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Retention mechanisms and microstructure of Eu(III) on manganese dioxide studied by batch and high resolution EXAFS technique
Sheng, GD; Yang, ST; Li, YM; Gao, X; Huang, YY; Hu, J; Wang, XK; xkwang@ipp.ac.cn
2014
Source PublicationRADIOCHIMICA ACTA
ISSN0033-8230
Volume102Issue:42006Pages:155—167
AbstractThe batch experiment and high resolution EXAFS technique with bent crystal analyzer were combined to study Eu(III) retention mechanisms on beta-MnO2 as a function of various environmental factors. The results indicated that the sorption of Eu(III) onto beta-MnO2 was obviously dependent on pH but independent of ionic strength, suggesting the formation of inner-sphere surface complexes. Results of high resolution EXAFS analysis showed that Eu was surrounded by 8 +/- 1 O atoms in the first shell at REu-O approximate to 2.40 angstrom for all sorption samples. A second shell of Mn atoms at REu-Mn approximate to 3.78 angstrom was observed for all sorption samples, which was associated with the formation of a bidendate inner-sphere complex with chemical bonding via edge sharing to MnO6-octahedron. This study shows the utility of high resolution EXAFS technique with bent crystal analyzer to discriminate the fluorescence peak of Eu(III) from that of manganese hydroxides, whose fluorescence peaks are too close in energy to be discriminated by the conventional EXAFS technique with a low resolving solid-state detector. Both the macroscopic interaction data and the molecular level evidence of Eu(III) surface speciation at the oxide-water interface should be factored into better evaluation of Eu(III) and related radionuclide mobility in the natural environment.
KeywordAdsorption-desorption Reversibility Ray-absorption Spectroscopy Oxide Minerals Manganite Metal-ion Coordination Biogenic Mn-oxides Gamma-mnooh Humic-acid Arsenite Oxidation Na-montmorillonite Europium Retention
Indexed BySCI
Language英语
WOS IDWOS:000331141200017
Citation statistics
Cited Times:60[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/14363
Collection中科院上海应用物理研究所2011-2019年
Corresponding Authorxkwang@ipp.ac.cn
Recommended Citation
GB/T 7714
Sheng, GD,Yang, ST,Li, YM,et al. Retention mechanisms and microstructure of Eu(III) on manganese dioxide studied by batch and high resolution EXAFS technique[J]. RADIOCHIMICA ACTA,2014,102(42006):155—167.
APA Sheng, GD.,Yang, ST.,Li, YM.,Gao, X.,Huang, YY.,...&xkwang@ipp.ac.cn.(2014).Retention mechanisms and microstructure of Eu(III) on manganese dioxide studied by batch and high resolution EXAFS technique.RADIOCHIMICA ACTA,102(42006),155—167.
MLA Sheng, GD,et al."Retention mechanisms and microstructure of Eu(III) on manganese dioxide studied by batch and high resolution EXAFS technique".RADIOCHIMICA ACTA 102.42006(2014):155—167.
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