Hydrophobic sulfur core–shell layered metallic iron for nitrate reduction with nearly 100% dinitrogen selectivity: Mechanism and field studies
- Authors
- Choong, Choe Earn; Yoon, So Yeon; Wong, Kien Tiek; Kim, Minhee; Lee, Gooyong; Kim, Sang-Hyoun; Jeon, Byong Hun; Choi, Jaeyoung; Yoon, Yeomin; Choi, Eun Ha; Jang, Min
- Issue Date
- Feb-2023
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Zero-valent iron; Sulfur; Nitrate reduction; Field test
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.454, pp.1 - 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 454
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/172734
- DOI
- 10.1016/j.cej.2022.140083
- ISSN
- 1385-8947
- Abstract
- We prepared hydrophobic sulfur (S) core–shell-layered nano-zero-valent iron (Fe) (S-nZVI) via a post-sulfidation method with varying Fe/S mass ratios for NO3− reduction. Notably, S0.125ZVI (Fe/S = 0.125) showed good N[sbnd]O cleavage properties owing to its high electron (e−) transfer efficiency and low surface passivation. As a result, the S0.125ZVI exhibited higher selectivity of NO3− reduction toward N2 than sole nZVI in synthetic and actual NO3− groundwater in batch experiments. Density functional theory (DFT) calculations showed that H2 evolution over S-nZVI was suppressed by the S atom in the hollow site of the Fe(1 1 0) surface, resulting in nearly 100 % denitrification selectivity. Quenching tests revealed that e− transfer through the S atom toward the surface bounded by NOx species is the dominant denitrification mechanism of S-nZVI. Up-flow column tests using actual groundwater were conducted for 127 d, and S0.125ZVI demonstrated a removal capacity of up to 1907 mg-N/g NO3−. Field experiments using S0.125ZVI for NO3−-contaminated groundwater remediation were conducted over four months, confirming that S-nZVI may be an alternative to nZVI for in situ groundwater remediation.
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