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Redox processes at surfaces of manganese oxide and their effects on aqueous metal ions

Chemical Geology

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DOI: 10.1016/0009-2541(78)90045-1

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Abstract

Mn oxides precipitated from aerated solutions of Mn2+ by raising the pH are reported in various publications to have the approximate composition Mn3O4 or MnOOH. These oxyhydroxides in turn can disproportionate to Mn2+ and MnO2 resulting in a substantial decrease in equilibrium Mn solubility. The disproportionation can catalyze the oxidation of Mn2+ and other metals by facilitating electron-transfer processes. Diversion of some electron transfers from Mn species to other metal ions can greatly decrease the equilibrium solubility of Co, Pb, Ni and some other elements in the presence of mixed-valence Mn oxides. Some scavenging and coprecipitation effects involving Mn oxides may be attributable to redox processes. Equilibrium solubilities for Mn, Co and Pb are summarized in four graphs. ?? 1978.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Redox processes at surfaces of manganese oxide and their effects on aqueous metal ions
Series title:
Chemical Geology
DOI:
10.1016/0009-2541(78)90045-1
Volume
21
Issue:
3-4
Year Published:
1978
Language:
English
Publisher:
Elsevier
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Chemical Geology
First page:
199
Last page:
218
Number of Pages:
20