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Biogenic FeS promotes dechlorination and thus de-cytotoxity of trichloroethylene.
Bioprocess and Biosystems Engineering ( IF 3.8 ) Pub Date : 2020-05-18 , DOI: 10.1007/s00449-020-02369-7
Zhenyuan Nie 1, 2 , Na Wang 1 , Xu Xia 1 , Jinlan Xia 1, 2 , Hongchang Liu 1, 2 , Yuhang Zhou 1 , Yu Deng 1 , Zhen Xue 1
Affiliation  

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.

中文翻译:

生物成因的FeS促进三氯乙烯的脱氯作用,从而促进三氯乙烯的去细胞毒作用。

非生物单硫化铁(FeS)在缺氧地下水中对三氯乙烯(TCE)脱氯引起了越来越多的兴趣,但是目前尚不清楚生物源性FeS如何影响TCE的脱氯和细胞毒性。在这项工作中,由Shewanella oneidensis MR-1加入亚铁水合物和S0合成了一种生物FeS,并将其用于碱性环境中TCE的脱氯,并通过Synechocystis sp。的生长评估了其脱细胞毒性。PCC6803。结果表明,成因的FeS为麦基钠长石,具有疏松的花状镶嵌结构。生物源性FeS对TCE的脱氯比非生物性FeS加速了6倍。TCE主要通过氢解脱氯形成二氯乙烷(C2H2Cl2),氯乙烯(C2H3Cl),最后是乙烯,伴随着Fe2 +转化为Fe3 +以及单硫化物在生物FeS表面转化为二硫化物和多硫化物。TCE对集胞藻的最大抑制作用(EC50)的50%浓度为486 mg / L,添加生物源性FeS的效果比非生物FeS显着减轻了EC50下对集胞藻的抑制作用。这些结果表明,生物FeS促进了TCE的脱氯并因此促进了TCE的去细胞毒作用。
更新日期:2020-05-18
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