Volume 17 Issue 3
Sep.  2024
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Article Navigation >  Water Science and Engineering  > 2024  >  17(3): 249-256
Xiu-juan Feng, Xiao-yi Wang, Dong-ming Li, Zhi-han Liu, Yue-long Yan. 2024: Sulfidation of nano zero-valent iron for enhanced hexavalent chromium removal performance. Water Science and Engineering, 17(3): 249-256. doi: 10.1016/j.wse.2023.12.001
Citation: Xiu-juan Feng, Xiao-yi Wang, Dong-ming Li, Zhi-han Liu, Yue-long Yan. 2024: Sulfidation of nano zero-valent iron for enhanced hexavalent chromium removal performance. Water Science and Engineering, 17(3): 249-256. doi: 10.1016/j.wse.2023.12.001
shu

Sulfidation of nano zero-valent iron for enhanced hexavalent chromium removal performance

doi: 10.1016/j.wse.2023.12.001

  • a. School of Mines, China University of Mining and Technology, Xuzhou 221116, China;

  • b. Rare Earth Research Institute, China University of Mining and Technology, Xuzhou 221116, China;

  • c. School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China;

  • d. Mechano Chemistry Research Institute, China University of Mining and Technology, Xuzhou 221116, China;

  • e. School of Civil and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Nanchang 341000, China

Funds:

This work was supported by the National Key Research and Development Program of China (Grants No. 2018YFC1801800, 2019YFC1805600, 2021YFC2902701, and 2021YFC2902100), the Shandong Provincial Major Science and Technology Innovation Project (Grant No. 2021CXGC011206), and the Key Project of the National Natural Science Foundation of China (Grant No. 52130402).

  • Received Date: 2022-10-29
  • Accepted Date: 2023-11-14
    • Available Online: 2024-08-24
    Abstract
  • Nano zero-valent iron (nZVI) and sulfidation-modified nZVI (S-nZVI) were synthesized and used to remove hexavalent chromium (Cr(VI)) in wastewater. Characterization of the products showed that the sulfidation process significantly changed the morphology of nZVI, with enhanced crystallinity. The effects of S/Fe ratio, pH value, and reaction temperature on Cr(VI) removal were studied. A S/Fe ratio of 0.5 was the most appropriate parameter, with a removal efficiency of 98% in the condition of pH = 2. The effects of anions (Cl-, NO3-, CO32-, and SO42-) and cations (Ca2+ and Mg2+) on the Cr(VI) removal efficiency were investigated, and the relevant mechanisms were discussed. The Cr(VI) removal efficiency of S-nZVI was significantly greater than that of nZVI, mainly owing to the existence of FeS layers that could protect Fe0 cores and prompt electron transfer. The aging and cycling experiments showed that S-nZVI could maintain its reactivity when facing the corrosion of water, and showed cycling stability. Thus, S-nZVI is an effective and feasible agent for the remediation of Cr(VI)-contained wastewater.

     

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