A direct Z-scheme photocatalyst CuFe 2 O 4 @CeO 2 core-shell was applied in the photocatalytic degradation of the methyl violet dye 2B (MV). In first, CuFe 2 O 4 and CeO 2 were synthesized via sol-gel method, and then CuFe 2 O 4 @CeO 2 nanocomposite was prepared using microwave process. The nanoparticles were characterized by thermogravimetric analysis (TG and derivative thermogravimetry [DTG]), atomic absorption spectroscopy (AAS), Brunauer-Emmett-Teller (BET) analysis, Xray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), energy dispersive-X-ray (EDX) and ultraviolet (UV)visible diffuse reflectance/absorption spectroscopy. The photocatalytic activity of CuFe 2 O 4 @CeO 2 nanocomposite was evaluated by the photo-degradation of the MV under UV and visible-light irradiation. MV does not rapidly degrade itself in UV or visible-light but the process is accelerated upon the addition of semiconductors with a wide band-gap. The CuFe 2 O 4 @CeO 2 nanocomposite shows an important MV decomposition rate under visible-light irradiation (95.35% within 1.5 h) as compared to UV-light (86.10% within 2.5 h). The excellent activity of CuFe 2 O 4 @CeO 2 under UV and visible-light was mainly attributed to direct Z-scheme which are originated from a core-shell structure which prompted the generation of ˙OH radical species responsible for the photo-degradation of the substance. However, this could also be due to the large specific surface area and/or efficient UV-vis harvesting.
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