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

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	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 1; Jiang, Mingyu 1,2,3; Sakamoto, Fuminori 1; Kozai, Naofumi 1; Yamasaki, Shinya 1; Yu, Qianqian 1; Tanaka, Kazuya 1,4; Utsunomiya, Satoshi 2; Xia, Xiaobin 5; Yang, Ke 5
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2015-08-15
卷号	163 页码:1-13
英文摘要	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 x 10(-4) or 1.0 x 10(-5) mol L-1 Ce(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 L-III-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 (K-d) 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 x 10(-1) or 3.3 x 10(-1) g L-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. (C) 2015 Elsevier Ltd. All rights reserved.
收录类别	SCI
语种	英语
WOS记录号	WOS:000355926900001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/33052]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan 2.Kyushu Univ, Dept Chem, Fukuoka 3050801, Japan 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China 4.Hiroshima Univ, Inst Sustainable Sci & Dev, Higashihiroshima 724, Japan 5.Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China
推荐引用方式 GB/T 7714	Ohnuki, Toshihiko,Jiang, Mingyu,Sakamoto, Fuminori,et al. Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides: Effect of microbial cells on the oxidation of trivalent cerium[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2015,163:1-13.
APA	Ohnuki, Toshihiko.,Jiang, Mingyu.,Sakamoto, Fuminori.,Kozai, Naofumi.,Yamasaki, Shinya.,...&He, Jianhua.(2015).Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides: Effect of microbial cells on the oxidation of trivalent cerium.GEOCHIMICA ET COSMOCHIMICA ACTA,163,1-13.
MLA	Ohnuki, Toshihiko,et al."Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides: Effect of microbial cells on the oxidation of trivalent cerium".GEOCHIMICA ET COSMOCHIMICA ACTA 163(2015):1-13.