Extraction of nanosize copper pollutants with an ionic liquid

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

Research output: Contribution to journalArticle

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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 languageEnglish
Pages (from-to)4761-4764
Number of pages4
JournalEnvironmental Science and Technology
Volume40
Issue number15
DOIs
Publication statusPublished - 2006 Aug 1

Fingerprint

Ionic Liquids
Ionic liquids
Copper
copper
pollutant
X ray absorption
chelation
Multicarrier modulation
Chelation
nuclear magnetic resonance
ionic liquid
Dissolution
spectroscopy
dissolution
Nuclear magnetic resonance
Spectroscopy
matrix

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Huang, Hsin Liang ; Wang, Hong-Paul ; Wei, Guor Tzo ; Sun, I-Wen ; Huang, Jing Fang ; Yang, Y. W. / Extraction of nanosize copper pollutants with an ionic liquid. In: Environmental Science and Technology. 2006 ; Vol. 40, No. 15. pp. 4761-4764.
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Extraction of nanosize copper pollutants with an ionic liquid. / Huang, Hsin Liang; Wang, Hong-Paul; Wei, Guor Tzo; Sun, I-Wen; Huang, Jing Fang; Yang, Y. W.

In: Environmental Science and Technology, Vol. 40, No. 15, 01.08.2006, p. 4761-4764.

Research output: Contribution to journalArticle

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