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

Journal Article · · Journal of Hazardous Materials
 [1];  [2];  [1];  [3];  [1];  [1]
  1. China Univ. of Geosciences, Beijing (China)
  2. China Univ. of Geosciences, Beijing (China); Miami Univ., Oxford, OH (United States)
  3. 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.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830; 41630103
OSTI ID:
1395357
Journal Information:
Journal of Hazardous Materials, Vol. 343, Issue C; ISSN 0304-3894
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

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Cited By (1)