Murcia Julie J, Ávila-Martínez Elsa G, Rojas Hugo, Cubillos Jairo, Ivanova Svetlana, Penkova Anna, Laguna Oscar H
Grupo de Catálisis de la Universidad Pedagógica y Tecnológica de Colombia, Avenida Central del Norte 39-115, Tunja 150003, Colombia.
Departamento de Química Inorgánica / Universidad de Sevilla and Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla-CSIC, Avenida Américo Vespucio, 49, 41092 Seville, Spain.
Nanomaterials (Basel). 2019 Apr 2;9(4):517. doi: 10.3390/nano9040517.
In this study, titanium dioxide powder obtained by the sol-gel method and TiO₂ nanotubes, were prepared. In order to increase the TiO₂ photoactivity, the powders and nanotubes obtained were modified by dye sensitization treatment during the oxide synthesis. The sensitizers applied were Quinizarin (Q) and Zinc protoporphyrin (P). The materials synthesized were extensively characterized and it was found that the dye sensitization treatment leads to modify the optical and surface properties of Titania. It was also found that the effectiveness of the dye-sensitized catalysts in the phenol and methyl orange (MO) photodegradation strongly depends on the dye sensitizer employed. Thus, the highest degradation rate for MO was obtained over the conventional Q-TiO₂ photocatalyst. In the case of the nanotubes series, the most effective photocatalyst in the MO degradation was based on TiO₂-nanotubes sensitized with the dye protoporfirin (ZnP). Selected catalysts were also tested in the phenol and MO photodegradation under visible light and it was observed that these samples are also active under this radiation.
在本研究中，制备了通过溶胶 - 凝胶法获得的二氧化钛粉末和二氧化钛纳米管。为了提高二氧化钛的光活性，在氧化物合成过程中，通过染料敏化处理对所得的粉末和纳米管进行改性。所应用的敏化剂为茜素（Q）和锌原卟啉（P）。对合成的材料进行了广泛表征，发现染料敏化处理导致二氧化钛的光学和表面性质发生改变。还发现染料敏化催化剂在苯酚和甲基橙（MO）光降解中的有效性强烈依赖于所采用的染料敏化剂。因此，在传统的Q - TiO₂光催化剂上获得了甲基橙的最高降解率。在纳米管系列中，在甲基橙降解中最有效的光催化剂是基于用染料原卟啉（ZnP）敏化的TiO₂纳米管。还在可见光下对选定的催化剂进行了苯酚和甲基橙光降解测试，观察到这些样品在这种辐射下也具有活性。
