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Hydrogen

Sulfidation Boosts Reactivity and Longevity of Zero-Valent Iron in Groundwater Remediation

Strategic Insights

— 1 min read

Researchers at the University of Natural Resources and Applied Life Science in Vienna, Austria, have made a significant discovery in the field of groundwater remediation. According to their study, published in the journal Langmuir, sulfidation represents a promising approach to increase the reactivity, selectivity, and longevity of zero-valent iron (ZVI) in groundwater remediation applications.

The study, which employed density functional theory, investigated how sulfidation affects the formation, stability, mobility, and recombination of atomic hydrogen (H*) at ZVI surfaces. The findings revealed that sulfidation suppresses water adsorption and H* formation via water dissociation, while also weakening H* adsorption affinity on ZVI. However, surface oxidation, which occurs when sulfidation is not sufficient, hinders H* adsorption and promotes H* recombination.

Key Takeaways:

  • Sulfidation represents a promising approach to increase the reactivity, selectivity, and longevity of ZVI in groundwater remediation applications.
  • The study employed density functional theory to investigate how sulfidation affects H* formation, stability, mobility, and recombination at ZVI surfaces at atomic resolution.
  • Sulfidation suppresses water adsorption and H* formation via water dissociation, while also weakening H* adsorption affinity on ZVI.
  • Surface oxidation, which occurs when sulfidation is not sufficient, hinders H* adsorption and promotes H* recombination.
  • S-ZVI with moderate S coverage retains more reduced Fe sites, which are favorable for H* adsorption, compared to the corroded ZVI surface.
  • Adsorbed H* at the reduced Fe sites exhibits restricted mobility near S atoms, limiting H* recombination and increasing its availability for contaminant degradation.
  • The research concluded with implications for the role of H*-mediated reactions in ZVI-S systems.

Statistics:

  • The study was conducted by researchers at the University of Natural Resources and Applied Life Science in Vienna, Austria.
  • The research was published in the journal Langmuir, volume and page number not specified.
  • The authors employed density functional theory to investigate the effects of sulfidation on H* formation, stability, mobility, and recombination at ZVI surfaces.
  • The study focused on the role of H* retention at S-ZVI surfaces with moderate S coverage.

Sources:

  • Researchers at University of Natural Resources and Applied Life Science Describe Findings in Science (Mechanism of Increased Retention of Atomic Hydrogen on Moderately Sulfidated Zero-Valent Iron Surfaces).
  • Chemicals & Chemistry. October 24, 2025; p 3905.
  • Langmuir. 2025.
  • American Chemical Society - www.acs.org.
  • Langmuir - www.pubs.acs.org/journal/langd5.

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