Flower-like TiO 2 Nanostructures Coated with Fe 3 O 4 Nanoparticles as Magnetic Ohmic Heterojunctions for the Photocatalytic Selective Oxidative Coupling of Primary Amines and Degradation of Tetracycline

作者：Zhen Li, Xuemei Li, Chang Liu, Xingjie Xue, Jing An, Lei Shi, Xing Yang, Dongni Yin, Dong Jin Yoo, Shuxiang Lü · 发表于：ACS Applied Nano Materials · 年份：2025 · DOI：10.1021/acsanm.5c00429 · 被引用次数：9 · 研究领域：Advanced Photocatalysis Techniques、TiO2 Photocatalysis and Solar Cells、Copper-based nanomaterials and applications

Semiconductor-based photoredox catalysis is emerging as a green and promising strategy for solar–chemical energy conversion in organic synthesis and environmental treatment. Here, a hierarchical marigold-like magnetic Fe 3 O 4 /TiO 2 composite was designed and prepared as an efficient and magnetically recyclable photocatalyst for selective oxidative coupling of primary amines and the degradation of tetracycline. Compared with its single-phase counterparts, the enhanced photocatalytic activity of composite can be assigned to its compositional and structural features. The formation of hierarchical Fe 3 O 4 /TiO 2 Ohmic heterojunction can not only improve the light absorption and separation of photoinduced charge carriers but also provide more photoredox active sites. Furthermore, the Fe 3+ /Fe 2+ cycle of Fe 3 O 4 in the composite can facilitate the generation of reactive intermediates ( • O 2– ) in the photocatalytic system, which can greatly promote photocatalytic performance. In addition, the magnetic Fe 3 O 4 /TiO 2 heterojunction enables easy recycling by using an external magnet and demonstrates excellent reusability.