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Properties of Goethites of Varying Crystallinity
Abstract
Goethites were synthesized from ferrihydrite in 0.7 M KOH between 4° and 90°C. As temperatures increased, the goethite crystals became larger and of less domainic character, and surface areas decreased from 153 to 9 m 2 /g. Surface area, oxalate-soluble Fe to total Fe ratios, chemisorbed water, Mössbauer parameters, and dissolution rate in 6 M HCl at 25°C are particle-size controlled, whereas mean crystallite dimensions, a -dimension of the unit cell, differences between the two OH-bending modes, and dehydroxylation temperatures suggest the existence of a low-temperature (high- a -dimension) and a high-temperature (low- a -dimension) goethite, with a narrow transition range at a synthesis temperature of 40°–50°C. Hydrothermal treatment at 125°–180°C of a low-temperature goethite led to a healing of the multidomainic, microporous high- a -dimension goethite into a monodomainic low- a -dimension goethite of similar overall crystal size with the properties of a low- a -dimension goethite.
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Citations
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
Mechanisms of Selenate Adsorption on Iron Oxides and Hydroxides
Peak, D., & Sparks, D. L. (2002) · Environmental Science & Technology · doi:10.1021/es0156643 · Cited by 336
Zachara, J. M., Fredrickson, J. K., Li, S.-M., Kennedy, D. W., Smith, S. C., & Gassman, P. L. (1998) · American Mineralogist · doi:10.2138/am-1998-11-1232 · Cited by 325
Mutual effects of cadmium and phosphate on their adsorption and desorption by goethite
Wang, K., & Xing, B. (2004) · Environmental Pollution · doi:10.1016/s0269-7491(03)00262-8 · Cited by 95
Studies of Cd(II)–sulfate interactions at the goethite–water interface by ATR-FTIR spectroscopy
Zhang, G. Y., & Peak, D. (2007) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2006.12.020 · Cited by 78
Metadata
- Authors
- Schwertmann, U., Cambier, P., & Murad, E.
- Venue
- Clays and Clay Minerals
- Publisher
- Cambridge University Press (CUP)
- Published
- 1985-10
- Volume
- 33
- Issue
- 5
- Pages
- 369-378
- ISSN
- 0009-8604 (ISSN-L)
- 1552-8367
- OpenAlex
- W2102606018
- Cited by
- 280
- References
- 0
- FWCI
- 11.69
- Type
- journal article
- Language
- en
- Open access
- closed
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