MoS 2 Modification to Enhance the Removal of Various Chlorinated Hydrocarbons by Zerovalent Iron
Various methods have been developed to enhance the performance of zerovalent iron (ZVI) for chlorinated hydrocarbon (CHC) removal, but their applicability across diverse CHCs remains limited. Here, we present a MoS modification strategy to address these challenges. MoS -modified ZVI (MoS -ZVI) exhib...
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| Vydané v: | Environmental science & technology Ročník 59; číslo 22; s. 11330 |
|---|---|
| Hlavní autori: | , , , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
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United States
10.06.2025
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| ISSN: | 1520-5851 |
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| Abstract | Various methods have been developed to enhance the performance of zerovalent iron (ZVI) for chlorinated hydrocarbon (CHC) removal, but their applicability across diverse CHCs remains limited. Here, we present a MoS
modification strategy to address these challenges. MoS
-modified ZVI (MoS
-ZVI) exhibited dechlorination rate constants that are 1.25 to 54 times those obtained with ZVI, for eight representative CHCs, with significantly fewer incompletely dechlorinated products. The electron efficiency values increased to 2.7-26.5 times, with the synchronously inhibited H
evolution possibly resulting from the increased hydrophobicity caused by MoS
modification. While H
contributes to the reduction of certain CHCs, the enhancement by MoS
is mainly attributed to improved electron transfer at the surface. Characterization results revealed partial integration of MoS
with ZVI and the presence of sulfur vacancies on MoS
surfaces in MoS
-ZVI. Electrochemical experiments with separated ZVI and MoS
in different compartments identified sulfur vacancies as the reactive sites. In situ Fourier transform infrared spectroscopy and density functional theory results demonstrated that CHCs adsorb at Mo sites exposed by sulfur vacancies, and this process is facilitated by the integrated effects of underlying ZVI. The dechlorination of CHCs subsequently occurs with the electrons transferred from ZVI to the surface-bonded CHC through the MoS
layer. This study provides a broadly applicable modification strategy for achieving rapid, full, and selective dechlorination of a wide range of CHCs. |
|---|---|
| AbstractList | Various methods have been developed to enhance the performance of zerovalent iron (ZVI) for chlorinated hydrocarbon (CHC) removal, but their applicability across diverse CHCs remains limited. Here, we present a MoS
modification strategy to address these challenges. MoS
-modified ZVI (MoS
-ZVI) exhibited dechlorination rate constants that are 1.25 to 54 times those obtained with ZVI, for eight representative CHCs, with significantly fewer incompletely dechlorinated products. The electron efficiency values increased to 2.7-26.5 times, with the synchronously inhibited H
evolution possibly resulting from the increased hydrophobicity caused by MoS
modification. While H
contributes to the reduction of certain CHCs, the enhancement by MoS
is mainly attributed to improved electron transfer at the surface. Characterization results revealed partial integration of MoS
with ZVI and the presence of sulfur vacancies on MoS
surfaces in MoS
-ZVI. Electrochemical experiments with separated ZVI and MoS
in different compartments identified sulfur vacancies as the reactive sites. In situ Fourier transform infrared spectroscopy and density functional theory results demonstrated that CHCs adsorb at Mo sites exposed by sulfur vacancies, and this process is facilitated by the integrated effects of underlying ZVI. The dechlorination of CHCs subsequently occurs with the electrons transferred from ZVI to the surface-bonded CHC through the MoS
layer. This study provides a broadly applicable modification strategy for achieving rapid, full, and selective dechlorination of a wide range of CHCs. |
| Author | Guan, Xiaohong Chen, JiaXin Ao, Zhimin Liu, Yabo Fan, Peng Feng, Yiran Qin, Hejie |
| Author_xml | – sequence: 1 givenname: JiaXin surname: Chen fullname: Chen, JiaXin organization: Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, P. R. China – sequence: 2 givenname: Yiran surname: Feng fullname: Feng, Yiran organization: Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, P. R. China – sequence: 3 givenname: Yabo surname: Liu fullname: Liu, Yabo organization: Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, P. R. China – sequence: 4 givenname: Peng orcidid: 0000-0001-5544-2277 surname: Fan fullname: Fan, Peng organization: Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, P. R. China – sequence: 5 givenname: Zhimin orcidid: 0000-0003-0333-3727 surname: Ao fullname: Ao, Zhimin organization: Advanced Interdisciplinary Institute of Environment and Ecology, Guangdong Provincial Key Laboratory of Wastewater Information Analysis and Early Warning, Beijing Normal University, Zhuhai 519087, P. R. China – sequence: 6 givenname: Hejie orcidid: 0000-0003-3718-9831 surname: Qin fullname: Qin, Hejie organization: Institute of Eco-Chongming, Shanghai 200062, P. R. China – sequence: 7 givenname: Xiaohong orcidid: 0000-0001-5296-423X surname: Guan fullname: Guan, Xiaohong organization: Institute of Eco-Chongming, Shanghai 200062, P. R. China |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/40444658$$D View this record in MEDLINE/PubMed |
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| Keywords | Dechlorination in situ FTIR ZVI Sulfur vacancy CHC |
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| Snippet | Various methods have been developed to enhance the performance of zerovalent iron (ZVI) for chlorinated hydrocarbon (CHC) removal, but their applicability... |
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| SubjectTerms | Disulfides - chemistry Hydrocarbons, Chlorinated Iron - chemistry Molybdenum - chemistry |
| Title | MoS 2 Modification to Enhance the Removal of Various Chlorinated Hydrocarbons by Zerovalent Iron |
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