Journal
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
Volume 135, Issue -, Pages 6-12Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2014.03.017
Keywords
Aerated zone soil; Uranium; Biosorption mechanism; Bacillus sp dwc-2
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Funding
- China National Natural Science Foundation [21071102, 91126013]
- China National Natural Science Foundation
- China Academy of Engineering Physics (NSAF) [U1330125]
- National Fund of China for Fostering Talents in Basic Science [J1210004]
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In this paper, the biosorption mechanisms of uranium on an aerobic Bacillus sp. dwc-2, isolated from a potential disposal site for (ultra-) low uraniferous radioactive waste in Southwest China, was explored by transmission electron microscopy (TEM), energy dispersive X-ray (EDX) analysis, FT-IR spectroscopy, proton induced X-ray emission (PIXE) and enhanced proton bacicscattering spectrometry (EPBS). The biosorption experiments for uranium were carried out at a low pH (pH 3.0), where the uranium solution speciation is dominated by highly mobile uranyl ions. The bioaccumulation was found to be the potential mechanism involved in uranium biosorption by Bacillus sp. dwc-2, and the bioaccumulated uranium was deposited in the cell interior as needle shaped particles at pH 3.0, as revealed by TEM analysis as well as EDX spectra. FTIR analysis further suggested that the absorbed uranium was bound to amino, phosphate and carboxyl groups of bacterial cells. Additionally, PIXE and EPBS results confirmed that ion-exchange also contributed to the adsorption process of uranium. All the results implied that the biosorption mechanism of uranium on Bacillus sp. is complicated and at least involves bioaccumulation, ion exchange and complexation process. (C) 2014 Elsevier Ltd. All rights reserved.
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