Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 48, Issue 24, Pages 14599-14606Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es504587s
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Funding
- National Research Foundation of Korea [NRF: 2010-0029224]
- Basic Science Research Program through the National Research Foundation of Korea, Ministry of Education, Science & Technology, Republic of Korea [NRF: 2012R1A1A2043811]
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Industrial effluents constitute a major source of metal pollution of aquatic bodies. Moreover, due to their environmental persistence, toxic metal pollution is of special concern. Microbial reduction is considered a promising strategy for toxic metal removal among the several methods available for metal remediation. Here, we describe the coremediation of toxic Cr(VI) and Te(IV) by the dissimilatory metal reducing bacterium-Shewanella oneidensis MR-1. In the presence of both Cr(VI) and Te(IV), S. oneidensis MR-1 reduced Cr(VI) to the less toxic Cr(III) form, but not Te(IV) to Te(0). The reduced Cr(III) ions complexed rapidly with Te(IV) ions and were precipitated from the cell cultures. Electron microscopic analyses revealed that the CrTe complexed nanoparticles localized on the bacterial outer membranes. K-edge X-ray absorption spectrometric analyses demonstrated that Cr(III) produced by S. oneidensis MR-1was rapidly complexed with Te(IV) ions, followed by formation of amorphous Cr(III)Te(IV) nanoparticles on the cell surface. Our results could be applied for the simultaneous sequestration and detoxification of both Cr(VI) and Te(IV) as well as for the preparation of nanomaterials through environmental friendly processes.
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