期刊
APPLIED SURFACE SCIENCE
卷 565, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150534
关键词
Flower-like structure; Z-scheme heterojunction; Visible-light photodegradation; Antibacterial activities; AgBr; CeO2
类别
资金
- National Natural Science Foundation of China [51974339, 51674270]
- Research Institute of Petroleum Exploration Development of China National Petroleum Cooperation [HX20201095]
- CUPB Teaching & Education Projects [XM10720180131, XM10720200034]
- [2017ZX05009-003]
Synthesized by in situ deposition-precipitation method, flower-like AgBr/CeO2 Z-scheme photocatalysts showed optimal photocatalytic activity in 40 wt% AgBr/CeO2 composite, suitable for dye degradation and bacterial disinfection.
The construction of Z-scheme heterojunctions is an effective method to enhance the photocatalytic activity of compounds. In this study, flower-like AgBr/CeO2 Z-scheme photocatalysts were synthesized by an in situ deposition-precipitation method. The AgBr mass fraction in the composites affected the photocatalytic performance. Notably, 40 wt%-AgBr/CeO2 exhibited optimal photocatalytic activity for the degradation of rhodamine B (RhB), methyl orange (MO), and tetracycline (TC) with final removal rates of 96%, 93.4%, and 77.8%, respectively. Following visible light irradiation for 180 min, 99.7% E. coli disinfection was achieved in the presence of this photocatalyst. After four cycles, 40 wt%-AgBr/CeO2 retained 65.0% photocatalytic activity for degrading RhB. Various analyses revealed that the dispersion of AgBr in the composites enhanced their optical properties. The 3D flower-like CeO2 provided a large contact interface and accelerated the transfer of photogenerated carriers. A Zscheme heterojunction between AgBr and CeO2 afforded higher redox capacity and provided abundant Ce3+/ Ce4+ couples with rich oxygen vacancies, facilitating the separation of photogenerated e--h+ pairs and affording various active species (center dot O2-, center dot OH, and h+); therefore, 40 wt%-AgBr/CeO2 displayed excellent visible-light photocatalytic and antibacterial activities, and it could be utilized in complex wastewater treatment.
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