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Wang C, Li W, Zhang Z, Lei D, Che G, Gou C, Zhang J, Hao Z. A novel iron sulfide phase with remarkable hydroxyl radical generation capability for contaminants degradation. WATER RESEARCH 2024; 251:121166. [PMID: 38266437 DOI: 10.1016/j.watres.2024.121166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 12/21/2023] [Accepted: 01/17/2024] [Indexed: 01/26/2024]
Abstract
The hydroxyl radical (·OH) stands as one of the most potent oxidizing agents, capable of engaging in non-selective and instantaneous reactions with contaminants in water. Herein, we present a novel iron sulfide phase (S-FeS) characterized by an unprecedented structure, accompanied by its remarkable hydroxyl radical generation capability and contaminant degradation efficiency surpassing that of the conventional metastable iron sulfide phase, namely, the Mackinawite (FeS). In comparison to FeS, S-FeS exhibits enhanced degradation kinetics and higher efficacy in the removal of methylene blue, ciprofloxacin, and trivalent arsenic. Utilizing density functional theory (DFT) calculations, we postulate the mechanism for the exceptional contaminant degradation performance of S-FeS to be attributed to the increased exposure of the highly reactive (110) crystal facets. This research uncovers a new metastable phase that expands the polymorphisms within the iron sulfide family and showcases its capability for driving the oxygen reduction reaction.
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Affiliation(s)
- Chunli Wang
- Research Center for Environmental Material and Pollution Control Technology, National Engineering Laboratory for VOCs Pollution Control Materials & Technology, University of Chinese Academy of Sciences, Beijing 101408, PR China
| | - Wenjing Li
- Research Center for Environmental Material and Pollution Control Technology, National Engineering Laboratory for VOCs Pollution Control Materials & Technology, University of Chinese Academy of Sciences, Beijing 101408, PR China
| | - Zhihao Zhang
- Research Center for Environmental Material and Pollution Control Technology, National Engineering Laboratory for VOCs Pollution Control Materials & Technology, University of Chinese Academy of Sciences, Beijing 101408, PR China
| | - Dashi Lei
- School of Resources Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Guiquan Che
- Research Center for Environmental Material and Pollution Control Technology, National Engineering Laboratory for VOCs Pollution Control Materials & Technology, University of Chinese Academy of Sciences, Beijing 101408, PR China
| | - Chunli Gou
- Research Center for Environmental Material and Pollution Control Technology, National Engineering Laboratory for VOCs Pollution Control Materials & Technology, University of Chinese Academy of Sciences, Beijing 101408, PR China
| | - Jing Zhang
- Research Center for Environmental Material and Pollution Control Technology, National Engineering Laboratory for VOCs Pollution Control Materials & Technology, University of Chinese Academy of Sciences, Beijing 101408, PR China.
| | - Zhengping Hao
- Research Center for Environmental Material and Pollution Control Technology, National Engineering Laboratory for VOCs Pollution Control Materials & Technology, University of Chinese Academy of Sciences, Beijing 101408, PR China
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