One-pot hydrothermal fabrication of 2D/2D BiOIO3/BiOBr Z-scheme heterostructure with enhanced photocatalytic activity

Mingli Lu; Xinyan Xiao; Yu Xiao; Jingjing Li; Feihu Zhang

doi:10.1016/j.jcis.2022.06.081

One-pot hydrothermal fabrication of 2D/2D BiOIO₃/BiOBr Z-scheme heterostructure with enhanced photocatalytic activity

J Colloid Interface Sci. 2022 Nov:625:664-679. doi: 10.1016/j.jcis.2022.06.081. Epub 2022 Jun 22.

Authors

Mingli Lu¹, Xinyan Xiao², Yu Xiao³, Jingjing Li¹, Feihu Zhang¹

Affiliations

¹ School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
² School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China. Electronic address: cexyxiao@scut.edu.cn.
³ Department of Mechanical Engineering, University of Manitoba, Winnipeg R3T 2N2, Canada.

PMID: 35764046
DOI: 10.1016/j.jcis.2022.06.081

Abstract

A 2D/2D BiOIO₃/BiOBr Z-scheme heterostructure was firstly synthesized by a simple one-pot hydrothermal process and it was used to effectively remove rhodamine B under irradiation of Xe and LED light. The BB-15 heterostructure has an optimal apparent rate constant k of 0.046 min^-1 (0.17 min^-1), which is ∼6.2 (89.7) and 3.5 (3.5) times that of BiOIO₃ and BiOBr under the irradiation of Xe light (LED light). The enhanced photocatalytic activity can be attributed to the following points: (1) the face-to-face and tight contact in 2D/2D BiOIO₃/BiOBr heterostructures provides more migration channels for photogenerated carriers which facilitates the transfer and separation of photogenerated carriers; (2) the Z-scheme photocarrier transport path not only hastens the separation and transfer efficiency of photocarriers in space but also maintains a robust redox capacity; (3) the presence of IO₃^-/I^- redox couple and built-in electric field further encourage the separation and transfer of photocarriers and enhance the photocatalytic activity of the composite. And the O₂^-, h⁺, and OH are active species, which are responsible for the photodegrade process of RhB under irradiation of Xe light. This study provided an easy and reliable strategy to design and prepare an efficient bismuth-containing heterojunction, the characterization and evaluation experiment results proved its effectiveness for solar utilization and environmental purification.

Keywords: 2D/2D BiOIO(3)/BiOBr; Built-in electric field; IO(3)(−)/I(−) redox couple; Z-scheme heterostructure.