Synthesis of core-shell nanostructured SiO2/TiO2 photocatalysts via atomic layer deposition in a fluidized bed with central tube--颗粒学报PARTICUOLOGY

Liu, W., Liu, D., Zhang, Z., & Sun, Z. (2024). Synthesis of core-shell nanostructured SiO2/TiO2 photocatalysts via atomic layer deposition in a fluidized bed with central tube. Particuology, 91, 19-28. https://doi.org/10.1016/j.partic.2023.12.015

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

Wei Liu, Daoyin Liu^*, Zuyang Zhang, Zhenkun Sun

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy & Environment, Southeast University, Nanjing 210096, China

10.1016/j.partic.2023.12.015

Volume 91, August 2024, Pages 19-28

Received 18 October 2023, Revised 18 December 2023, Accepted 22 December 2023, Available online 4 January 2024, Version of Record 23 January 2024.

E-mail: dyliu@seu.edu.cn

Highlights

• Combination of vibration and central tube improves nanoparticle fluidization.

• SiO₂/TiO₂ photocatalysts are prepared by atomic layer deposition in a fluidized bed with a central tube.

• SiO₂/TiO₂ photocatalysts exhibit superior photocatalytic performance.

• h⁺ is identified to be a more dominant active species in photocatalytic reaction.

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-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.

Graphical abstract

Keywords

SiO₂/TiO₂ nanoparticles; Fluidization; Atomic layer deposition; Photocatalysts; Photocatalytic mechanism

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