In situ X-ray absorption spectroscopic studies of copper in a copper-rich sludge during electrokinetic treatments

Shou-Heng Liu, Hong-Paul Wang, C. H. Huang, T. L. Hsiung

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Speciation of copper in a copper-rich chemical-mechanical polishing sludge during electrokinetic treatment has been studied by in situ extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) spectroscopy. The least-squares-fitted XANES spectra indicate that the main copper species in the sludge are Cu(OH) 2 (74%), nanosize CuO (20-60 nm) (13%) and CuO (>100 nm) (13%). The average bond distance and coordination number (CN) of Cu - O are 1.96 Å and 3.5, respectively. Under electrokinetic treatment (5 V cm -1 ) for 120 min, about 85% of the copper is dissolved in the electrolyte, 13% of which is migrated and enriched on the cathode. Notably the copper nanoparticles in the sludge can also migrate to the cathode under the electric field. By in situ EXAFS, it is found that during the electrokinetic treatment the bond distance and CN of Cu - O are increased by 0.1 Å and 0.9, respectively.

Original languageEnglish
Pages (from-to)202-206
Number of pages5
JournalJournal of Synchrotron Radiation
Volume17
Issue number2
DOIs
Publication statusPublished - 2010 Mar 1

Fingerprint

sludge
electrokinetics
X ray absorption
Copper
copper
x rays
coordination number
Cathodes
cathodes
fine structure
X ray absorption near edge structure spectroscopy
Chemical mechanical polishing
polishing
Electrolytes
Electric fields
electrolytes
Nanoparticles
nanoparticles
electric fields
spectroscopy

All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

@article{e454a24f2bd94bd6be964e0fcbabe662,
title = "In situ X-ray absorption spectroscopic studies of copper in a copper-rich sludge during electrokinetic treatments",
abstract = "Speciation of copper in a copper-rich chemical-mechanical polishing sludge during electrokinetic treatment has been studied by in situ extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) spectroscopy. The least-squares-fitted XANES spectra indicate that the main copper species in the sludge are Cu(OH) 2 (74{\%}), nanosize CuO (20-60 nm) (13{\%}) and CuO (>100 nm) (13{\%}). The average bond distance and coordination number (CN) of Cu - O are 1.96 {\AA} and 3.5, respectively. Under electrokinetic treatment (5 V cm -1 ) for 120 min, about 85{\%} of the copper is dissolved in the electrolyte, 13{\%} of which is migrated and enriched on the cathode. Notably the copper nanoparticles in the sludge can also migrate to the cathode under the electric field. By in situ EXAFS, it is found that during the electrokinetic treatment the bond distance and CN of Cu - O are increased by 0.1 {\AA} and 0.9, respectively.",
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In situ X-ray absorption spectroscopic studies of copper in a copper-rich sludge during electrokinetic treatments. / Liu, Shou-Heng; Wang, Hong-Paul; Huang, C. H.; Hsiung, T. L.

In: Journal of Synchrotron Radiation, Vol. 17, No. 2, 01.03.2010, p. 202-206.

Research output: Contribution to journalArticle

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