Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 161, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2021.110381
Keywords
Bi2O4; BiOBr; p-n junction; Hierarchical structure; Photocatalysis
Funding
- National Natural Science Foundation of China [21663012]
- Natural Science Foundation of Jiangxi Province [20181BAB203009]
- Scientific and Technological Project of Education Department of Jiangxi Province [GJJ201129, GJJ201132]
- Doctoral Start-up Fund, P.R. China [2019BSQD002]
- Project of Jiangxi Science and Technology Normal University, P.R. China [2020XJYB016]
Ask authors/readers for more resources
The BiOBr/Bi2O4 p-n heterojunction, fabricated by a co-precipitation method, exhibits superior visible light catalytic activity due to its three-dimensional hierarchical structure and enhanced utilization of incident photons. The p-n junction accelerates interfacial electron hole pairs transfer and separation, extending the lifetime of charge carriers. Trapping experiments reveal that hole (h+) and superoxide radical (center dot O-2(-)) are the major active species in the catalytic photodegradation process.
Construction of heterojunction and design of its architecture are effective strategies to improve the catalytic performance of photocatalyst. Herein, BiOBr/Bi2O4 p-n heterojunction was fabricated by a co-precipitation method, in which two-dimensional (2D) BiOBr nanosheets sheathed well on the surface of quasi-onedimensional (1D) Bi2O4 submicrorods, forming a three-dimensional (3D) hierarchical structure. Such structural feature can not only enhance the utilization of incident photons through multi-reflection within the hierarchical structure but also raise the specific surface areas to supply more surface-active sites to participate in photocatalytic reaction. More importantly, BiOBr/Bi2O4 p-n junction could accelerate the interfacial electron hole pairs transfer and separation via the built-in electric field, extending the lifetime of charge carriers. Thus, as-prepared BiOBr/Bi2O4 heterojunctions exhibit superior visible light catalytic activity for the photo degradation of 4-chlorophenol (4-CP). The catalytic activity of optimal junction is 2.03-fold as high as that of pristine Bi2O4. The trapping experiments demonstrate that hole (h+) and superoxide radical (center dot O-2(-)) are the major active species during the catalytic photodegradation process of 4-CP. This work presents a unique tactic for the construction of high-performance Bi2O4-based heterojunction for the removal of organic pollutants.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available