Journal
NANOMATERIALS
Volume 9, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/nano9050735
Keywords
BiOBr; SrFe12O19; photocatalyst; Rhodamine B; photodegradation rate; magnetic photocatalyst
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Funding
- State Key Laboratory of Coal Mine Disaster Dynamics and Control in Chongqing University [2011DA105287-MS201802]
- Scientific and Technological Research Program of the Chongqing Municipal Education Commission [KJ1711286/KJ1711266]
- Chongqing Basic Science and Advanced Technology Research Program [CSTC2018jcyjAX0426]
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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 (lambda > 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.
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