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Mechanistic Consideration of Zinc Ion Removal by Zero-Valent Iron

Abstract

Mechanism of zinc iron removal by zero-valent iron was discussed through zinc removal responses to several operational conditions of a packed column reactor with zero-valent iron powder. The adsorption isotherm observed implied that a kind of chemisorption was responsible for zinc removal. Zinc removal by zero-valent iron was enhanced by dissolved oxygen and ferric ion addition. However, it was deteriorated under acidic pH. In addition, zinc adsorbed on zero-valent iron was eluted by a reducing agent such as citric acid, whereas the zinc was not eluted by diluted sulfuric acid. Consequently, the zinc removal mechanism by zero-valent iron was inferred to be as follows: Zero-valent iron was firstly corroded and oxidized into ferric ion by dissolved oxygen. The ferric ion was precipitated as iron hydroxide onto the surface of the zero-valent iron powder. Zinc ion was adsorbed on and/or coprecipitated with the iron hydroxide. The iron hydroxide was finally oxidized and transformed into iron oxides.

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Correspondence to Naoyuki Kishimoto.

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Kishimoto, N., Iwano, S. & Narazaki, Y. Mechanistic Consideration of Zinc Ion Removal by Zero-Valent Iron. Water Air Soil Pollut 221, 183–189 (2011). https://doi.org/10.1007/s11270-011-0781-1

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  • DOI: https://doi.org/10.1007/s11270-011-0781-1

Keywords

  • Zero-valent iron
  • Zinc
  • Adsorption
  • Co-precipitation
  • Corrosion
  • Dissolved oxygen