In situ measurements of X-ray absorption spectra during transformation of green rust to ferric oxyhydroxide via aqueous solution

Shun Fujieda, Aya Yoshino, Kozo Shinoda, Yohei Takahashi, Shigeru Suzuki

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In situ measurements of X-ray absorption spectra at an Fe K absorption edge were carried out during the transformation of chloride-containing green rust (GR(Cl-)) to oxyhydroxide (that is, lepidocrocite (γ - FeOOH)), by oxidation via aqueous solution. Results showed that the Fe K absorption edge in X-ray absorption near-edge structure (XANES) spectrum shifted toward the higher energy side with increasing oxidation time. The factor analysis of the XANES spectra, using reference data, implied that dissolution of GR(Cl -) and precipitation of γ -FeOOH occur simultaneously. The fraction of γ -FeOOH in the suspension increased continuously with increasing oxidation time, in response to the continuous decrease of the fraction of GR(Cl-). The results lead us to conclude that GR(Cl -) transforms to γ -FeOOH during oxidation under the present experimental conditions.

Original languageEnglish
Pages (from-to)125-130
Number of pages6
JournalIsij International
Volume54
Issue number1
DOIs
Publication statusPublished - 2014 Feb 26

Keywords

  • Corrosion
  • EXAFS
  • Lepidocrocite
  • XANES

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'In situ measurements of X-ray absorption spectra during transformation of green rust to ferric oxyhydroxide via aqueous solution'. Together they form a unique fingerprint.

  • Cite this