The mechanisms of Co(II) oxidation on synthetic birnessite

Details The mechanisms of Co(II) oxidation on synthetic birnessite The mechanisms of Co(II) oxidation on synthetic birnessite

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1399c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 8, pp.1399-1403

Computer Science

2

Scientific paper

Studies of the adsorption of Co(II) on synthetic birnessite have been carried out at pH 4, 6, 7, 8 and 10. At pH values of 4, 6 and 7 cobalt(II) is oxidized to Co(III) while at pH 8 and 10 surface cobalt corresponds to Co(II). The Co(II) produced at pH 8 and 10 appears to be Co(OH) 2 produced via precipitation on the MnO 2 surface. The oxidizing agent is identified as surface Mn(IV) from a comparison of x-ray photoelectron spectroscopic results for samples prepared at pH 6.5 under anaerobic and aerobic conditions. The identification of Mn(III) is accomplished by comparing the Mn 2p core electron binding energies and the Mn 3s multiplet splitting values with the results for a variety of manganese oxides.

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