New publication in Journal of Hazardous Materials: Sulfidated nano-scale zerovalent iron is able to effectively reduce in situ hexavalent chromium in a contaminated aquifer

05.12.2020

In recent laboratory studies, sulfidated nanoscale zero-valent iron (S-nZVI) particles showed increased reactivity, reducing capacity, and electron selectivity for Cr(VI) removal from contaminated waters.

This study assessed the field performance of commercially available core-shell S-nZVI particles to remediate an aquifer contaminated with Cr(VI) at a former chrome plating facility. S-nZVI migrated towards monitoring wells, resulting in a rapid decrease in Cr(VI) and total dissolved Cr concentrations and a long-term decrease in groundwater redox potential. Characterization of materials recovered from the injection and monitoring wells confirmed the presence of S-nZVI particles covered with insoluble  chromium(III)-iron(III) (oxyhydr)oxides. Geochemical modelling confirmed the overall stability of the resulting Cr(III) phase at field conditions.

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