2O 4/TiO 2 hybrid materials with high photocatalytic activity]]>

摘要

Graphical abstractGraphical abstract shows the schematic photocatalytic mechanism of RhB (a target pollutant for the ZTC3.00 composites during the simulated sunlight irradiation photocatalytic process. The ZTC3.00 composites performs excellent photocatalytic activity, believing that a promising technology in reducing the water pollutants in the further.Display OmittedHighlights?The ZnFe2O4/TiO2/3.00wt%CDs photocatalyst was firstly successfully synthesis by facile hydrothermal method.?The hybrid materials exhibited the higher photocatalytic activity and stability.?OH and O2?were the main active species for the photocatalytic degradation of RhB.?The possible enhanced mechanism of the ZnFe2O4/TiO2/3.00wt%CDs under simulated sunlight irradiation was deduced.AbstractIn this study, a novel and highly efficient ternary photocatalytic ZnFe2O4/TiO2/CDs nanocomposite was successfully synthesized by a hydrothermal method. The properties and structures of the samples were characterized by X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Fourier transform infrared spectrometry (FT-IR), and photoluminescence spectrum (PL). The UV–vis diffuse reflectance spectrum was used to demonstrate that carbon quantum dots could increase the absorption of visible light wavelengths. When compared with TiO2/3.00wt%CDs and ZnFe2O4/TiO2nanocomposites, the ternary photocatalysts exhibited the enhanced photocatalytic activity under solar-spectrum irradiation. A low CDs content of 3.00wt% in the ternary photocatalysts possessed excellent performance in the decomposition of Rhodamine B (RhB). Act as donator and receiver, CDs can efficiently improve the ability of electron transfer and separate the electron-hole pairs. OH and O2?were confirmed to be involved in the photocatalytic degradation of RhB base on the Electron spin resonance (ESR) tests, and the photocatalytic mechanism of the ZnFe2O4/TiO2/3.00wt%CDs was proposed. After four sequential operational cycles, the ZnFe