Photocatalytic effect of CuO nanoparticles flower-like 3D nanostructures under visible light irradiation with the degradation of methylene blue (MB) dye for environmental application

The present research work focuses on preparing 3D transition metal doped copper oxide nanostructures through sonication method and to investigate the effect of doping different transition metal into copper oxide (CuO) on the basic properties of CuO nanoparticles and, to study the photocatalytic behaviour of the doped CuO samples. The morphological studies performed with the help of SEM revealed the formation of flower like CuO 3D nanostructures for all the doped samples. The slight shift in the position of peaks in the x-ray diffraction (XRD) pattern confirms that doping has been successfully done into CuO. Also, the sharp diffraction peaks suggest the polycrystalline nature of the sample with monoclinic structure. The UV-vis absorption analysis reveals a bandgap of 2.26, 2.12 and 2.15 eV for the CuO samples doped with nickel, zinc, and iron respectively via Tauc plot. The photocatalytic performance of the samples tested through the degradation of methylene blue (MB) dye suggests that samples doped with Zn shows better degradation. Thus, it is evident that the morphology and the optical properties of the CuO can be tailored by doping transition metal into it.

Automated summary

The research focused on preparing 3D transition metal doped copper oxide nanostructures via sonication method and studying the effect of different transition metal dopants on the properties of CuO nanoparticles. The morphological studies confirmed the formation of flower-like CuO 3D nanostructures for all doped samples, with successful doping indicated by slight shifts in XRD peaks. UV-vis absorption analysis showed varying bandgaps for CuO samples doped with nickel, zinc, and iron, while photocatalytic testing revealed enhanced degradation efficiency in Zn-doped samples. This suggests that morphology and optical properties of CuO can be modified by doping transition metals.