Electrochemical remediation of copper-contaminated soils enhanced by ethylenediaminetetraacetic acid

An in-situ X-ray absorption spectroscopic study

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Abstract

Speciation of copper with ethylenediaminetetraacetic acid (EDTA) during electrotreatments of a contaminated soil nearby printed circuit board recycling plants has been studied by in-situ extended X-ray absorption fine structural (EXAFS) and X-ray absorption near edge structural (XANES) spectroscopies. The least-square fits of the copper XANES spectra indicated that the main copper species in the contaminated soil were CuCO3 (41%), CuO (40%) and adsorbed copper (Cu/SiO 2 ) (19%). By EXAFS studies, it was found that the bond distance of Cu-(O)-Si was 3.25 Å with a coordination number (CN) of 1.0 in the second shells, suggesting a chemical interaction between copper and the soil surfaces. In the presence of EDTA (0.05 M), a Cu-EDTA complex having the equatorial and axial Cu-O bond distances of 1.96 Å and 2.21 Å, respectively was observed. Interestingly, after 180 min of the electrotreatments, the axial Cu-O bond distance was increased by 0.1 Å. The perturbation might be attributed to the possibility that the weak-field carboxylic acid groups of EDTA in the equatorial plane of Cu(II) were replaced by the strong-field water molecules. In addition, about 36% of total copper in the soil was dissolved into the aqueous phase and 67% (or 24% of total copper) of which were migrated to the cathode under the electric field (5 V/cm). This work demonstrates the utilization of in-situ X-ray absorption spectroscopy for tracking and revealing speciation and possible reaction pathways of copper with EDTA in the contaminated soil under an electric field.

Original languageEnglish
Pages (from-to)4807-4817
Number of pages11
JournalInternational Journal of Electrochemical Science
Volume8
Issue number4
Publication statusPublished - 2013 Apr 1

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Ethylenediaminetetraacetic acid
X ray absorption
Remediation
Edetic Acid
Copper
Soils
Electric fields
X ray absorption spectroscopy
Carboxylic Acids
Carboxylic acids
Printed circuit boards
Recycling
Cathodes
Spectroscopy
Molecules
Water

All Science Journal Classification (ASJC) codes

  • Electrochemistry

Cite this

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title = "Electrochemical remediation of copper-contaminated soils enhanced by ethylenediaminetetraacetic acid: An in-situ X-ray absorption spectroscopic study",
abstract = "Speciation of copper with ethylenediaminetetraacetic acid (EDTA) during electrotreatments of a contaminated soil nearby printed circuit board recycling plants has been studied by in-situ extended X-ray absorption fine structural (EXAFS) and X-ray absorption near edge structural (XANES) spectroscopies. The least-square fits of the copper XANES spectra indicated that the main copper species in the contaminated soil were CuCO3 (41{\%}), CuO (40{\%}) and adsorbed copper (Cu/SiO 2 ) (19{\%}). By EXAFS studies, it was found that the bond distance of Cu-(O)-Si was 3.25 {\AA} with a coordination number (CN) of 1.0 in the second shells, suggesting a chemical interaction between copper and the soil surfaces. In the presence of EDTA (0.05 M), a Cu-EDTA complex having the equatorial and axial Cu-O bond distances of 1.96 {\AA} and 2.21 {\AA}, respectively was observed. Interestingly, after 180 min of the electrotreatments, the axial Cu-O bond distance was increased by 0.1 {\AA}. The perturbation might be attributed to the possibility that the weak-field carboxylic acid groups of EDTA in the equatorial plane of Cu(II) were replaced by the strong-field water molecules. In addition, about 36{\%} of total copper in the soil was dissolved into the aqueous phase and 67{\%} (or 24{\%} of total copper) of which were migrated to the cathode under the electric field (5 V/cm). This work demonstrates the utilization of in-situ X-ray absorption spectroscopy for tracking and revealing speciation and possible reaction pathways of copper with EDTA in the contaminated soil under an electric field.",
author = "Shou-Heng Liu and Hong-Paul Wang",
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T1 - Electrochemical remediation of copper-contaminated soils enhanced by ethylenediaminetetraacetic acid

T2 - An in-situ X-ray absorption spectroscopic study

AU - Liu, Shou-Heng

AU - Wang, Hong-Paul

PY - 2013/4/1

Y1 - 2013/4/1

N2 - Speciation of copper with ethylenediaminetetraacetic acid (EDTA) during electrotreatments of a contaminated soil nearby printed circuit board recycling plants has been studied by in-situ extended X-ray absorption fine structural (EXAFS) and X-ray absorption near edge structural (XANES) spectroscopies. The least-square fits of the copper XANES spectra indicated that the main copper species in the contaminated soil were CuCO3 (41%), CuO (40%) and adsorbed copper (Cu/SiO 2 ) (19%). By EXAFS studies, it was found that the bond distance of Cu-(O)-Si was 3.25 Å with a coordination number (CN) of 1.0 in the second shells, suggesting a chemical interaction between copper and the soil surfaces. In the presence of EDTA (0.05 M), a Cu-EDTA complex having the equatorial and axial Cu-O bond distances of 1.96 Å and 2.21 Å, respectively was observed. Interestingly, after 180 min of the electrotreatments, the axial Cu-O bond distance was increased by 0.1 Å. The perturbation might be attributed to the possibility that the weak-field carboxylic acid groups of EDTA in the equatorial plane of Cu(II) were replaced by the strong-field water molecules. In addition, about 36% of total copper in the soil was dissolved into the aqueous phase and 67% (or 24% of total copper) of which were migrated to the cathode under the electric field (5 V/cm). This work demonstrates the utilization of in-situ X-ray absorption spectroscopy for tracking and revealing speciation and possible reaction pathways of copper with EDTA in the contaminated soil under an electric field.

AB - Speciation of copper with ethylenediaminetetraacetic acid (EDTA) during electrotreatments of a contaminated soil nearby printed circuit board recycling plants has been studied by in-situ extended X-ray absorption fine structural (EXAFS) and X-ray absorption near edge structural (XANES) spectroscopies. The least-square fits of the copper XANES spectra indicated that the main copper species in the contaminated soil were CuCO3 (41%), CuO (40%) and adsorbed copper (Cu/SiO 2 ) (19%). By EXAFS studies, it was found that the bond distance of Cu-(O)-Si was 3.25 Å with a coordination number (CN) of 1.0 in the second shells, suggesting a chemical interaction between copper and the soil surfaces. In the presence of EDTA (0.05 M), a Cu-EDTA complex having the equatorial and axial Cu-O bond distances of 1.96 Å and 2.21 Å, respectively was observed. Interestingly, after 180 min of the electrotreatments, the axial Cu-O bond distance was increased by 0.1 Å. The perturbation might be attributed to the possibility that the weak-field carboxylic acid groups of EDTA in the equatorial plane of Cu(II) were replaced by the strong-field water molecules. In addition, about 36% of total copper in the soil was dissolved into the aqueous phase and 67% (or 24% of total copper) of which were migrated to the cathode under the electric field (5 V/cm). This work demonstrates the utilization of in-situ X-ray absorption spectroscopy for tracking and revealing speciation and possible reaction pathways of copper with EDTA in the contaminated soil under an electric field.

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