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首页> 外文期刊>New Journal of Chemistry >Degradation of tetracycline in water using Fe3O4 nanospheres as Fenton-like catalysts: kinetics, mechanisms and pathways
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Degradation of tetracycline in water using Fe3O4 nanospheres as Fenton-like catalysts: kinetics, mechanisms and pathways

机译：使用Fe3O4纳米球作为Fenton样催化剂的水分降解水中的四环素：动力学，机制和途径

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摘要

Fe3O4 nanospheres (Fe3O4-S) synthesized via a facile one-pot solvothermal method were used for H2O2 activation and tetracycline (TC) elimination from aqueous solutions. It can be found that more than 80% of TC was degraded in the Fe3O4-S/H2O2 system. Besides, batch experiments were conducted to investigate the effects of different parameters such as catalyst dosages, H2O2 concentration, pH values and temperature on the degradation of TC, and these experimental results were also described by the pseudo-first-order model. Radical quenching experiments and an electron paramagnetic resonance (EPR) technique revealed that (OH)-O-center dot and O-center dot(2)-/(HO2)-H-center dot were involved and (OH)-O-center dot generated on the surface of Fe3O4-S played a main role in TC degradation. The XPS observations demonstrated that the surface Fe-II participated in the H2O2 activation through the redox reactions. Moreover, thirteen intermediate products were monitored by the LC-MS and possible degradation pathways of TC were accordingly proposed. The Fe3O4-S catalyst exhibited good reusability and the catalytic performance of it did not show any significant decrease even after five trials. It was worth noting that the optimal pH for TC degradation was expanded to neutral pH conditions by using the Fe3O4-S/H2O2 system. Additionally, Fe3O4-S was easily separated from the reaction solutions by virtue of its magnetism (66.8 emu g(-1)), which is beneficial for reuse of the catalysts.
机译：经由一个浅显一锅溶剂热法合成的Fe3O4纳米球（四氧化三铁-S）用于H 2 O 2活化和四环素（TC）消除从水溶液。可以发现，TC的80％以上是在四氧化三铁-S / H 2 O 2系统降解。此外，进行了批实验以研究不同的参数，如催化剂的剂量，H2O2浓度，pH值和对TC的降解温度，并且这些实验结果的影响也由伪一阶模型描述。自由基猝灭实验和电子顺磁共振（EPR）技术显示，（OH）-O-中心点和O-中心点（2） - /（HO2）-H-中心点参与和（OH）-O-中心的Fe3O4-S的表面上生成的点起到TC降解主要作用。所述XPS观察表明，表面的Fe-II通过氧化还原反应参与了H 2 O 2活化。此外，13的中间产物是由LC-MS和TC的可能降解途径监测进行了相应的提议。四氧化三铁-S催化剂具有良好的可重用性和它的催化性能，即使经过五年的试验没有显示出任何显著下降。这是值得注意的是，对于TC降解的最适pH是通过使用四氧化三铁-S / H 2 O 2系统扩展到中性pH条件下。此外，四氧化三铁-S容易从反应液由于其磁性（66.8鸸鹋克（-1）），其是对催化剂的再利用的有益分离。

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  • 来源
    《New Journal of Chemistry》 |2020年第7期|共11页
  • 作者

    Nie Mingxing; Li Yulian; He Junyong; Xie Chao; Wu Zijian; Sun Bai; Zhang Kaisheng; Kong Lingtao; Liu Jinhuai;

  • 作者单位

    Chinese Acad Sci Inst Intelligent Machines Nanomat &

    Environm Detect Lab Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Intelligent Machines Nanomat &

    Environm Detect Lab Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Intelligent Machines Nanomat &

    Environm Detect Lab Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Intelligent Machines Nanomat &

    Environm Detect Lab Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Intelligent Machines Nanomat &

    Environm Detect Lab Hefei 230031 Peoples R China;

    Anhui Jianzhu Univ Coll Environm &

    Energy Engn Key Lab Water Pollut Control &

    Wastewater Resourc Hefei 230601 Peoples R China;

    Chinese Acad Sci Inst Intelligent Machines Nanomat &

    Environm Detect Lab Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Intelligent Machines Nanomat &

    Environm Detect Lab Hefei 230031 Peoples R China;

    Chinese Acad Sci Inst Intelligent Machines Nanomat &

    Environm Detect Lab Hefei 230031 Peoples R China;

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