Facile fabrication of hierarchical BiVO4/TiO2 heterostructures for enhanced photocatalytic activities under visible-light irradiation
- 389 Downloads
BiVO4/TiO2 nanocomposites were fabricated by a facile wet-chemical process, followed by the synthesis of TiO2 hierarchical spheres via hydrothermal method. The BiVO4/TiO2 nanocomposites were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The results showed that prepared TiO2 presented hierarchical spherical morphology self-assembled by nanoparticles and an anatase–brookite mixed crystal phase. The introduction of monoclinic BiVO4 components retained the hierarchical structures and expanded the light response to around 510 nm. Type II BiVO4/TiO2 heterostructured nanocomposites exhibited improved photocatalytic degradation towards methylene blue under visible-light irradiation, especially for the composite photocatalysts with atomic Ti/Bi = 10, which showed double degradation rate than that of pure BiVO4. The enhanced photocatalytic mechanism of the heterostructured BiVO4/TiO2 nanocomposites was discussed as well.
This work was financially supported by the National Natural Science Foundation of China (NSFC, Grant No. 51272115 and NSFC, Grant No. 61504073) and Doctoral Found of QUST (No. 010022803).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest regarding the publication of this article.
- 7.Chen F, Yang Q, Wang Y, Zhao J, Wang D, Li X, Guo Z, Wang H, Deng Y, Niu C, Zeng G (2017) Novel ternary heterojunction photocatalyst of Ag nanoparticles and g-C3N4 nanosheets co-modified BiVO4 for wider spectrum visible-light photocatalytic degradation of refractory pollutant. Appl Catal B 205:133–147CrossRefGoogle Scholar
- 22.Cullity BD, Stock SR (2001) Elements of X-ray diffraction, 3rd edn. Prentice Hall, PrenticeGoogle Scholar
- 24.Pauling L, Sturdivant JH (1928) The crystal structure of brookite. Z Kristall 68:239–256Google Scholar
- 42.Ye LQ, Liu JY, Jiang Z, Peng TY, Zan L (2013) Facets coupling of BiOBr-g-C3N4 composite photocatalyst for enhanced visible-light-driven photocatalytic activity. Appl Catal B Environ 142–143:1–7Google Scholar