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- Title
Biogenic FeS promotes dechlorination and thus de-cytotoxity of trichloroethylene.
- Authors
Nie, Zhenyuan; Wang, Na; Xia, Xu; Xia, Jinlan; Liu, Hongchang; Zhou, Yuhang; Deng, Yu; Xue, Zhen
- Abstract
Abiotic iron monosulfide (FeS) has attracted growing interests in dechlorinating trichloroethylene (TCE) in anoxic groundwater, but it is still unclear how biogenic FeS affects the dechlorination and thus the cytotoxity of TCE. In this work, a biogenic FeS was synthesized by Shewanella oneidensis MR-1 with addition of ferrihydrite and S0, and it was used for dechlorination of TCE in alkaline environment and the de-cytotoxicity was evaluated by the growth of Synechocystis sp. PCC6803. The results show that the biogenic FeS was of mackinawite, with a loose flower-like mosaic structure. The dechlorination of TCE by the biogenic FeS was accelerated by 6 times than that by abiotic FeS. TCE was dechlorinated mainly by hydrogenolysis to form dichloroethane (C2H2Cl2), vinyl chloride (C2H3Cl), and finally ethylene, accompanied with transformation of both Fe2+ to Fe3+ and monosulfide to disulfide and polysulfide on the biogenic FeS surface. The concentration for 50% of maximal inhibition effect (EC50) of TCE to Synechocystis was 486 mg/L and the inhibition to Synechocystis under the EC50 was relieved more significantly on addition of the biogenic FeS than that of abiotic FeS. These results indicate that the biogenic FeS promoted the dechlorination and thus de-cytotoxity of TCE.
- Subjects
TRICHLOROETHYLENE; SHEWANELLA oneidensis; VINYL chloride; SYNECHOCYSTIS; ETHYLCELLULOSE; POLYSULFIDES
- Publication
Bioprocess & Biosystems Engineering, 2020, Vol 43, Issue 10, p1791
- ISSN
1615-7591
- Publication type
Article
- DOI
10.1007/s00449-020-02369-7