Preparation and Photocatalytic Performance of Bi2WO6/ZIF-67 Composite Photocatalyst
CHANG Na1, CHEN Yanru2, XIE Feng1, WANG Haitao2
1 School of Chemical Engineering and Technology, Tiangong University, Tianjin 300387, China 2 School of Environmental Science and Technology, Tiangong University, Tianjin 300387, China
Abstract: Flower-like Bi2WO6 microspheres were prepared via the hydrothermal method, and ZIF-67 nanoparticles were loaded on the surface of Bi2WO6 microspheres to prepare Bi2WO6/ZIF-67 composite photocatalyst. XRD, XPS, FTIR and SEM were used to characterize the structure, surface groups and morphology of the composite photocatalyst. The photochemical and electrochemical properties of the composite photocatalyst were investigated by measuring UV-Vis spectra, photoluminescence spectra, electrochemical impedance spectra and transient photocurrent. Degradation of tetracycline hydrochloride by the composite photocatalyst was tested under visible light irradiation. Results revealed that ZIF-67 nanoparticles were loaded uniformly on the surface and cracks of Bi2WO6. The combination of Bi2WO6 and ZIF-67 effectively increased the separation efficiency of photo-induced electron-hole pairs and further improved the photocatalytic performance of the composite photocatalyst. Under visible light irradiation, the photocatalytic reaction rate of Bi2WO6/ZIF-67 was 4.53 times and 5.87 times as high as that of Bi2WO6 and ZIF-67, respectively. Free radical capture experiments indicated that holes (h+), superoxide radical (·O2-) and hydroxyl radicals (·OH) were the main active species in the photocatalytic degradation process. Photocatalytic mechanism was also proposed, and the photocatalytic reaction of Bi2WO6/ZIF-67 catalyst was attributed to the Z-scheme photocatalytic mechanism.
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