Characterization of formation and oxidation of green rust (Cl-) suspension

Futoshi Nagata, Katsuya Inoue, Kozo Shinoda, Shigeru Suzuki

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Green rust (GR) containing both ferrous (Fe(ll)) and ferric (Fe(lll)) ions is formed in an aqueous solution with a relatively low electrochemical potential. In this study, in order to understand the formation and oxidation of GR, a suspension of GR containing chloride ions (GR(CD) was synthesized and subsequently oxidized by injecting nitrogen gas containing oxygen under different conditions. X-ray diffraction (XRD) measurements were performed for identifying the solid particles formed under different conditions. The results show that the GR(CI) suspension was formed from specific concentrations of hydroxyl, ferrous, and ferric ions. The pH values and oxidation-reduction potential (ORP) of the aqueous solution were measured during oxidation of the GR(CI) suspension. It was observed that because of oxygen injection, GR(CI) was transformed into iron oxides such as α-FeOOH, γ-FeOOH, and Fe 304. These iron oxide and oxyhydroxide species formed by oxidation were dependent on the oxidation conditions such as temperature. This suggested that conditions of aqueous solution are crucial for the transformation of GR(CI) into different iron oxides and oxyhydroxides.

Original languageEnglish
Pages (from-to)1730-1735
Number of pages6
JournalIsij International
Volume49
Issue number11
DOIs
Publication statusPublished - 2009

Keywords

  • Copper
  • Green rust
  • Iron oxyhydroxide
  • Oxidation
  • Reduction
  • X-ray absorption spectroscopy
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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