 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(Mlm)4(H2O)2] 2+ that acted as a carrier of copper into the RTIL matrix.

AB - Speciation and possible reaction paths of nanosize copper pollutants extracted with a RTIL (room-temperature ionic liquid ([C4mim][PF 6], 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 1H 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(Mlm)4(H2O)2] 2+ that acted as a carrier of copper into the RTIL matrix.

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Extraction of nanosize copper pollutants with an ionic liquid

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