In this study, g-C3N4, g-C3N4/TiO2, g-C3N4/ZnO, g-C3N4/TiO2-ZnO nanostructures with different molar ratios of ZnO were synthesized. The synthesized samples were characterized using field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), brunauer-emmett-teller (BET) and UV–visible diffuse reflectance spectroscopy (UV-vis-DRS) techniques. The FE-SEM images showed the surface morphology of each samples. The results of UV-vis-DRS indicated that the band-gap of TiO2 was reduced by adding g-C3N4 and different molar ratios of ZnO. The results obtained from BET analysis confirmed that the surface area of g-C3N4/TiO2-ZnO (1:10) nanostructure was 97.494 cm2/g and comparatively higher than other nanostructures and became suitable for photocatalytic activity. The photocatalytic activity of the g-C3N4/TiO2-ZnO nanostructure was performed by the photo-degradation of methylene blue dye under simulated solar light. The results of photocatalytic activity showed that the synthesized nanostructure had good degradation ultraviolet and visible light irradiation by 94.6% and 62.4%, respectively. Also, the kinetics of photocatalytic degradation confirmed that degradation of MB dye in the presence of ultraviolet light was faster than visible light. Furthermore, the study on reusability of nanostructure exhibited good photo-stability and activity after six runs.
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