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Controlled synthesis of bifunctional 3D BiOBr:Eu3+ hierarchitectures with tunable thickness for enhanced visible light photocatalytic activities and mechanism insight

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Abstract

In this work, bifunctional 3D BiOBr:Eu3+ hierarchical nanostructures (HNs) assembled from 2D nanosheets with adjustable thickness were successfully fabricated via a solvothermal method by altering the amount of sodium citrate. The addition of sodium citrate effectively reduced the thickness of self-assembled nanosheets from 56 nm to 25 nm. The effects of thickness on the photoluminescence (PL) and photocatalytic activities of BiOBr:Eu3+ HNs had been systematically investigated. The results showed that the red emission of Eu3+ and the photocatalytic efficiency in degradation of MB were both improved significantly as the thickness of the nanosheets decreased. Upon excitation with blue light (465 nm), the BiOBr:Eu3+ HNs exhibited intense red emission corresponding to the 5D07F2 transitions of Eu3+ ions. Structural insights into the PL of Eu3+ ions revealed that the internal electric field (IEF) in BiOBr HNs increased significantly with decreasing sheet thickness, which improved the excitation field of Eu3+ ions and favored photogenerated charge separation and transfer. This work not only provided a new thought for understanding the photoreactivity through dopant PL, but also provided a platform for fabricating multifunctional materials for environmental and energy conversion applications.

Graphical abstract: Controlled synthesis of bifunctional 3D BiOBr:Eu3+ hierarchitectures with tunable thickness for enhanced visible light photocatalytic activities and mechanism insight

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Publication details

The article was received on 16 May 2019, accepted on 08 Aug 2019 and first published on 08 Aug 2019


Article type: Paper
DOI: 10.1039/C9CY00946A
Catal. Sci. Technol., 2019, Advance Article

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    Controlled synthesis of bifunctional 3D BiOBr:Eu3+ hierarchitectures with tunable thickness for enhanced visible light photocatalytic activities and mechanism insight

    Y. Li, L. Yao, Z. Cheng, S. Yang and Y. Zhang, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C9CY00946A

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