In situ Measurements of X-ray Absorption Spectra during Transformation of Green Rust to Ferric Oxyhydroxide Via Aqueous Solution

被引：3

作者：

Fujieda, Shun ^{[1
]}

Yoshino, Aya ^{[1
]}

Shinoda, Kozo ^{[1
]}

Takahashi, Yohei ^{[2
]}

Suzuki, Shigeru ^{[1
]}

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan

[2] Nissan Arc Ltd, Dept Res, Yokosuka, Kanagawa 2370061, Japan

来源：

ISIJ INTERNATIONAL | 2014年 / 54卷 / 01期

关键词：

XANES; EXAFS; corrosion; lepidocrocite; LOCAL-STRUCTURE; OXIDATION; IRON; CARBONATE; CORROSION; PRODUCTS; CHLORIDE; IONS; FERRIHYDRITE; SUSPENSIONS;

D O I：

10.2355/isijinternational.54.125

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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 (gamma-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 gamma-FeOOH occur simultaneously. The fraction of gamma-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 gamma-FeOOH during oxidation under the present experimental conditions.

引用

页码：125 / 130

页数：6

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