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Visible-Light-Driven Photocatalytic Activity of Magnetic BiOBr/SrFe12O19 Nanosheets

1
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
2
Chongqing Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology (EBEAM), Yangtze Normal University, Chongqing 408100, China
3
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
4
College of Materials and Chemical Engineering, Chongqing University of Arts and Sciences, Yongchuan 402160, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(5), 735; https://doi.org/10.3390/nano9050735
Received: 27 April 2019 / Revised: 5 May 2019 / Accepted: 6 May 2019 / Published: 13 May 2019
(This article belongs to the Special Issue Photocatalytic Nanomaterials)
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Abstract

Magnetic BiOBr/SrFe12O19 nanosheets were successfully synthesized using the hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and UV-visible diffused reflectance spectra (UV-DRS), and the magnetic properties were tested using a vibration sample magnetometer (VSM). The as-produced composite with an irregular flaky-shaped aggregate possesses a good anti-demagnetization ability (Hc = 861.04 G) and a high photocatalytic efficiency. Under visible light (λ > 420 nm) and UV light-emitting diode (LED) irradiation, the photodegradation rates of Rhodamine B (RhB) using BiOBr/SrFe12O19 (5 wt %) (BOB/SFO-5) after 30 min of reaction were 97% and 98%, respectively, which were higher than that using BiOBr (87%). The degradation rate of RhB using the recovered BiOBr/5 wt % SrFe12O19 (marked as BOB/SFO-5) was still more than 85% in the fifth cycle, indicating the high stability of the composite catalyst. Meanwhile, after five cycles, the magnetic properties were still as stable as before. The radical-capture experiments proved that superoxide radicals and holes were main active species in the photocatalytic degradation of RhB. View Full-Text
Keywords: BiOBr/SrFe12O19; photocatalyst; Rhodamine B; photodegradation rate; magnetic photocatalyst BiOBr/SrFe12O19; photocatalyst; Rhodamine B; photodegradation rate; magnetic photocatalyst
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Xie, T.; Hu, J.; Yang, J.; Liu, C.; Xu, L.; Wang, J.; Peng, Y.; Liu, S.; Yin, X.; Lu, Y. Visible-Light-Driven Photocatalytic Activity of Magnetic BiOBr/SrFe12O19 Nanosheets. Nanomaterials 2019, 9, 735.

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