东南大学刘道银研究团队报道了中心管流化床原子层沉积法制备核壳纳米结构SiO₂/TiO₂光催化剂。相关研究成果于2024年1月4日发表在国际顶尖学术期刊《颗粒学报》。

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膜厚度和均匀性。

该文中，研究人员设计了一种带有中心管的流化床，其中中心管具有两个作用：改善流化和分别输送前体。以TiCl₄和H₂O为前驱体，在180°C常压下合成了核壳结构的SiO₂/TiO₂纳米颗粒催化剂，用于光降解盐酸四环素（TC）。

在振动和中心管的组合作用下，团聚物尺寸沿床层高度的偏析减弱，制备的SiO₂/TiO₂纳米粒子表现出优异的光催化降解性能：在300W氙灯照射60min下，对TC的降解效率为96%。光催化活性增强的机制是由于界面处产生的Ti-O-Si键，它增加了吸收阳光的能力，并加速了空穴和电子的分离。

附：英文原文

Title: Synthesis of core-shell nanostructured SiO2/TiO2 photocatalysts via atomic layer deposition in a fluidized bed with central tube

Author: Wei Liu, Daoyin Liu, Zuyang Zhang, Zhenkun Sun

Issue&Volume: 2024/01/04

Abstract: Fluidized bed atomic layer deposition is an efficient technique for particle coating with precise control over the film thickness and uniformity at the sub-nano scale. 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.

DOI: 10.1016/j.partic.2023.12.015

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200124000038