Structure of Biogenic Uraninite Produced by Shewanella oneidensis Strain MR-1

被引：109

作者：

Schofield, Eleanor J. ^{[1
]}

Veeramani, Harish ^{[2
]}

Sharp, Jonathan O. ^{[2
,5
]}

Suvorova, Elena ^{[2
]}

Bernier-Latmani, Rizlan ^{[2
]}

Mehta, Apurva ^{[1
]}

Stahlman, Jonathan ^{[1
]}

Webb, Samuel M. ^{[1
]}

Clark, David L. ^{[3
]}

Conradson, Steven D.

Ilton, Eugene S. ^{[4
]}

Bargar, John R. ^{[1
]}

机构：

[1] Stanford Synchrotron Radiat Lab, Menlo Pk, CA 94025 USA

[2] Ecole Polytech Fed Lausanne, Environm Microbiol Lab, CH-1015 Lausanne, Switzerland

[3] Los Alamos Natl Lab, Seaborg Inst Transactinium Sci, ADSMS, Los Alamos, NM 87545 USA

[4] Pacific NW Natl Lab, Richland, WA 99352 USA

[5] Colorado Sch Mines, Golden, CO 80401 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2008年 / 42卷 / 21期

基金：

美国国家卫生研究院;

关键词：

D O I：

10.1021/es800579g

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The stability of biogenic uraninite with respect to oxidation is seminal to the success of in situ bioreduction strategies for remediation of subsurface U(VI) contamination. The properties and hence stability of uraninite are dependent on its size, structure, and composition. In this study,the local-, intermediate-, and long-range molecular-scale structure of nanoscale uraninite produced by Shewanella oneidensis strain MR-1 was investigated using EXAFS, SR-based powder diffraction and TEM. The uraninite products were found to be structurally homologous with stoichiometric UO2 under all conditions considered. Significantly, there was no evidence for lattice strain of the biogenic uraninite nanoparticles. The fresh nanoparticles were found to exhibit a well-ordered interior core of diameter ca. 1.3 nm and an outer region of thickness ca similar to 0.6 nm in which the structure is locally distorted. The lack of nanoparticle strain and structural homology with stoichiometric UO2 suggests that established thermodynamic parameters for the latter material are an appropriate starting point to model the behavior of nanobiogenic uraninite. The detailed structural analysis in this study provides an essential foundation for subsequent investigations of environmental samples.

引用

页码：7898 / 7904

页数：7

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