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Title: Evaluating the Effectiveness of Nanotechnology in Environmental Remediation of a Highly Metal-Contaminated Area—Minas Gerais, Brazil.
Authors: Fonseca, Rita
Araújo, Joana
Pinho, Catarina
Albuquerque, Teresa
Editors: Martinez-Frias, Jesus
Seyler, Patrick
Keywords: metal contaminants
nanoparticles of zero-valent iron
laboratory scale experiment
metals adsorption
sequential gaussian simulation
Issue Date: 25-Jul-2022
Publisher: MDPI
Citation: Fonseca, R.; Araújo, J.; Pinho, C.; Albuquerque, T. Evaluating the Effectiveness of Nanotechnology in Environmental Remediation of a Highly Metal-Contaminated Area—Minas Gerais, Brazil. Geosciences 2022, 12, 287. geosciences12080287
Abstract: A column experiment at a laboratory level was carried out to assess the effect of the application of nanotechnology in the decontamination of soils and alluvial deposits with high levels of poten-tially toxic elements (PTEs). A suspension of zero-valent iron nanoparticles (nZVI) was injected at three different concentrations in selected samples (two sediments, one soil). For most of the el-ements, the retention by nZVI was proportional to the concentration of the suspension and the trend was similar. Metals were immobilized by adsorption on the surface layer of the nanoparti-cles and/or by complexation, co-precipitation, and chemical reduction. By day 60 following injec-tion, the nZVI lost reactivity and the retained species were desorbed and back into the soluble phase. The definition of spatial patterns for PTEs’ distribution allowed for the construction of contamination risk maps using a geostatistical simulation approach. The analysis obtained from the extractable contents of five target elements (Zn, Cu, Cd, Pb, As) was cross-checked with the estimated map network to assess their retention efficiency. Data from the analysis of these ele-ments, in the extractable phase and in the porewater of the sediments/soils, indicate the nZVI injection as a suitable technique for reducing the risk level of PTEs in contaminated Fe-rich tropical environments.
URI: geosciences12080287
Type: article
Appears in Collections:ICT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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