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The present study deals with the synthesis and characterizations of zinc oxide and manganese doped zinc oxide nanoparticles. The nanoparticles were synthesized by using simple hydrothermal technique and characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM). The XRD analysis of different samples revealed the presence of wurtzite phase of all the samples. The TEM analysis revealed the spherical or hexagonal shape of the crystalline particles with smooth surfaces. Further the effect of manganese doping on the photocatalytic performance was also investigated. For the photocatalytic experiments, the degradation of Direct Blue 15 dye in aqueous phases was examined under UVand solar irradiation.

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