Sorption of Co ions on biogenic Mn oxides procuced by a Mn-oxidizing fungus, Paraconiothyrium sp.-like strain

K. Sasaki, M. Matsuda, T. Urata, T. Hirajima, H. Konno

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


Sorption of Co(II) on the biogenic Mn oxide produced by a Paraconiothyrium sp.-like strain was investigated. The biogenic Mn oxide, which was characterized to be poorly crystalline birnessite (Na4Mn(III) 6Mn(IV)8O27 • 9H2O) bearing Mn(III) and Mn(lV) in the structure, showed approximately 6.0-fold higher efficiency for Co(II) sorption than a synthetic Mn oxide. XP-spectra of Co 2p for the biogenic and synthetic Mn oxides after Co(II) sorption indicate that Co was immobilized as Co(III) on the surface of Mn oxides, clearly suggesting that redox reaction occurs between Co(II) ions and each Mn oxides. The Co(II) ions would be initially sorbed on the vacant sites of the surface of biogenic Mn oxide, and then oxidized to Co(III) by neighbor Mn(III/IV) atoms to release Mn(II). For the synthetic Mn oxide, release of Mn(II) was negligibly small because the oxidant is only Mn(IV) in ramsdellite (γ-MnO 2). The Mn(II) release from the biogenic Mn oxide during Co(II) adsorption would be not only from weakly bounded Mn(II), but also from redox reaction between Mn(III/IV) and Co(II) ions.

Original languageEnglish
Title of host publicationBiohydrometallurgy
Subtitle of host publicationFrom the Single Cell to the Environment
PublisherTrans Tech Publications
Number of pages4
ISBN (Print)0878494529, 9780878494521
Publication statusPublished - 2007
Event17th International Biohydrometallurgy Symposium, IBS 2007 - Frankfurt am Main, Germany
Duration: Sept 2 2007Sept 5 2007

Publication series

NameAdvanced Materials Research
ISSN (Print)1022-6680


Other17th International Biohydrometallurgy Symposium, IBS 2007
CityFrankfurt am Main

All Science Journal Classification (ASJC) codes

  • General Engineering


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