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Research Article

Polar solvent induced in-situ self-assembly and oxygen vacancies on Bi2MoO6 for enhanced photocatalytic degradation of tetracycline

Fangyan Liu1,2,§, Dongyue Su1,§, Weizhen Liu3, Baiquan Liu1, Chuan Liu1, Hong Wang2( ), Mengye Wang2( )
State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, China
School of Materials, Sun Yat-Sen University, Shenzhen 518107, China
School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou 510006, China

§ Fangyan Liu and Dongyue Su contributed equally to this work.

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Graphical Abstract

Ethylene glycol (EG)-mediated strategy promoted in-situ self-assembly of Bi2MoO6 nanosheets with oxygen vacancies that could be manipulated by regulating the EG concentration, which showed a suitable band structure to form reactive oxygen species to degrade tetracycline.

Abstract

It has been proved to be an effective route to efficiently ameliorate photocatalytic performance of catalysts via designing three-dimensional (3D) hierarchical nanostructures and constructing oxygen vacancies (VOs). However, controlling the self-assembly of organization into 3D hierarchical nanostructures while introducing VOs in photocatalysts remains a challenge. Herein, we reported an ethylene glycol (EG) mediated approach to craft 3D hydrangea-structure Bi2MoO6 with VOs for efficient photocatalytic degradation of tetracycline. Through manipulating the EG concentration during the fabrication process, the influence of EG concentration on the Bi2MoO6 structure was systematically investigated. EG could promote the self-assembly of Bi2MoO6 nanosheets to form a 3D hierarchical structure. Compared with 2D nanoplates, 3D hierarchical architecture enhanced the surface area and the amount of active sites of Bi2MoO6. In addition, the reduction effect of EG on metallic oxide enabled the generation of VOs in Bi2MoO6. The VOs adjusted the electronic structure of Bi2MoO6, which not only enhanced the light harvesting, but also facilitated the simultaneous utilization of photo-induced electrons and holes to form reactive oxygen species (·O2− and ·OH) for the efficient tetracycline decomposition. 3D Bi2MoO6 hydrangea with VOs achieved a 79.4% removal efficiency of tetracycline after 75 min. This work provides a simple yet robust EG-mediated strategy, which not only promotes the self-assembly of nano-catalysts into 3D hierarchical architectures, but also crafts tunable VOs for highly efficient photocatalysis.

Keywords

three-dimensional (3D) hierarchical nanostructurestunable oxygen vacanciesethylene glycol (EG)-mediated strategybismuth molybdatephotocatalytic degradation tetracycline

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Nano Research
Volume 17 Issue 6,
June 2024
Pages 4951-4960
DOI: 10.1007/s12274-024-6498-4
Cite this article:
Liu F, Su D, Liu W, et al. Polar solvent induced in-situ self-assembly and oxygen vacancies on Bi2MoO6 for enhanced photocatalytic degradation of tetracycline. Nano Research, 2024, 17(6): 4951-4960. https://doi.org/10.1007/s12274-024-6498-4
Topics:
Photocatalytic activity

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Received: 28 November 2023
Revised: 05 January 2024
Accepted: 18 January 2024
Published: 02 March 2024
© Tsinghua University Press 2024
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