期刊
WATER RESEARCH
卷 47, 期 17, 页码 6639-6649出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2013.08.035
关键词
cis-DCE; Reductive dechlorination; EXAFS; Green rust; Magnetite; Mackinawite
资金
- NSF [CBET-0730064]
- Korean Ministry of Environment as The GAIA Project [173-092-011]
- Research Fund Program of Research Institute for Basic Sciences, Pusan National University [RIBS-PNU-2010-309]
- Department of Energy, Office of Biological and Environmental Research
- National Institutes of Health, National Center for Research Resources, Biomedical Technology Program
The pH impact on reductive dechlorination of cis-dichloroethylene (cis-DCE) was investigated using in situ Fe precipitates formed under iron-rich sulfate-reducing conditions. The dechlorination rate of cis-DCE increased with pH, which was attributed to changes in the solid-phase Fe concentration, the composition of Fe minerals, and the surface speciation of Fe minerals. With increasing pH, larger quantities of Fe minerals, having much greater reactivity than dissolved Fe(II), were produced. Fe-K edge X-ray absorption spectroscopy (XAS) analysis of Fe precipitates revealed the presence of multiple Fe phases with their composition varying with pH. Correlation analyses were performed to examine how the solid-phase Fe concentration, the composition of Fe minerals, and their surface speciation were linked with the cis-DCE dechlorination rate. Such analyses revealed that neither mackinawite (FeS) nor magnetite (Fe3O4) was reactive with cis-DCE dechlorination, but that Fe (oxyhydr)oxides including green rusts and Fe(OH)(2) were reactive. Based on a proposed model of the surface acidity of Fe minerals, the increasing deprotonated surface Fe(II) groups with pH correlated well with the enhanced cis-DCE dechlorination. (C) 2013 Elsevier Ltd. All rights reserved.
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