Application of iron-loaded activated carbon electrodes for electrokinetic remediation of chromium-contaminated soil in a three-dimensional electrode system

Hexavalent chromium from industrial residues is highly mobile in soil and can lead to the contamination of groundwater through runoff and leaching after rainfall. This paper focuses on the three-dimensional (3D) electrokinetic remediation (EKR) of chromium-contaminated soil from an industrial site....

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Bibliographic Details
Published in:Scientific reports 2018-04, Vol.8 (1), p.5753-11, Article 5753
Main Authors: Yan, Yujie, Xue, Fengjiao, Muhammad, Faheem, Yu, Lin, Xu, Feng, Jiao, Binquan, Shiau, YanChyuan, Li, Dongwei
Format: Article
Language:English
Subjects:
140/146
704/172/169/896
704/172/4081
Activated carbon
Chromium
Contamination
Electrodes
Groundwater
Humanities and Social Sciences
Leaching
multidisciplinary
Photoelectron spectroscopy
Rainfall
Runoff
Science
Science (multidisciplinary)
Soil contamination
Soil pollution
Soil remediation
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Summary:Hexavalent chromium from industrial residues is highly mobile in soil and can lead to the contamination of groundwater through runoff and leaching after rainfall. This paper focuses on the three-dimensional (3D) electrokinetic remediation (EKR) of chromium-contaminated soil from an industrial site. Activated carbon particles coupled with Fe ions (AC-Fe) were used as the third electrode. The optimum dose ratio of the electrode particles and remediation time were selected on the basis of single-factor experiments. X-ray photoelectron spectroscopy (XPS) analysis was carried out to explore the reduction of Cr(VI) on the surface of the electrode particles (AC-Fe). The results showed that AC-Fe had a positive effect on Cr(VI) reduction with a removal rate of 80.2%, which was achieved after 10 d by using a 5% dose of electrode particles. Finally, it was concluded that the removal mechanism combined the processes of electromigration, electrosorption/adsorption and reduction of Cr(VI) in the 3D EKR system.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-24138-z