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Report No.

Sorption of Sr$$^{2+}$$ into Mn oxides produced by MnO$$_{4}$$$$^{-}$$ reduction using biomass

Kato, Tomoaki ; Onuki, Toshihiko; Yu, Q.

Various radionuclides were released into seawater by the accident of the Fukushima Daiichi Nuclear Power Plant. We need to establish techniques to eliminate such radionuclides from the contaminated seawater. Mn oxides are known to sorb various metal ions. Mn oxides can be produced by reduction of MnO$$_{4}$$$$^{-}$$ using biomass (biomass-MnOX) although there is little information on metal uptake mechanisms during the formation of biomass-MnOX. In this research, we investigated the uptake of Sr$$^{2+}$$ during the formation of biomass-MnOX produced by reduction of KMnO$$_{4}$$ with cells of Pseudomonas fluorescens. After inoculating the cells into the Mn(VII) and Sr$$^{2+}$$ containing solution, blackish precipitates were formed in the bottom. EXAFS analysis of Sr$$^{2+}$$ in the precipitates showed that the presence of Mn around Sr, indicating that Sr was formed inner-sphere complex with Mn during coprecipitation.



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