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Instantaneous oxidation of levofloxacin as toxic pharmaceutical residuals in water using clay nanotubes decorated by ZnO (ZnO/KNTs) as a novel photocatalyst under visible light source.
Journal of Environmental Management ( IF 8.7 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.jenvman.2020.111019
Mostafa R Abukhadra 1 , Ashraf Helmy 2 , Mohamed F Sharaf 3 , Mohammed A El-Meligy 4 , Ahmed Tawhid Ahmed Soliman 3
Affiliation  

Kaolinite nanotubes were synthesized by a simple scrolling process and decorated by ZnO nanoparticles as a novel nanocomposite (ZnO/KNTs). The synthetic ZnO/KNTs composite was characterized as an effective photocatalyst in the oxidation of levofloxacin pharmaceutical residuals in the water resources. The composite displays a surface area of 95.4 m2/g, average pore diameter of 5.8 nm, and bandgap energy of 2.12 eV. It is of high catalytic activity in the oxidation of levofloxacin in the presence of visible light source. The complete oxidation for 10 mg/L of levofloxacin was recognized after 55 min, 45 min, and 30 min with applying 30 mg, 40 mg, and 50 mg of ZnO/KNTs as catalyst dosage, respectively. Additionally, it achieved complete oxidation for 20 mg/L and 30 mg/L of levofloxacin after 45 min and 75 min, respectively using 50 mg as catalyst dosage. The degradation efficiency was confirmed by detecting the residual TOC after the treatment tests and the formed intermediate compounds were identified to suggest the degradation pathways. In addition to the oxidation pathway, the mechanism was evaluated based on the active trapping tests that proved the dominance of hydroxyl radicals as the essential active species. Finally, the ZnO/KNTs composite is of promising recyclability properties and achieved better results than several studied photocatalysts in literature.



中文翻译:

使用可见光光源下由ZnO装饰的粘土纳米管(ZnO / KNTs)作为新型光催化剂,将左氧氟沙星瞬时氧化为水中的有毒药物残留物。

高岭石纳米管通过简单的滚动过程合成,并用ZnO纳米颗粒修饰为新型纳米复合材料(ZnO / KNTs)。合成的ZnO / KNTs复合材料被表征为一种有效的光催化剂,用于氧化左氧氟沙星药物残留在水资源中。该复合材料的表面积为95.4 m 2/ g,平均孔径为5.8 nm,带隙能量为2.12 eV。在可见光源的存在下,它对左氧氟沙星的氧化具有很高的催化活性。在分别使用30 mg,40 mg和50 mg ZnO / KNTs作为催化剂剂量后,分别在55分钟,45分钟和30分钟后,可以识别出10 mg / L左氧氟沙星的完全氧化。此外,使用50 mg的催化剂剂量分别在45分钟和75分钟后,分别对20 mg / L和30 mg / L的左氧氟沙星实现了完全氧化。通过在处理测试后检测残留的TOC来确认降解效率,并确定形成的中间化合物以提示降解途径。除了氧化途径,该机理是根据活性捕获试验评估的,该试验证明了羟基自由基是必不可少的活性物质。最后,ZnO / KNTs复合材料具有良好的可回收性,并且比几种文献中研究过的光催化剂具有更好的效果。

更新日期:2020-06-30
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