Fabrication of oxygen vacancy-rich 3D/2D BiO1-XBr/BiOCl heterostructures towards efficient charge separation for enhanced photodegradation activity. (November 2021)

• Record Type: Journal Article
• Authors: Zhao, Wenli; Wang, Xu; Wang, Wenliang; Han, Tongyu; Wang, Hongtao; Shi, Haifeng
• Is Part Of: Materials research bulletin. Volume 143(2021)
• Publication Date: 2021-11
• Subjects: BiO1-XBr -- BiOCl -- Oxygen vacancy -- 3D/2D; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2021.111448
• Languages: English
• ISSNs: 0025-5408

Abstract

Highlights: Oxygen vacancy-rich 3D/2D BiO1-XBr/BiOCl was successfully prepared. The separation rate of photo-induced charge over BiO1-XBr/BiOCl was notably improved. 3D/2D BiO1-XBr/BiOCl showed a high TC photodegradation activity. The photocatalytic reaction mechanism over BiO1-XBr/BiOCl was proposed. Abstract: In this work, oxygen vacancy (OV)-rich 3D/2D BiO1-X Br/BiOCl heterostructures were prepared successfully via a simple hydrothermal treatment method. The photocatalytic degradation activities for a series of BiO1-X Br/BiOCl composites were evaluated through visible-light-driven tetracycline (TC) degradation. The result demonstrated that suitable ratio of BiO1-X Br/BiOCl (BB-60) showed significantly improved photodegradation activity. The improved photocatalytic performance was mainly attributed to the synergistic effect of 3D/2D heterojunction and OVs. The relatively small 2D BiOCl nanosheets deposit on 3D BiO1-X Br to form 3D/2D heterostructure with more contact areas and active sites, which improve the separation of photogenerated charges. In addition, rich OVs can not only promote the separation of electron-hole pair but also improve the capability of visible light absorption for photocatalysts. The possible photocatalytic reaction mechanism of BB-60 was also revealed by active species trapping experiments. Finally, this study brought a new opportunity to rationally design OV-rich 3D/2D heterojunction for the enhanced photocatalytic ability. Graphical abstract: Image, graphical abstract