Highly Efficient Photocatalytic Degradation of RhB and Inactivation of E. coli with CQDs / Bi2WO6 Composite and Its Enhanced Visible Light Photocatalytic Activity

n this work,a CQDs / Bi2 WO6 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 / Bi2 WO6 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 Bi2 WO6 . About 99. 98% of RhB could be degraded with CQDs / Bi2 WO6 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 provided an important reference to wastewater photocatalytic treatment towards pathogenic bacteria and organic pollutant. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.