title: Biogenic FeS accelerates reductive dechlorination of carbon tetrachloride by Shewanella putrefaciens CN32.
abstract: 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.
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China; Advanced Laboratory for Environmental Research & Technology (ALERT), USTC-CityU, Suzhou 215123, China; Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China.
authors.forename: Ying-Chao
authors.initials: YC
authors.lastname: Huo
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China; Advanced Laboratory for Environmental Research & Technology (ALERT), USTC-CityU, Suzhou 215123, China. Electronic address: wwli@ustc.edu.cn.
authors.forename: Wen-Wei
authors.initials: WW
authors.lastname: Li
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China; Advanced Laboratory for Environmental Research & Technology (ALERT), USTC-CityU, Suzhou 215123, China.
authors.forename: Chang-Bin
authors.initials: CB
authors.lastname: Chen
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China; Advanced Laboratory for Environmental Research & Technology (ALERT), USTC-CityU, Suzhou 215123, China.
authors.forename: Chen-Xuan
authors.initials: CX
authors.lastname: Li
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, China; Advanced Laboratory for Environmental Research & Technology (ALERT), USTC-CityU, Suzhou 215123, China.
authors.forename: Raymond
authors.initials: R
authors.lastname: Zeng
authors.affiliation: Advanced Laboratory for Environmental Research & Technology (ALERT), USTC-CityU, Suzhou 215123, China; Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China.
authors.forename: Tai-Chu
authors.initials: TC
authors.lastname: Lau
authors.affiliation: School of Environment, Suzhou University of Science and Technology, Suzhou, Jiangsu, 215011, China.
authors.forename: Tian-Yin
authors.initials: TY
authors.lastname: Huang
mesh_terms: D001673:Biodegradation, Environmental; D001709:Biotechnology; D002251:Carbon Tetrachloride / Q000378:metabolism*; D005296:Ferrous Compounds / Q000737:chemistry* / Q000378:metabolism*; D055772:Green Chemistry Technology; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology; D010084:Oxidation-Reduction; D020614:Shewanella putrefaciens / Q000378:metabolism*
chemical_list: D005296:Ferrous Compounds; D002251:Carbon Tetrachloride; C022597:ferrous sulfide
keywords: Biogenic; Carbon tetrachloride; Dechlorination; Ferrous sulfide (FeS); Shewanalla putrefaciens