Hexavalent chromium reduction in contaminated soil: A comparison between ferrous sulphate and nanoscale zero-valent iron

•FeSO4 and colloidal nZVI are compared in the immobilization of Cr(VI) in a contaminated industrial soil.•Colloidal nZVI resulted in a faster and more efficient Cr(VI) reduction with respect to FeSO4.•The effect of the reduction treatment on metal mobilization and bioavailability was assessed by seq...

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Bibliographic Details
Published in:Journal of hazardous materials 2015-01, Vol.281, p.70-76
Main Authors: Di Palma, L., Gueye, M.T., Petrucci, E.
Format: Article
Language:English
Subjects:
Carboxymethyl cellulose
Chemical reduction
Chromium
Chromium - chemistry
Colloids
Ferrous Compounds - chemistry
Ferrous sulphate
Hexavalent chromium
Hydroxides - chemistry
Iron - chemistry
Lead (metal)
Metal Nanoparticles - chemistry
Nano zero-valent iron
Nanostructure
Nickel
Oxidation-Reduction
Oxides - chemistry
Reducing agents
Reduction
Soil (material)
Soil Pollutants - chemistry
Soil remediation
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Summary:•FeSO4 and colloidal nZVI are compared in the immobilization of Cr(VI) in a contaminated industrial soil.•Colloidal nZVI resulted in a faster and more efficient Cr(VI) reduction with respect to FeSO4.•The effect of the reduction treatment on metal mobilization and bioavailability was assessed by sequential extractions.•The mechanisms and the factors affecting the process are discussed. Iron sulphate (FeSO4) and colloidal nano zero-valent iron (nZVI) as reducing agents were compared, with the aim of assessing their effectiveness in hexavalent chromium [Cr(VI)] removal from a contaminated industrial soil. Experiments were performed on soil samples collected from an industrial site where a nickel contamination, caused by a long-term productive activity, was also verified. The influence of reducing agents amount with respect to chromium content and the effectiveness of deoxygenation of the slurry were discussed. The soil was fully characterized before and after each test, and sequential extractions were performed to assess chemico-physical modifications and evaluate metals mobility induced by washing. Results show that both the reducing agents successfully lowered the amount of Cr(VI) in the soil below the threshold allowed by Italian Environmental Regulation for industrial reuse. Cr(VI) reduction by colloidal nZVI proved to be faster and more effective: the civil reuse of soil [Cr(VI)
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2014.07.058