Oxidation of tungstate-containing green rust (Cl -) in aqueous solution

K. Shinoda, S. Fujieda, S. Tsuri, S. Suzuki

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The influence of tungstate on the oxidation of green rust [GR(Cl -)], which contains both Fe(II) and Fe(III), was investigated by synthesizing suspensions of GR(Cl -) containing tungstate and oxidizing them via injection of N 2 gas containing O 2. XRD and TEM analyses were used for characterizing the solid particles formed during synthesis and oxidation. The results showed that the formation of fine α-FeOOH was enhanced by the addition of tungstate to the GR(Cl -) suspensions, while GR(Cl -) without tungstate was transformed primarily into Î 3-FeOOH. The pH, oxidation-reduction potential (ORP), and dissolved oxygen (DO) values of the aqueous solution were measured during oxidation of GR(Cl -) with and without tungstate. The results showed that whereas the pH value of the solution was decreased and the ORP value was increased monotonically by oxidation of GR(Cl -), the pH and ORP values during oxidation the GR(Cl -) suspension containing tungstate revealed characteristic changes with time. XAS was also used for characterizing the chemical state and local structure of tungstate in the oxidized particles. The results indicated that the local structure of WO42- was essentially retained in the particles precipitated from GR(Cl -) suspensions.

Original languageEnglish
Pages (from-to)343-349
Number of pages7
JournalMaterials and Corrosion
Volume63
Issue number4
DOIs
Publication statusPublished - 2012 Apr 1

Keywords

  • X-ray absorption spectroscopy
  • X-ray diffraction
  • green rust
  • iron oxyhydroxide
  • oxidation
  • tungstate

ASJC Scopus subject areas

  • Environmental Chemistry
  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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