Liu Li, Cui Zhenghao, Feng Bo, Sui Mengjing, Huang Huaqin, Wu Zhaoyang
School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China.
Anhui International Joint Research Center for Metallurgical Processes and Systems Science, Anhui University of Technology, Maanshan 243002, China.
Materials (Basel). 2024 Sep 16;17(18):4546. doi: 10.3390/ma17184546.
In this study, novel FeO/TiO photocatalytic composites were synthesised by combining traditional oxidation roasting with the sol-gel method, using low-cost metallurgical waste (iron scales) as the raw material. The characterisation results revealed that the oxidised iron scales could be transformed into high-purity and porous FeO particles through oxidation roasting, thereby providing additional sites for the adsorption process and thus serving as an effective carrier for TiO-based photocatalytic materials. During the sol-gel process, TiO was loaded onto the synthesised FeO particles, generating core-shell heterostructure FeO/TiO photocatalytic composites. Under visible light irradiation for 90 min, the FeO/TiO photocatalytic composites achieved a remarkable methylene blue removal rate (97.71%). This reaction process followed the quasi-first-order kinetic model with a rate constant of 0.038 min. The results have demonstrated that this combination of various components in the FeO/TiO photocatalytic composites improved the adsorption, light utilisation, and charge separation effect of the photocatalysts. Moreover, the material exhibited favourable stability and recyclability, making it a decent candidate for the treatment of wastewater from the biochemical industry. Therefore, this study provides a new strategy for improving the photocatalytic activity of TiO and expanding the high value-added utilisation of iron scales.
在本研究中，采用传统氧化焙烧与溶胶-凝胶法相结合的方法，以低成本冶金废料（铁鳞）为原料，合成了新型FeO/TiO光催化复合材料。表征结果表明，氧化焙烧可将铁鳞转化为高纯度多孔FeO颗粒，从而为吸附过程提供额外位点，进而作为TiO基光催化材料的有效载体。在溶胶-凝胶过程中，TiO负载到合成的FeO颗粒上，生成核壳异质结构的FeO/TiO光催化复合材料。在可见光照射90分钟后，FeO/TiO光催化复合材料实现了显著的亚甲基蓝去除率（97.71%）。该反应过程遵循准一级动力学模型，速率常数为0.038 min⁻¹。结果表明，FeO/TiO光催化复合材料中各组分的这种组合提高了光催化剂的吸附、光利用和电荷分离效果。此外，该材料表现出良好的稳定性和可回收性，使其成为生化工业废水处理的理想候选材料。因此，本研究为提高TiO的光催化活性和扩大铁鳞的高附加值利用提供了一种新策略。
