This paper aims to synthesize and describe BiFeO₃/TiO₂ nanocomposite with enhanced visible-light activity. At first, BiFeO₃ nanoparticles were successfully synthesized by the thermal treatment method, and then titania nanoparticles were prepared by hydrolysis precipitation process. Composite nanoparticles were synthesized at different ratios of ferrite to titania. To characterize the nanocomposites’ structure, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Brunauer–Emmett–Teller analysis were applied. The UV–visible diffuse reflectance spectra showed that redshift in the absorption spectra of the nanocomposites was significantly related to the ratio of ferrite to titania. Moreover, the photocatalytic activity of the nanocomposites was researched under visible light, discussing Congo red dye degradation. The best result was obtained by the BiFeO₃/TiO₂ (1:1), which the photocatalytic degradation efficiency reached 60% after 30 min of irradiation. PL spectroscopy was applied as a practical technique to examine the separation efficiency of the photogenerated carrier pairs. The accordance between PL and photocatalytic results showed vital role of the constructed heterojunction in the nanocomposites to prevent the charge carrier recombination. Also, the synthesized BiFeO₃/TiO₂ (1:1) nanocomposite showed a suitable reusability in the model pollutant treatment.

本文旨在合成和描述具有增强可见光活性的BiFeO ₃ /TiO ₂纳米复合材料。起初，BiFeO ₃通过热处理法成功合成了纳米粒子，然后通过水解沉淀法制备了二氧化钛纳米粒子。复合纳米粒子以不同的铁氧体与二氧化钛的比例合成。为了表征纳米复合材料的结构，应用了扫描电子显微镜、透射电子显微镜、X 射线衍射和 Brunauer-Emmett-Teller 分析。紫外可见漫反射光谱表明纳米复合材料吸收光谱的红移与铁氧体与二氧化钛的比例显着相关。此外，在可见光下研究了纳米复合材料的光催化活性，讨论了刚果红染料的降解。最好的结果是由 BiFeO ₃ /TiO ₂(1:1)，照射 30 分钟后光催化降解效率达到 60%。PL 光谱被用作一种实用的技术来检查光生载流子对的分离效率。PL 和光催化结果之间的一致性表明，构建的异质结在纳米复合材料中对防止电荷载流子复合起着至关重要的作用。此外，合成的 BiFeO ₃ /TiO ₂ (1:1) 纳米复合材料在模型污染物处理中显示出合适的可重复使用性。