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| Research advances in groundwater remediation by sulfidized nanoscale zerovalent iron |
| CHEN Zong-ding1,2, KONG Xiang-ke1, XU Chun-xue2, ZHANG Zhao-ji1, HUANG Yuan-ying2, SUN Hui-zhong2, AN Zi-yi2 |
1. Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China;
2. Key Laboratory of Ministry of Natural Resources for Eco-geochemistry, National Research Center for Geoanalysis, Beijing 100037, China |
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Abstract Compared with the traditional nanoscale zerovalent iron (nZVI) materials, sulfidized nanoscale zerovalent iron (S-nZVI) has the advantages of high activity and electron selectivity, which has attracted much attention in the remediation of groundwater contamination. Based on the systematic summary of the main synthesis and modification methods of S-nZVI, the reaction mechanism of S-nZVI with chlorine-containing organic pollutants and heavy metals was summarized. The synthesis process of S-nZVI (sulfidation method, sulfur precursors and S/Fe ratio) and the water environmental factors (pH and chemical components) are the important factors influencing the reactivity of S-nZVI with pollutants. In addition, the application prospects of S-nZVI in the groundwater remediation were reviewed from the aspects of its stability, mobility and biologic toxicity. Finally, the future research directions of S-nZVI were prospected to support the application of S-nZVI for in situ groundwater remediation.
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Received: 07 October 2023
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