4.7 Article

Novel core-shell sulfidated nano-Fe(0) particles for chromate sequestration: Promoted electron transfer and Fe(II) production

期刊

CHEMOSPHERE
卷 284, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131379

关键词

Zero-valent iron; Sulfidation; Cr(VI); Reduction; Electron transfer

资金

  1. National Natural Science Foundation of China [41907153]
  2. National Key R&D Program of China [2021YFE0106600]
  3. Hubei Provincial Engineering Research Center of Systematic Water Pollution Control (China University of Geosciences, Wuhan, PR China) [20190729]
  4. National Research Foundation of Korea [2020R1A2C200439511, 2020M3H4A3106354]

向作者/读者索取更多资源

In this study, a novel sulfidated nZVI core-shell particles (FeS/Fe (0)) were successfully fabricated via a modified post sulfidation approach, showing better performance compared to traditional nano zero-valent iron in removing Cr(VI) from water. The sulfidated iron shell with higher electronegativity can accelerate iron corrosion, facilitate electron transfer, and improve the removal efficiency of Cr(VI).
Sulfidated nanoscale valent iron in form of FeS/Fe (0) shell-core nanoparticle has the aptitude to be a promising remediation material toward reductive removal of metal oxyanions. However, disrupted contact between Fe (0) core and FeS shell by thick iron oxides limited its reactivity improvement, and its mechanism of electron transfer remains unveiled. In this study, a novel sulfidated nZVI core-shell particles (FeS/Fe (0)) was fabricated via a modified post sulfidation approach to achieve a more uniform coverage of FeS for aqueous Cr(VI) sequestration. SEM and STEM tests confirmed the formation of the core-shell FeS/Fe (0) structure with a more solid interaction between FeS layer and Fe (0) core. The highest Cr(VI) removal rate was offered at optimal S/Fe molar ratio of 1/ 25 that the most chelated Fe2+ was also observed. The improved performance was due to that FeS shell with greater electronegativity could significantly accelerate the corrosion of Fe (0), facilitate the electron transfer form Fe (0) core to FeS shell according to the electrochemical tests. Moreover, FeS shell provided a protective layer for Fe (0) core so as to alleviate its anoxic passivation in water that FeS/Fe (0) had a better longevity for Cr (VI) removal than nFe (0). Characterizations of STEM and XPS revealed that Cr(VI) was reduced to Cr(III) and evenly coprecipitated with surface Fe(II)/Fe(III).

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