Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides: Effect of microbial cells on the oxidation of trivalent cerium

Toshihiko Ohnuki, Mingyu Jiang, Fuminori Sakamoto, Naofumi Kozai, Shinya Yamasaki, Qianqian Yu, Kazuya Tanaka, Satoshi Utsunomiya, Xiaobin Xia, Ke Yang, Jianhua He

Research output: Contribution to journalArticle

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Abstract

Sorption of Ce by mixtures of synthetic Mn oxides and microbial cells of Pseudomonas fluorescens was investigated to elucidate the role of microorganisms on Ce(III) oxidative migration in the environment. The mixtures, upon which Ce was sorbed following exposure to solutions containing 1.0×10-4 or 1.0×10-5molL-1Ce(III), were analyzed by scanning electron microscopy energy dispersive X-ray spectroscopy (SEM-EDS) and micro-X-ray fluorescence (micro-XRF) at synchrotron facilities. A Ce LIII-edge micro XANES spectra analysis was also performed to determine the oxidation states of Ce adsorbed to the Mn oxides and microbial cells in the mixtures. The distribution ratios (Kd) of Ce between the individual solids and solution increased with increasing pH of the solution, and was nearly the same in mixtures containing varying amounts of microbial cells. SEM-EDS and micro-XRF analyses showed that Ce was sorbed by both MnO2 and microbial cells (1.7×10-1 or 3.3×10-1gL-1). In addition, nano-particles containing Ce and P developed on the surface of the microbial cells. XANES analysis showed that lower fractions of Ce(III) were oxidized to Ce(IV) in the mixtures containing greater amounts of microbial cells. Micro-XANES analysis revealed that Ce was present as Ce(III) on the microbial cells and as Ce(IV) on Mn oxides. These results strongly suggest that the association of Ce(III) with the microbial cell surface and the formation of Ce phosphate nano-particles are responsible for suppressing the oxidation of Ce(III) to Ce(IV) in the mixtures.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalGeochimica et Cosmochimica Acta
Volume163
DOIs
Publication statusPublished - Aug 5 2015

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Cerium
cerium
manganese oxide
Sorption
sorption
oxide
X-ray fluorescence
oxidation
Oxidation
X-ray spectroscopy
scanning electron microscopy
Oxides
energy
microorganism
Fluorescence
phosphate
X rays
Scanning electron microscopy
Synchrotrons
Microorganisms

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides : Effect of microbial cells on the oxidation of trivalent cerium. / Ohnuki, Toshihiko; Jiang, Mingyu; Sakamoto, Fuminori; Kozai, Naofumi; Yamasaki, Shinya; Yu, Qianqian; Tanaka, Kazuya; Utsunomiya, Satoshi; Xia, Xiaobin; Yang, Ke; He, Jianhua.

In: Geochimica et Cosmochimica Acta, Vol. 163, 05.08.2015, p. 1-13.

Research output: Contribution to journalArticle

Ohnuki, Toshihiko ; Jiang, Mingyu ; Sakamoto, Fuminori ; Kozai, Naofumi ; Yamasaki, Shinya ; Yu, Qianqian ; Tanaka, Kazuya ; Utsunomiya, Satoshi ; Xia, Xiaobin ; Yang, Ke ; He, Jianhua. / Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides : Effect of microbial cells on the oxidation of trivalent cerium. In: Geochimica et Cosmochimica Acta. 2015 ; Vol. 163. pp. 1-13.
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abstract = "Sorption of Ce by mixtures of synthetic Mn oxides and microbial cells of Pseudomonas fluorescens was investigated to elucidate the role of microorganisms on Ce(III) oxidative migration in the environment. The mixtures, upon which Ce was sorbed following exposure to solutions containing 1.0×10-4 or 1.0×10-5molL-1Ce(III), were analyzed by scanning electron microscopy energy dispersive X-ray spectroscopy (SEM-EDS) and micro-X-ray fluorescence (micro-XRF) at synchrotron facilities. A Ce LIII-edge micro XANES spectra analysis was also performed to determine the oxidation states of Ce adsorbed to the Mn oxides and microbial cells in the mixtures. The distribution ratios (Kd) of Ce between the individual solids and solution increased with increasing pH of the solution, and was nearly the same in mixtures containing varying amounts of microbial cells. SEM-EDS and micro-XRF analyses showed that Ce was sorbed by both MnO2 and microbial cells (1.7×10-1 or 3.3×10-1gL-1). In addition, nano-particles containing Ce and P developed on the surface of the microbial cells. XANES analysis showed that lower fractions of Ce(III) were oxidized to Ce(IV) in the mixtures containing greater amounts of microbial cells. Micro-XANES analysis revealed that Ce was present as Ce(III) on the microbial cells and as Ce(IV) on Mn oxides. These results strongly suggest that the association of Ce(III) with the microbial cell surface and the formation of Ce phosphate nano-particles are responsible for suppressing the oxidation of Ce(III) to Ce(IV) in the mixtures.",
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T1 - Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides

