Fluidized bed atomic layer deposition is an efficient technique for particle coating with precise control over the film thickness and uniformity at the sub-nanoscale. In this study, a fluidized bed with a central tube is designed, where the central tube has two roles: improve fluidization and deliver precursors separately. The synthesis of core-shell structured SiO₂/TiO₂ nanoparticle catalysts for photodegradation of tetracycline hydrochloride (TC) is carried out using TiCl₄ and H₂O as precursors at 180 °C under atmospheric pressure. Under the combination of vibration and central tube, the segregation of agglomerate size along the bed height is weakened, and the prepared SiO₂/TiO₂ nanoparticles show excellent photocatalytic degradation performance: the degradation efficiency on TC is 96% under 300 W xenon lamp irradiation for 60 min. The mechanism of enhanced photocatalytic activity is due to the Ti-O-Si bonds generated at the interface, which increase the ability to absorb sunlight and accelerate the separation of holes and electrons.

流化床原子层沉积是一种有效的颗粒涂层技术，可以精确控制亚纳米级的薄膜厚度和均匀性。本研究设计了带有中心管的流化床，其中中心管有两个作用：改善流化和分别输送前驱体。_{以TiCl 4}和H ₂ O为前驱体，在180℃、常压下合成了核壳结构的SiO ₂ /TiO ₂纳米颗粒催化剂，用于光降解盐酸四环素(TC)。在振动与中心管的结合下，团聚体尺寸沿床高的偏析减弱，所制备的SiO ₂ /TiO ₂纳米粒子表现出优异的光催化降解性能：300 W氙灯照射下对TC的降解效率为96% 60分钟。增强光催化活性的机制是由于界面处生成的Ti-O-Si键，增加了吸收阳光的能力并加速了空穴和电子的分离。