Thermodynamic stability of CoOOH and its coprecipitation with manganese
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Abstract
A precipitate of cobalt oxyhydroxides formed by bubbling oxygen through a dilute solution of Co(NO3)2 held at pH 9.0 and 25°C was aged for 23 months in contact with the original solution, with access to atmospheric oxygen. Co3O4 and CoOOH were identified in the precipitate by X-ray diffraction. Chemical equilibria involving these solids were evaluated by measurements of solution pH and Co2+ activities and by redox potential measurements and gave a ΔGcoOOH0 of −92.3 ± 0.5 kcal/mole. This value and other thermodynamic data show relative feasibility of hypothetical reaction steps and changes in reaction paths during automated coprecipitation titrations and subsequent aging of a precipitate that finally contained βMnOOH, MnO2 (birnessite) and CoOOH.
Publication type | Article |
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Publication Subtype | Journal Article |
Title | Thermodynamic stability of CoOOH and its coprecipitation with manganese |
Series title | Geochimica et Cosmochimica Acta |
DOI | 10.1016/0016-7037(85)90173-5 |
Volume | 49 |
Issue | 3 |
Year Published | 1985 |
Language | English |
Publisher | Elsevier |
Contributing office(s) | Toxic Substances Hydrology Program |
Description | 10 p. |
First page | 801 |
Last page | 810 |
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