Journal
ENZYME AND MICROBIAL TECHNOLOGY
Volume 95, Issue -, Pages 236-241Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2016.09.013
Keywords
Biogenic; Ferrous sulfide (FeS); Shewanalla putrefaciens; Dechlorination; Carbon tetrachloride
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Funding
- National Nature Science Foundation of China [51278479, 311431203]
- National 863 Project [2011AA060901]
- Hundred-Talent Program of Chinese Academy of Sciences
- Program for Changjiang Scholars and Innovative Research Team in University
- Fundamental Research Funds for the Central Universities [wk2060190040]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Hong Kong University Grants Committee Area of Excellence Scheme [AoE/P-03-08]
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Dissimilatory metal reducing bacteria (DMRB) widely exist in the subsurface environment and are involved in various contaminant degradation and element geochemical cycling processes. Recent studies suggest that DMRB can biosynthesize metal nanoparticles during metal reduction, but it is unclear yet how such biogenic nanomaterials would affect their decontamination behaviors. In this study, we found that the dechlorination rates of carbon tetrachloride (CT) by Shewanella putrefaciens CN32 was significantly increased by 8 times with the formation of biogenic ferrous sulfide (FeS) nanoparticles. The pasteurized biogenic FeS enabled 5 times faster dechlorination than abiotic FeS that had larger sizes and irregular structure, confirming a significant contribution of the biogenic FeS to CT bioreduction resulting from its good dispersion and relatively high dechlorination activity. This study highlights a potentially important role of biosynthesized nanoparticles in environmental bioremediation. (C) 2016 Elsevier Inc. All rights reserved.
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