Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 183, Issue 3, Pages 542-546Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2009.12.020
Keywords
Ferrihydrite; Fe(II); Ammonia; Amine; Complexation; Lepidocrocite; Goethite
Funding
- Natural Science Foundation of China [20877021]
- Hebei Province [E2007000276]
- Ph.D Programs Foundation and Key Programs of Hebei Normal University [L2005815, L2007z06]
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This work examined Fe(II)-induced transformation of ferrihydnte in the presence of ammonia, amine and the coordination ions of Fe(III). Our earlier results showed that ferrihydrite transformed Into the mixture of lepidocrocite, goethite and/or hematite in the presence of trace Fe(II) and absence of ammonia and similar species However, the formation of lepidocrocite was restrained when using ammonia as precipitants. When introducing some amines (e.g ethanolamine and diethanolamine) and some coordination ions (e g. F(-) and C(2)O(4)(2-) ions) into the reaction system, a similar effect on the transformation of ferrihydrite was found. Probably, the complexes formed between Fe(III) and those additives favor the formation of goethite. At the same time, the introduction of these additives hinders Fe(II) from interacting with ferrihydrite, which makes the catalytic dissolution of ferrihydrite be limited, thus, the formation of lepidocrocite be restrained (C) 2009 Elsevier Inc All rights reserved.
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