T2 - Effect of microbial cells on the oxidation of trivalent cerium

AU - Ohnuki, Toshihiko

AU - Jiang, Mingyu

AU - Sakamoto, Fuminori

AU - Kozai, Naofumi

AU - Yamasaki, Shinya

AU - Yu, Qianqian

AU - Tanaka, Kazuya

AU - Utsunomiya, Satoshi

AU - Xia, Xiaobin

AU - Yang, Ke

AU - He, Jianhua

PY - 2015/8/5

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N2 - Sorption of Ce by mixtures of synthetic Mn oxides and microbial cells of Pseudomonas fluorescens was investigated to elucidate the role of microorganisms on Ce(III) oxidative migration in the environment. The mixtures, upon which Ce was sorbed following exposure to solutions containing 1.0×10-4 or 1.0×10-5molL-1Ce(III), were analyzed by scanning electron microscopy energy dispersive X-ray spectroscopy (SEM-EDS) and micro-X-ray fluorescence (micro-XRF) at synchrotron facilities. A Ce LIII-edge micro XANES spectra analysis was also performed to determine the oxidation states of Ce adsorbed to the Mn oxides and microbial cells in the mixtures. The distribution ratios (Kd) of Ce between the individual solids and solution increased with increasing pH of the solution, and was nearly the same in mixtures containing varying amounts of microbial cells. SEM-EDS and micro-XRF analyses showed that Ce was sorbed by both MnO2 and microbial cells (1.7×10-1 or 3.3×10-1gL-1). In addition, nano-particles containing Ce and P developed on the surface of the microbial cells. XANES analysis showed that lower fractions of Ce(III) were oxidized to Ce(IV) in the mixtures containing greater amounts of microbial cells. Micro-XANES analysis revealed that Ce was present as Ce(III) on the microbial cells and as Ce(IV) on Mn oxides. These results strongly suggest that the association of Ce(III) with the microbial cell surface and the formation of Ce phosphate nano-particles are responsible for suppressing the oxidation of Ce(III) to Ce(IV) in the mixtures.

AB - Sorption of Ce by mixtures of synthetic Mn oxides and microbial cells of Pseudomonas fluorescens was investigated to elucidate the role of microorganisms on Ce(III) oxidative migration in the environment. The mixtures, upon which Ce was sorbed following exposure to solutions containing 1.0×10-4 or 1.0×10-5molL-1Ce(III), were analyzed by scanning electron microscopy energy dispersive X-ray spectroscopy (SEM-EDS) and micro-X-ray fluorescence (micro-XRF) at synchrotron facilities. A Ce LIII-edge micro XANES spectra analysis was also performed to determine the oxidation states of Ce adsorbed to the Mn oxides and microbial cells in the mixtures. The distribution ratios (Kd) of Ce between the individual solids and solution increased with increasing pH of the solution, and was nearly the same in mixtures containing varying amounts of microbial cells. SEM-EDS and micro-XRF analyses showed that Ce was sorbed by both MnO2 and microbial cells (1.7×10-1 or 3.3×10-1gL-1). In addition, nano-particles containing Ce and P developed on the surface of the microbial cells. XANES analysis showed that lower fractions of Ce(III) were oxidized to Ce(IV) in the mixtures containing greater amounts of microbial cells. Micro-XANES analysis revealed that Ce was present as Ce(III) on the microbial cells and as Ce(IV) on Mn oxides. These results strongly suggest that the association of Ce(III) with the microbial cell surface and the formation of Ce phosphate nano-particles are responsible for suppressing the oxidation of Ce(III) to Ce(IV) in the mixtures.

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