Effects of citrate on hexavalent chromium reduction by structural Fe(II) in nontronite

Liu, Xiaolei; Dong, Hailiang; Yang, Xuewei; Kovarik, Libor; Chen, Yu; Zeng, Qiang

doi:10.1016/J.JHAZMAT.2017.09.038

Effects of citrate on hexavalent chromium reduction by structural Fe(II) in nontronite

Journal Article · Sat Sep 23 00:00:00 EDT 2017 · Journal of Hazardous Materials

DOI:https://doi.org/10.1016/J.JHAZMAT.2017.09.038· OSTI ID:1395357

Liu, Xiaolei ^[1]; Dong, Hailiang ^[2]; Yang, Xuewei ^[1]; Kovarik, Libor ^[3]; Chen, Yu ^[1]; Zeng, Qiang ^[1]

China Univ. of Geosciences, Beijing (China)
China Univ. of Geosciences, Beijing (China); Miami Univ., Oxford, OH (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Previous studies have shown that organic ligands could influence Cr(VI) reduction by aqueous Fe²⁺ and pyrite. In this study, the effects of citrate on Cr(VI) reduction by structural Fe(II) in nontronite (NAu-2) were investigated at pH 6. Our results showed that the presence of citrate decreased the rate but increased the amount of Cr(VI) reduction. The decreased rate was likely due to competitive sorption of citrate and anionic dichromate (Cr₂O₇–) to NAu-2 surface sites, because sorption of dichromate appeared to be the first step for subsequent Cr(VI) reduction. The increased amount of Cr(VI) reduction was likely because citrate served as an additional electron donor to reduce Cr(VI) through ligand-metal electron transfer in the presence of soluble Fe³⁺, which was possibly derived from dissolution of reduced NAu-2. Soluble Cr(III)-citrate complex was a possible form of reduced Cr(VI) when citrate was present. Without citrate, nanometer-sized Cr₂O₃ particles were the product of Cr(VI) reduction. In conclusion, our study highlights the importance of citrate on Cr(VI) reduction and immobilization when iron-rich smectite is applied to treat Cr(VI) contaminant in organic carbon rich environments.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1395357

Alternate ID(s):: OSTI ID: 1416673
OSTI ID: 22737554

Journal Information:: Journal of Hazardous Materials, Journal Name: Journal of Hazardous Materials Journal Issue: C Vol. 343; ISSN 0304-3894

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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