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首页> 外文期刊>RSC Advances >Goethite–titania composite: disinfection mechanism under UV and visible light
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Goethite–titania composite: disinfection mechanism under UV and visible light

机译：针铁矿-二氧化钛复合材料：在紫外线和可见光下的消毒机理

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Goethite–titania (α-FeOOH–TiO _(2) ) 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. α-FeOOH–TiO _(2) composites and TiO _(2) -P25, as reference, were evaluated as photocatalysts for the disinfection of Escherichia coli under UV or visible light in a stirred tank reactor. α-FeOOH–TiO _(2) exhibited better photocatalytic activity in the visible region than TiO _(2) -P25. The mechanical activation increased the absorption in the visible range of TiO _(2) -P25 and the photocatalytic activity of α-FeOOH–TiO _(2) . In the experiments with UV light and α-FeOOH–TiO _(2) , mechanically activated, a 5.4?log-reduction of bacteria was achieved after 240 min of treatment. Using visible light the α-FeOOH–TiO _(2) and the TiO _(2) -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针铁矿-二氧化钛（α-FeO​​OH-TiO_（2））复合材料。分别通过X射线粉末衍射，扫描电子显微镜和UV-Vis漫反射光谱对合成后的复合材料的结构，形态和光学性能进行了表征。以α-FeO​​OH-TiO_（2）复合材料和TiO _（2）-P25作为参考，在搅拌釜反应器中作为紫外线或可见光消毒大肠杆菌的光催化剂进行了评估。 α-FeO​​OH-TiO_（2）在可见光区的光催化活性高于TiO _（2）-P25。机械活化增加了TiO _（2）-P25可见光范围内的吸收和α-FeO​​OH-TiO_（2）的光催化活性。在紫外线和α-FeO​​OH-TiO_（2）的实验中，经过机械活化，经过240分钟的处理，细菌的数量减少了5.4log。使用可见光，α-FeO​​OH-TiO_（2）和TiO_（2）-P25在240分钟时分别显示3.1和0.7？log的减少。通过ROS检测和清除剂实验研究了其消毒机理，表明消毒过程中产生的主要ROS为超氧自由基阴离子，单线态氧和羟基自由基。

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