This study describes preparation of the coupled oxide Ni3O4-MgO using co-precipitation method
with using their corresponding nitrates as precursor materials to prepare these coupled oxides. The
prepared oxides were investigated with X-Rays Diffraction (XRD), Fourier transform infrared
spectroscopy(FTIR), Atomic Force Microscopy(AFM). The photocatalytic activity of these materials
were investigated by following removal of Celestine Blue B aa(C s Cn lCy)leBBd C)f eyd )BBC(
C.wByd wBd y Different reaction conditions were undertaken to reach optimum conditions for dye
removal. These conditions involve performing different catalyst loading, effect of contact time, and
effect of pH of reaction mixture. The remaining concentration of CBB dye over the period of
reaction mixture was calculated spectroscopically by measuring the absorbance of supernatant liquid
at 648 nm. From the obtained results, it was found that the optimum conditions for dye removal in
this study was using 0.20 g., pH=4 and a contact time of 30 minute and the percentage of dye
removal under these conditions was around 89%.