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In this study, photo-catalytic degradation of methyl orange (MO) azo dye was examined by undoped and Ce 2 O 3 / CuO/ N doped ZnO nanoparticles stabilized on γAl 2 O 3 . Highest photo-catalytic activity was observed for the N-doped 10 wt. % ZnO-γAl 2 O 3  sample. One of the optimal points with the complete MO decomposition was determined at an initial concentration of 8.25 ppm, pH 3.25, catalyst loading of 0.36 g/L and 12.56 W UV-light irradiation after 120 min. Physical and chemical properties of materials were investigated by X-ray diffraction analysis (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) and UV–visible diffuse reflectance spectroscopy (DRS) method. The experimental data were best fitted by a Langmuir-Hinshelwood approach photo-catalysis developed kinetic reaction rate in the form of−  r  =  0.2797I   0.5[  C  a  t  .    ]   0.5[  D  y  e  ]        /1  +  0.1079[  D  y  e    ]  0+    0.4086I   0.5[  C  a  t  .    ]   0.5$- r = 0.2797\, {I^{0.5}}\, {[Cat.]^{0.5}}\, \, [Dye]{\text{ }}/\, \, \, 1 + 0.1079\, {[Dye]_0}\,  + \, 0.4086\, {I^{0.5}}\, {[Cat.]^{0.5}}$.

Synthesis and Characterization of N- Doped ZnO-γAl 2 O 3 Nanoparticles for Photo-catalytic Application