| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Highly Efficient Photocatalytic Degradation of RhB and Inactivation of E. coli with CQDs/Bi2WO6 Composite and Its Enhanced Visible Light Photocatalytic Activity |
| ZHAO Yanyan1,*, FAN Jingyu1, WEI Jing1, SHI Huanxian2
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1 College of Biology Pharmacy and Food Engineering, Shangluo University, Shangluo 726000, Shaanxi, China
2 School of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang 712046, Shaanxi, China |
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Abstract In this work, a CQDs/Bi2WO6 composite with good stability and outstanding photocatalytic activity was successfully prepared by doping CQDs. Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), Scanning electron microscopy(SEM), transmission electron microscopy(TEM)and UV-visible diffuse reflection(UV-vis)were employed to characterize the prepared photocatalysts. The photocatalytic activity of CQDs/Bi2WO6 composite was evaluated by photodegradation of RhB, and the visible light driven photocatalytic inactivation of E. coli and the possible bactericidal mechanisms were also studied. The results indicated that the CQDs doping can effectively improve the photocatalytic activity of Bi2WO6. About 99.98% of RhB could be degraded with CQDs/Bi2WO6 composite under visible light irradiation for 40 min, and approximately 44.82% of E. coli can be inactivated under visible light irradiation for 6 h. Mechanism studies showed that h+ was the major active species, while e- was the minor active species. A large number of ·O2- and ·OH were produced during the photocatalytic process, which participated in the oxidation-reduction reaction to degrade organic dyes and inactivate E. coli. This work provi-ded an important reference to wastewater photocatalytic treatment towards pathogenic bacteria and organic pollutant.
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Published: 10 March 2023
Online: 2023-03-14
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| Fund:Natural Science Foundation of Shaanxi Province (2021JQ-838), Specialized Research Fund of Education Department of Shaanxi Province (20JY009), and Specialized Scientific Research Fund Projects of Academician Shengyong Zhang (20YSZX01). |
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2023, Vol. 37 
