Chromium(VI) removal by mechanochemically sulfidated zero valent iron and its effect on dechlorination of trichloroethene as a co-contaminant.

Author(s) Zou, H.; Hu, E.; Yang, S.; Gong, L.; He, F.
Journal Sci Total Environ
Date Published 2019 Feb 10
Abstract

Mechanochemically sulfidated microscale zero valent iron (S-mZVI) is a promising groundwater remediation material as it has been proven to be not only efficient in dechlorinating chlorinated compounds but also amenable to up-scaling. Yet, its efficiency in treating metal contaminants remains barely studied. In this study, we investigated the mechanism and efficiencies of Cr(VI) removal by S-mZVI and its effect on TCE dechlorination as a co-contaminant. The Cr(VI) removal by S-mZVI was mainly a chemisorption process and its kinetics was well fitted by a pseudo-second-order model. Alkaline pH inhibited Cr(VI) removal while dissolved oxygen slightly depressed the Cr(VI) removal. The Cr(VI) removal rapidly formed a non-conductive layer on S-mZVI surface to hinder further electron transfer from Fe core before H was able to accept any electrons to produce H, which resulted in 100% electron efficiencies of Cr(VI) removal but <1% of Fe utilization efficiency. The presence of Cr(VI) also dramatically inhibited the dechlorination of TCE and its electron efficiency as a co-contaminant by passivating the FeS surface. Therefore, Cr(VI) is likely to be an electron sink if present for remediation of other contaminants in groundwater.

DOI 10.1016/j.scitotenv.2018.09.003
ISSN 1879-1026
Citation Zou H, Hu E, Yang S, Gong L, He F. Chromium(VI) removal by mechanochemically sulfidated zero valent iron and its effect on dechlorination of trichloroethene as a co-contaminant. Sci Total Environ. 2019;650(Pt 1):419-426.