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Photocatalytic Properties of TiO2 induced by ZnFe2O4 Nanoparticles under Visible Light Irradiation

Abstract Visible-light-active photocatalysts TiO2 induced by ZnFe2O4 nanoparticles (ZnFe2O4/TiO2) were prepared by a simple preparation method. The diffuse reflection spectra (DRS) results showed that the absorption edge of ZnFe2O4/TiO2 photocatalyst moved to the visible spectrum range and a large redshift occurred in comparison with the undoped TiO2. X-ray diffraction (XRD) results showed that the dispersed ZnFe2O4 nanoparticles prevented the formation of the rutile phase to some extent. Field emission scanning electron micrography (SEM) and transmission electron microscopy (TEM) were used to characterize the morphology of the photocatalyst, indicating that the ZnFe2O4 nanoparticles were dispersed among TiO2 nanoparticles. The analysis of X-ray photoelectron spectra (XPS) indicated that all the characteristic peaks of TiO2 and ZnFe2O4 were observed in the ZnFe2O4/TiO2 composite photocatalysts and the hydroxyl content on the surface of ZnFe2O4/TiO2 nanoparticles was more than that on the surface of TiO2. The photocatalytic experimental results exhibited that ZnFe2O4/TiO2 could effectively photodegrade methyl orange under visible light irradiation, and the ZnFe2O4 had a visible light-induced role.