Chemical Bond Bridging across Two Domains: Generation of Fe(ll) and In Situ Formation of FeSx on Zerovalent Iron

Yue Zhang; Zhongkai Duan; Yuhao Jin

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Chemical Bond Bridging across Two Domains: Generation of Fe(ll) and In Situ Formation of FeSx on Zerovalent Iron

机译：Chemical Bond Bridging across Two Domains: Generation of Fe(ll) and In Situ Formation of FeSx on Zerovalent Iron

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Sulfidation of zerovalent iron (SZVI) can strengthen the decontamination ability by promoting the electron transfer from inner Fe to external pollutants by iron sulfide (FeSx). Although FeS, forms easily, the mechanism for the FeSx bonding on the ZVI surface through a liquid precipitation method is elusive. In this work, we demonstrate a key pathway for the sulfidation of ZVI, namely, the in situ formation of FeSx on ZVI surface, which leads to chemical bonding across two domains: the pristine ZVI and the newly formed FeS^. phase. The two chemically bridged heterophases display superior activity in electron transportation compared to the physically coated SZVI, eventually bringing about the better performance in reducing Cr(Vl) species. It is revealed that the formation of chemically bonded FeSx requires balancing the rates for the two processes of Fe(ll) release and sulfidation, which can be achieved by tuning the pH and S( II) concentration. This study elucidates a mechanism for surface generation of FeSx on ZVI, and it provides new perspectives to design high-quality SZVI for environmental applications.

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来源
《Environmental Science & Technology: ES&T》 |2023年第30期|11336-11344|共9页
作者
Yue Zhang; Zhongkai Duan; Yuhao Jin;
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作者单位

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qjngdao 266237, China;

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering Shandong University, Qingdao 266237, China;

School of Materials Science and Engineering Tongji University, Shanghai 201804, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
zerovalent iron; sulfidation; interface; in situ formation; Cr(Vl) removal;

Chemical Bond Bridging across Two Domains: Generation of Fe(ll) and In Situ Formation of FeSx on Zerovalent Iron

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