Hydrothermal synthesis and photocatalytic performance of Bi2WO6/ZnO heterojunction photocatalysts
MetadataShow full item record
A series of Bi2WO6/ZnO heterojunction photocatalysts with different Bi2WO6 concentrations (1wt%, 2wt%, 4wt%, 8wt%) were prepared by hydrothermal method at different temperatures(120°C -220°C ). The prepared pure ZnO, Bi2WO6 and Bi2WO6/ZnO heterojunction photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscope (FT-IR), UV-Vis diffuse reflectance spectra, and photoluminescence (PL) spectroscope, respectively. The photocatalytic activity of the prepared catalysts was evaluated by photocatalytic degradation of acid orange II under UV light (?=365nm) irradiation. Results show that the photocatalytic activity of Bi2WO6/ZnO heterojunction photocatalysts is superior to that of pure ZnO and Bi2WO6. The optimal concentration of Bi2WO6 is 4wt% and the best hydrothermal temperature is 150°C . Under the above conditions, the prepared composite catalyst shows about 2.4 times in activity of the pure ZnO. The formation of Bi2WO6/ZnO heterojunction could effectively suppress the recombination of the photo generated electron and hole pairs and result in an increase in photocatalytic activity. Moreover, more surface OH groups over the Bi2WO6/ZnO heterojunction photocatalysts will further benefit the improvement of photocatalytic activity.
Showing items related by title, author, creator and subject.
Yu, C.; Yang, K.; Shu, Q.; Yu, J.; Cao, F.; Li, Xin Yong; Zhou, X. (2012)A series of Mo-doped ZnO photocatalysts with different Mo-dopant concentrations have been prepared by a grinding- calcination method. The structure of these photocatalysts was characterized by a variety of methods, including ...
Surface acid etching of (BiO)2CO3 to construct (BiO)2CO3/BiOX (X = Cl, Br, I) heterostructure for methyl orange removal under visible lightCao, J.; Li, Xin Yong; Lin, H.; Xu, B.; Chen, S.; Guan, Q. (2013)A series of (BiO)2CO3/BiOX (X = Cl, Br, I) heterostructured photocatalysts were synthesized through acid etching method and characterized by XRD, DRS, SEM and HRTEM, respectively. Under visible light (λ > 400 nm), ...
Synthesis of Fe2O3–TiO2/fly-ash-cenosphere composite and its mechanism of photocatalytic oxidation under visible lightZhu, J.; Liu, Shaomin; Ge, J.; Guo, X.; Wang, X.; Wu, H. (2016)© Springer Science+Business Media Dordrecht 2015. Fe2O3-TiO2/fly-ash-cenosphere (FAC) is a composite photocatalyst that was prepared by depositing Fe2O3 onto floating TiO2/FAC. Scanning electron microscopy, X-ray diffraction ...