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Infrared spectroscopy of ferrihydrite: evidence for the presence of structural hydroxyl groups
Abstract
IR spectroscopy has shown that adsorbed water is almost completely removed from ferrihydrite by evacuation at room temperature. Absorption bands at 3615 and 3430 cm−1 appearing thereafter are interpreted as arising from OH groups located respectively at the surface and deeper in the structure. These groups are readily converted to OD on treatment with D 2 O vapour and this has allowed the OH deformation vibration to be identified at 800 cm−1. It is proposed that OH groups in ferrihydrite are about half as numerous as those in akaganéite (β-FeOOH) and that they may occur in environments similar to those in this mineral. The formula for ferrihydrite proposed by earlier workers, 5 Fe 2 O 3.9H 2 O, should thus be amended to Fe 2 O 3. 2 FeOOH.2·6H 2 O in order to indicate the presence of structural OH groups. A re-appraisal of the ferrihydrite structure appears desirable.
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Cited by
Occurrence and Constitution of Natural and Synthetic Ferrihydrite, a Widespread Iron Oxyhydroxide
Jambor, J. L., & Dutrizac, J. E. (1998) · Chemical Reviews · doi:10.1021/cr970105t · Cited by 916
Parfitt, R., & Childs, C. (1988) · Australian Journal of Soil Research · doi:10.1071/sr9880121 · Cited by 549
Size-dependent structural transformations of hematite nanoparticles. 1. Phase transition
Chernyshova, I. V., Hochella Jr, M. F., & Madden, A. S. (2007) · Physical Chemistry Chemical Physics · doi:10.1039/b618790k · Cited by 463
Zachara, J. M., Kukkadapu, R. K., Fredrickson, J. K., Gorby, Y. A., & Smith, S. C. (2002) · Geomicrobiology Journal · doi:10.1080/01490450252864271 · Cited by 364
Metadata
- Authors
- Russell, J. D.
- Venue
- Clay Minerals
- Publisher
- Mineralogical Society
- Published
- 1979-06
- Volume
- 14
- Issue
- 2
- Pages
- 109-114
- ISSN
- 0009-8558 (ISSN-L)
- 1471-8030
- OpenAlex
- W2070437815
- Cited by
- 196
- References
- 0
- FWCI
- 3.10
- Type
- journal article
- Language
- en
- Open access
- closed
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