Thermodynamic stability of CoOOH and its coprecipitation with manganese

Details Thermodynamic stability of CoOOH and its coprecipitation with manganese Thermodynamic stability of CoOOH and its coprecipitation with manganese

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..801h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 49, Issue 3, pp.801-810

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Scientific paper

A precipitate of cobalt oxyhydroxides formed by bubbling oxygen through a dilute solution of Co(NO 3 ) 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. Co 3 O 4 and CoOOH were identified in the precipitate by X-ray diffraction. Chemical equilibria involving these solids were evaluated by measurements of solution pH and Co 2+ activities and by redox potential measurements and gave a G coOOH 0 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 MnOOH, MnO 2 (birnessite) and CoOOH.

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