Trabelsi Khaled, Abidi Mabrouk, Hajjaji Anouar, Tefdini Rania, Bessais Brahim, Rtimi Sami
Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia.
Laboratoire de Technologie des Poudres (LTP), Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL-STI-IMX-LTP, Station 12, CH-1015, Lausanne, Switzerland.
Environ Sci Pollut Res Int. 2023 Jan;30(4):10733-10744. doi: 10.1007/s11356-022-22923-y. Epub 2022 Sep 9.
In this work, we report on the effect of anodization time on the morphology, optical, and photocatalytic properties of TiO nanotubes (NTs) allowing bacterial inactivation and two organic pollutant degradation under low-intensity solar-simulated light. Scanning electron microscopy (SEM) showed that the length of the TiO NTs increased from 2.8 to 25.8 μm as anodization time was increased from 15 to 300 min at 60 V, respectively. The X-ray diffraction (XRD) patterns showed that all samples crystallize in the anatase phase after annealing at 400 °C for 3 h. Samples anodized for 30 and 60 min exhibit low diffuse reflection at 400 nm, which was attributed to the disorder-induced exciton scattering at the molecular level. The intensity of the photoluminescence (PL) spectra was found to increase as the length of the NTs increases up to a maximum anodization time of 300 min, revealing the contribution of bulk excitonic states. A maximum photoelectric conversion efficiency of 0.55% was obtained at a potential of - 0.5 V vs. Ag/AgCl for TiO NTs anodized for 60 min. The optimized NTs (anodized for 60 min) showed a photocatalytic bacterial inactivation of a magnitude of 6 log within 360 min and a degradation of indole and methylene blue (MB) under low-intensity solar-simulated light (50 mW/cm). The stability of the prepared catalyst was tested over several cycles.
在本工作中，我们报道了阳极氧化时间对TiO纳米管（NTs）的形貌、光学和光催化性能的影响，该纳米管在低强度太阳模拟光下可实现细菌灭活以及两种有机污染物的降解。扫描电子显微镜（SEM）显示，在60V下，随着阳极氧化时间从15分钟增加到300分钟，TiO NTs的长度分别从2.8μm增加到25.8μm。X射线衍射（XRD）图谱表明，所有样品在400℃退火3小时后均结晶为锐钛矿相。阳极氧化30分钟和60分钟的样品在400nm处表现出低漫反射，这归因于分子水平上无序诱导的激子散射。发现光致发光（PL）光谱的强度随着NTs长度增加直至最大阳极氧化时间300分钟而增加，这揭示了体激子态的贡献。对于阳极氧化60分钟的TiO NTs，在相对于Ag/AgCl为 - 0.5V的电位下获得了0.55%的最大光电转换效率。优化后的NTs（阳极氧化60分钟）在低强度太阳模拟光（50 mW/cm）下，在360分钟内显示出6个对数级的光催化细菌灭活以及吲哚和亚甲基蓝（MB）的降解。对制备的催化剂的稳定性进行了多个循环的测试。
