Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 6, Pages 8300-8307Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.11.191
Keywords
Bismuth oxyhalides; Magnetic photocatalyst; Enhancement mechanism; Microemulsion method
Categories
Funding
- State Key Laboratory of Coal Mine Disaster Dynamics and Control [2011DA105287-zd201904]
- Department of Science and Technology of Sichuan Province [19YYJC2854]
- Sichuan Science and Technology Program [2019YJ0528]
- University-level Natural Science Research fund projects [XJKY1046]
- Sichuan Provincial Education Department [18ZA0407]
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A novel magnetic Bi4O5Br2/SrFe12O19 nanocomposite was synthesized via a microemulsion method to improve the catalytic activity and recovery efficiency of photocatalysts. The photocatalyst showed enhanced degradation of Rhodamine B due to optimized energy band structure and the formation of an internal electric field in the type-II heterojunction. The primary active constituents in the photocatalytic reaction were identified as h(+) and O-center dot(2) through energy-band structure analysis and radical scavenging experiments.
To improve the catalytic activity and recovery efficiency of photocatalysts, the Bi4O5Br2 was decorated on SrFe12O19 via a microemulsion method to synthesize a novel magnetic Bi4O5Br2/SrFe12O19 nanocomposite. The microstructures, morphological characteristics, photoelectrochemical properties, magnetic performance and photocatalytic mechanism of catalysts were investigated by various techniques. The photocatalytic experiments presented that the Bi4O5Br2/SrFe12O19 photocatalyst with 5 wt% of SrFe12O19 has the best capacity for degrading Rhodamine B (RhB). The activity of the photocatalyst was increased by the optimization of energy band structure and the formation of an internal electric field in the type-II heterojunction. Moreover, the h(+) and O-center dot(2) were demonstrated to be the primary active constituents in the photocatalytic reaction by the energy-band structure analysis and radical scavenging experiments. The saturated magnetizing strength (Ms) and the recovery rate of composite photocatalyst were 2.76 emu.g(-1) and 88.2% respectively, which confirmed that the nanocomposite has excellent magnetic property. Meanwhile, the photodegradation rate was still 84.6% after five circulating tests, which demonstrated that the sample has the superior photo-stability performance. This paper offers a new approach to the synthesis of the composite magnetic photocatalyst based on Bi4O5Br2, and some guidance for the photocatalytic degradation mechanism.
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