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Goethite-titania composite: disinfection mechanism under UV and visible light

机译：甲酸酯 - 二氧化钛复合材料：紫外线和可见光下的消毒机制

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摘要

Goethite-titania (alpha-FeOOH-TiO2) composites were prepared by co-precipitation and mechanical milling. The structural, morphological and optical properties of as-synthesized composites were characterized by X-ray powder diffraction, scanning electron microscopy and UV-Vis diffuse reflectance spectroscopy, respectively. alpha-FeOOH-TiO2 composites and TiO2-P25, as reference, were evaluated as photocatalysts for the disinfection of Escherichia coli under UV or visible light in a stirred tank reactor. alpha-FeOOH-TiO2 exhibited better photocatalytic activity in the visible region than TiO2-P25. The mechanical activation increased the absorption in the visible range of TiO2-P25 and the photocatalytic activity of alpha-FeOOH-TiO2. In the experiments with UV light and alpha-FeOOH-TiO2, mechanically activated, a 5.4 log-reduction of bacteria was achieved after 240 min of treatment. Using visible light the a-FeOOH-TiO2 and the TiO2-P25 showed a 3.1 and a 0.7 log-reductions at 240 min, respectively. The disinfection mechanism was studied by ROS detection and scavenger experiments, demonstrating that the main ROS produced in the disinfection process were superoxide radical anion, singlet oxygen and hydroxyl radical.
机译：通过共沉淀和机械研磨制备碎片 - 二氧化钛（alpha-feoh-TiO2）复合材料。通过X射线粉末衍射，扫描电子显微镜和UV-VI扩散反射光谱分析的结构，形态和光学性质。作为参考的Alpha-FeOh-TiO2复合材料和TiO2-P25被评估为光催化剂，用于在搅拌釜反应器中的UV或可见光下对大肠杆菌的消毒。 Alpha-FeOh-TiO2在可见区域中表现出比TiO2-P25更好的光催化活性。机械活化增加了TiO2-P25的可见范围和α-FeO​​OH-TiO2的光催化活性的吸收。在用UV光和α-FeO​​H-TiO 2的实验中，机械活化，在240分钟后达到5.4次逻辑减少的细菌。使用可见光分别在240分钟时显示3.1和0.7降低的3.1和0.7对数。通过ROS检测和清除剂研究研究了消毒机制，证明了消毒过程中产生的主要RO是超氧基自由基阴离子，单线氧和羟基。

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  • 来源
    《RSC Advances》 |2019年第5期|共7页
  • 作者

    Lara-Rico Rosalina; Muzquiz-Ramos Elia M.; Lopez-Badillo Claudia M.; Garcia-Perez Ulises M.; Cruz-Ortiz Brenda R.;

  • 作者单位

    Univ Autonoma Coahuila Fac Ciencias Quim Blvd V Carranza S-N Col Republ Ote Saltillo 25280 Coahuila Mexico;

    Univ Autonoma Coahuila Fac Ciencias Quim Blvd V Carranza S-N Col Republ Ote Saltillo 25280 Coahuila Mexico;

    Univ Autonoma Coahuila Fac Ciencias Quim Blvd V Carranza S-N Col Republ Ote Saltillo 25280 Coahuila Mexico;

    Univ Autonoma Nuevo Leon Fac Ingn Mecan &

    Elect Ctr Invest &

    Innovac Ingn Aeronaut Carretera Salinas Victoria Km 2-3 Apodaca Mexico;

    Univ Autonoma Coahuila Fac Ciencias Quim Blvd V Carranza S-N Col Republ Ote Saltillo 25280 Coahuila Mexico;

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  • 正文语种 eng
  • 中图分类 化学;
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