Remediation of hexavalent chromium contaminated soil by stabilized nanoscale zero-valent iron prepared from steel pickling waste liquor

[Display omitted] •Steel pickling waste liquor is used as iron precursor to prepare nZVI.•Removal capacity of soil-bound Cr(VI) by CMC-nZVI is studied.•The removal mechanism of Cr(VI) in contaminated soil by CMC-nZVI is proposed.•Feasibility of CMC-nZVI in Cr(VI)-contaminated soil remediation is tes...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2014-07, Vol.247, p.283-290
Main Authors: Wang, Yu, Fang, Zhanqiang, Liang, Bin, Tsang, Eric Pokeung
Format: Article
Language:English
Subjects:
Chromium contamination
Mechanism
Nanoparticles
Nanoscale zero-valent iron (nZVI)
Nanostructure
Pickling
Remediation
Soil
Soil (material)
Steels
Wastes
X-ray photoelectron spectroscopy
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Summary:[Display omitted] •Steel pickling waste liquor is used as iron precursor to prepare nZVI.•Removal capacity of soil-bound Cr(VI) by CMC-nZVI is studied.•The removal mechanism of Cr(VI) in contaminated soil by CMC-nZVI is proposed.•Feasibility of CMC-nZVI in Cr(VI)-contaminated soil remediation is tested by TCLP. The removal of Cr(VI) from contaminated soil using sodium carboxymethyl cellulose (CMC)-stabilized nanoscale zero-valent iron prepared from steel pickling waste liquor was systematically investigated. Laboratory batch experiments indicated that 0.09gL−1 of Fe0 nanoparticles at a soil to solution ratio of 1g: 10mL completely reduced the aqueous-bound Cr(VI), which contributed about 46% of the pre-sorbed Cr(VI) in the soil (Cr(VI)=102mgkg−1). Furthermore, the addition of Fe0 nanoparticles only removed a portion of the soil-bound Cr(VI). When the soil was treated with 0.3gL−1 of Fe0 nanoparticles for 72h, 80% of the loaded Cr(VI) was reduced to Cr(III), which resulted in a residual Cr(VI) concentration of 20mgkg−1. Based on the studies of elemental distributions and XPS analysis, it is proposed that reduction and immobilization may be equally important removal mechanisms for Cr(VI) by CMC-nZVI. Following the treatment by CMC-nZVI, the TCLP leachability of the Cr(VI) and Crtotal was significantly reduced by 100% and 82%, respectively. This study sheds new light on the remediation of Cr(VI)-contaminated soil by CMC-nZVI.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2014.03.011