In this study, the liquid phase deposition of flower-like TiO₂ microspheres were decorated by ZIF-8 nanoparticles, forming the ZIF-8/TiO₂ composite materials. The results showed that the ZIF-8 nanoparticles can be well-deposited on the surface of TiO₂ microspheres with a porous microstructure. The photocatalytic activity of the as-prepared materials were evaluated by the degradation of methylene blue (MB) and rhodamine B (RhB) solutions. It revealed that the ZIF-8/TiO₂ composite materials exhibited the enhanced photocatalytic activity, of which the photodegradation rate of MB and RhB solutions with initial concentration of 10 mg/L can reach approximately 90% under illumination for 40 min. Moreover, the reactive species trapping experiments indicated that ·OH was the main active species during the photodegradation process in this system. The enhanced photocatalytic activity of ZIF-8/TiO₂ composite materials was attributed to the synergistic effect between the TiO₂ microspheres and ZIF-8 nanoparticles, which resulted in the increased specific surface area and the reduced recombination of photogenerated charge carriers.

在这项研究中，ZIF-8纳米粒子修饰了花状TiO ₂微球的液相沉积，形成了ZIF-8 / TiO ₂复合材料。结果表明，ZIF-8纳米颗粒可以很好地沉积在具有多孔微结构的TiO ₂微球表面上。通过亚甲基蓝（MB）和若丹明B（RhB）溶液的降解来评估所制备材料的光催化活性。结果表明ZIF-8 / TiO ₂复合材料表现出增强的光催化活性，其中初始浓度为10 mg / L的MB和RhB溶液在光照下40分钟可达到约90％的光降解率。此外，反应性物种捕获实验表明，·OH是该体系光降解过程中的主要活性物种。ZIF-8 / TiO ₂复合材料的光催化活性增强归因于TiO ₂微球与ZIF-8纳米颗粒之间的协同作用，从而导致比表面积增加和光生电荷载流子的复合减少。