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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：ZnFe2O4与AG和RGO共同修饰的可见光下可见光下出现污染物的同时细菌灭活和降解

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摘要

Herein, we investigated the simultaneous photoinactivation of E. coli and degradation of an endocrine disrupting compound, 17 alpha-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 center dot 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：在此，我们研究了ZnFe2O4-Ag / Rgo纳米复合材料的同时的Coli和内分泌破坏化合物，17个α-乙炔雌二醇（EE2）的劣化。在纯细菌悬浮液中，在60分钟内实现Log 7.2的灭活，ZnFe2O4-Ag / Rgo的250mg L-1负载;然而，当EE2存在于悬浮液中时，只有在210分钟的处理后，才能完成细菌的完全失活，用500mg L-1加载ZnFe2O4-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. Coli的抵抗力降低了光催化剂诱导的氧化应激，将细菌防御机制出来并随后将组成大分子分解，最终导致细菌灭活。清除不同活性物种的实验表明，H2O2对细菌失活的最重要作用，OH中心点对EE2降解发挥的最重要作用，表明活性物种的作用对于微生物灭活和有机污染物降解不同。通过EE2存在显着影响细菌失活。因此，需要用更多的特异性进行该系统中光催化剂的抗菌研究。

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  • 来源
    《RSC Advances》 |2017年第43期|共10页
  • 作者

    Khadgi Nirina; Upreti Akhanda Raj; Li Yi;

  • 作者单位

    Hohai Univ Coll Environm Minist Educ Key Lab Integrated Regulat &

    Resource Dev Shallow Nanjing 210098 Jiangsu Peoples R China;

    Hohai Univ Coll Environm Minist Educ Key Lab Integrated Regulat &

    Resource Dev Shallow Nanjing 210098 Jiangsu Peoples R China;

    Hohai Univ Coll Environm Minist Educ Key Lab Integrated Regulat &

    Resource Dev Shallow Nanjing 210098 Jiangsu Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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