Fabrication of CsPbBr3 nanocrystals/Bi2MoO6 nanosheets composites with S-scheme heterojunction for enhanced photodegradation of organic pollutants under visible light irradiation. Issue 4 (August 2022)

• Record Type: Journal Article
• Authors: Zhao, Zhihao; Chen, Changchun; Wang, Jian; Cheng, Cheng; Tang, Zhonghai; Zhu, Xinhui; Wang, Yifeng; Pan, Lin; Ni, Yaru
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 4(2022)
• Publication Date: 2022-08
• Subjects: Bi2MoO6 -- CsPbBr3 -- S-scheme heterojunction -- Photocatalysis -- RhB; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108152
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Semiconductor photocatalysts can eliminate environmental pollution, especially water pollution. In this study, novel CsPbBr3 nanocrystals/Bi2 MoO6 nanosheet composites were successfully fabricated via hydrothermal method together with electrostatic self-assemble process. The formation of S-scheme heterojunction, migration of photogenerated carriers and photocatalytic reaction mechanism were elaborated by means of density functional theory (DFT) calculation, In-situ irradiated X-ray photoelectron spectroscopy (XPS) and other characterization techniques. This scheme not only solved the problem of poor photogenerated carrier migration and separation efficiency of Bi2 MoO6 based photocatalyst, but also broadened the photo-response range. For the emerging photocatalyst CsPbBr3, the surface morphology of the synthesized composite was also conducive to improve its' chemical stability. Compared to other specimens, the CsPbBr3 /Bi2 MoO6 5 wt% (BC5%) composite sample showed the optimal photocatalytic activity and the Rhodamine B (RhB) degradation over it attained 95.8% under visible light irradiation for 90 mins. Additionally, the degradation performances of RhB in different solution environments such as catalyst dosage, pollution concentration, pH, and reaction temperature were thoroughly investigated. Especially, the photocatalytic activity of BC5% composite sample was also evaluated via biotoxicity experiments. This work would provide a successful experience for devising and realizing highly efficient photocatalysts in the future. Graphical Abstract: ga1 Highlights: S-scheme CsPbBr3 nanocrystals/Bi2 MoO6 nanosheets heterojunction was fabricated. The photocatalytic stability of all-inorganic CsPbBr3 perovskite in the composite was evaluated. Density functional theory calculation was used to analyze the structure of energy band. The photocatalytic degradation mechanism of the system was explained in detail. The biotoxicity experiments were performed to judge the photocatalytic activity.