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首页> 外文期刊>RSC Advances >Simultaneous bacterial inactivation and degradation of an emerging pollutant under visible light by ZnFe2O4 co-modified with Ag and rGO
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Simultaneous bacterial inactivation and degradation of an emerging pollutant under visible light by ZnFe2O4 co-modified with Ag and rGO

机译：Ag和rGO共修饰的ZnFe 2 O 4 在可见光下同时灭活和降解新兴污染物

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Herein, we investigated the simultaneous photoinactivation of E. coli and degradation of an endocrine disrupting compound, 17α-ethinyl estradiol (EE2), by the ZnFe2O4–Ag/rGO nanocomposite. In a pure bacterial suspension, inactivation of log?7.2 was achieved in 60 min with 250 mg L?1 loading of ZnFe2O4–Ag/rGO; however, when EE2 was present in the suspension, complete inactivation of the bacteria was achieved only after 210 min of treatment with a 500 mg L?1 loading of ZnFe2O4–Ag/rGO. Results obtained from the bacterial membrane injury test, SEM, FTIR, and antioxidant enzyme activities indicated that resilience of E. coli decreased against the oxidative stress induced by the photocatalyst, outstripping the bacterial defense mechanism and subsequently decomposing the constituent macromolecules, ultimately causing bacterial inactivation. Scavenging experiment for different active species indicated that H2O2 played the most important role for bacterial inactivation and OH˙ played the most important role for EE2 degradation, showing that the roles of the active species were dissimilar for microbial inactivation and organic pollutant degradation. Bacterial inactivation was significantly affected by the presence of EE2. Thus, the antibacterial study of the photocatalysts in this system needs to be carried out with more specificity.
机译：在本文中，我们研究了 E的同时光灭活。菌并通过ZnFe 2 O 4 –Ag / rGO纳米复合材料。在纯细菌悬浮液中，用250 mg L ？1 负载的ZnFe 2 在60分钟内灭活了log？7.2。 O 4 –Ag / rGO;但是，当悬浮液中存在EE2时，仅在以500 mg L ？1 ZnFe 负载处理210分钟后，细菌才能完全灭活。 2 O 4 –Ag / rGO。从细菌膜损伤试验，SEM，FTIR和抗氧化酶活性获得的结果表明 E具有回弹力。大肠杆菌抵抗光催化剂诱导的氧化应激而降低，超过了细菌防御机制，随后分解了大分子，最终导致细菌失活。不同活性物种的清除实验表明，H 2 O 2 在细菌灭活和OH方面起着最重要的作用。 for在EE2降解中起着最重要的作用，表明活性物种在微生物灭活和有机污染物降解中的作用不同。 EE2的存在会严重影响细菌的失活。因此，该系统中的光催化剂的抗菌研究需要更加特异性。

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