ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Sorption of Co(II) on the biogenic Mn oxide produced by a Paraconiothyrium sp.-likestrain was investigated. The biogenic Mn oxide, which was characterized to be poorly crystallinebirnessite (Na4Mn(III)6Mn(IV)8O27 ·9H2O) bearing Mn(III) and Mn(IV) in the structure, showedapproximately 6.0-fold higher efficiency for Co(II) sorption than a synthetic Mn oxide. XP-spectraof Co 2p for the biogenic and synthetic Mn oxides after Co(II) sorption indicate that Co wasimmobilized as Co(III) on the surface of Mn oxides, clearly suggesting that redox reaction occursbetween Co(II) ions and each Mn oxides. The Co(II) ions would be initially sorbed on the vacantsites 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 smallbecause the oxidant is only Mn(IV) in ramsdellite (γ-MnO2). The Mn(II) release from the biogenicMn oxide during Co(II) adsorption would be not only from weakly bounded Mn(II), but also fromredox reaction between Mn(III/IV) and Co(II) ions
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.607.pdf
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