Comparison study on transformation of iron oxyhydroxides: Based on theoretical and experimental data

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

OSTI ID:21580171

Bin, Lu ^[1]; Hui, Guo; Ping, Li ^[2]; Denglu, Hou ^[1]

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1. College of Physics Science and Information Engineering, Hebei Normal University, Shijiazhuang 050016 (China)
2. College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050016 (China)

We have investigated the catalytic transformation of ferrihydrite, feroxyhyte, and lepidocrocite in the presence of Fe(II). In this paper, the transformation from akaganeite and goethite to hematite in the presence of trace Fe(II) was studied in detail. The result indicates that trace Fe(II) can accelerate the transformation of akaganeite and goethite. Compared with the transformation of other iron oxyhydroxides (e.g., ferrihydrite, feroxyhyte, lepidocrocite, and akaganeite), a complete transformation from goethite to hematite was not observed in the presence of Fe(II). On the basis of our earlier and present experimental results, the transformation of various iron oxyhydroxides was compared based on their thermodynamic stability, crystalline structure, transformation mechanism, and transformation time. - Graphical abstract: The transformation of various iron oxyhydroxides in the presence of trace Fe(II) was compared based on experimental results, thermodynamic stability, crystalline structure, and transformation mechanism. Highlights: > Fe(II) can accelerate the transformation from akaganeite to hematite. > Small particles of goethite can transform to hematite in the presence of Fe(II). > Some hematite particles were found to be embedded within the crystal of goethite. > The relationship between structure and transformation mechanism was revealed.

• OSTI ID: 21580171
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 8 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
COMPARATIVE EVALUATIONS
ELEMENTS
EVALUATION
GOETHITE
HEMATITE
IRON
IRON ORES
METALS
MINERALS
ORES
OXIDE MINERALS
PARTICLES
STABILITY
TRANSFORMATIONS
TRANSITION ELEMENTS