The DOI matches its Crossref record; 68 of the 68 references it cites were found in a registry or an index.
Dechlorination of Excess Trichloroethene by Bimetallic and Sulfidated Nanoscale Zero-Valent Iron
Abstract
Nanoscale zerovalent iron (nZVI) likely finds its application in source zone remediation. Two approaches to modify nZVI have been reported: bimetal (Fe–Me) and sulfidated nZVI (S-nZVI). However, previous research has primarily focused on enhancing particle reactivity with these two modifications under more plume-like conditions. In this study, we systematically compared the trichloroethene (TCE) dechlorination pathway, rate, and electron selectivity of Fe-Me (Me: Pd, Ni, Cu, and Ag), S-nZVI, and nZVI with excess TCE simulating source zone conditions. TCE dechlorination on Fe-Me was primarily via hydrogenolysis while that on S-nZVI and nZVI was mainly via β-elimination. The surface-area normalized TCE reduction rate ( k ′ SA ) of Fe–Pd, S-nZVI, Fe–Ni, Fe–Cu, and Fe–Ag were ∼6800-, 190-, 130-, 20-, and 8-fold greater than nZVI. All bimetallic modification enhanced the competing hydrogen evolution reaction (HER) while sulfidation inhibited HER. Fe–Cu and Fe–Ag negligibly enhanced electron utilization efficiency (ε e ) while Fe–Pd, Fe–Ni, and S-nZVI dramatically increased ε e from 2% to ∼100%, 69%, and 72%, respectively. Adsorbed atomic hydrogen was identified to be responsible for the TCE dechlorination on Fe–Me but not on S-nZVI. The enhanced dechlorination rate along with the reduced HER of S-nZVI can be explained by that FeS conducting major electrons mediated TCE dechlorination while Fe oxides conducting minor electrons mediated HER.
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Cites
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Cited by
Xu, J., Avellan, A., Li, H., Liu, X., Noël, V., Lou, Z., Wang, Y., Kaegi, R., Henkelman, G., & Lowry, G. V. (2020) · Advanced Materials · doi:10.1002/adma.201906910 · Cited by 389
Removal of organic compounds by nanoscale zero-valent iron and its composites
Li, Q., Chen, Z., Wang, H., Yang, H., Wen, T., Wang, S., Hu, B., & Wang, X. (2021) · Science of The Total Environment · doi:10.1016/j.scitotenv.2021.148546 · Cited by 380
Metadata
- Authors
- He, F., Li, Z., Shi, S., Xu, W., Sheng, H., Gu, Y., Jiang, Y., & Xi, B.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-06-28
- Volume
- 52
- Issue
- 15
- Pages
- 8627-8637
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2810575418
- Cited by
- 363
- References
- 68
- FWCI
- 11.80
- Type
- journal article
- Language
- en
- Open access
- closed
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