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
2014 ISIJ International  
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
more » ... 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.
doi:10.2355/isijinternational.54.125 fatcat:p3zy6cldfrbsnfrilszdytrmha