Solid-state fabrication of BiOBr/Bi24O31Br10 lattice heterojunction for photocatalytic reduction of CO2 and degradation of RhB

The contact degree of heterojunction plays a crucial role to the separating efficiency of photo-generated carriers. Herein, a nano-sheet like BiOBr/Bi 24 O 31 Br 10 lattice heterojunction is firstly prepared from a simple solid-state chemical reaction. The phase transformation from BiOBr to BiOBr/Bi...

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Veröffentlicht in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2022-02, Vol.24 (2), Article 27
Hauptverfasser: Feng, Yue, Xie, Jing, Lu, Zhenjiang, Hao, Aize, Hu, Jindou, Cao, Yali
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Sprache:eng
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Zusammenfassung:The contact degree of heterojunction plays a crucial role to the separating efficiency of photo-generated carriers. Herein, a nano-sheet like BiOBr/Bi 24 O 31 Br 10 lattice heterojunction is firstly prepared from a simple solid-state chemical reaction. The phase transformation from BiOBr to BiOBr/Bi 24 O 31 Br 10 , then to pure Bi 24 O 31 Br 10 can be realized simply by the thermal annealing process. Benefiting from the enhanced photoinduced carrier separation efficiency of the formed lattice heterojunction, the BiOBr/Bi 24 O 31 Br 10 composite exhibites excellent photocatalytic capability to reduce CO 2 to CO, which has a stable yield of CO (29.19 μmol g −1 ) after 5 h of continuous catalytic reaction, the reaction rate constants are 4.2 and 3.5 times higher than that of pure Bi 24 O 31 Br 10 and BiOBr, respectively. Meanwhile, the heterostructures present super photocatalytic degradation ability for rhodamine B (RhB) under visible light. The mechanism of the photocatalytic reduction and oxidation process is systematically investigated and proposed. This work provides an effective strategy to design staggered heterojunction photocatalyst by a solvent-free method and reveals the mechanism of lattice heterostructure for boosting photocatalytic performance. Graphical abstract
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-021-05394-z