This study describes the preparation of coupled oxide Ni3O4-MgO using co-precipitation method using their corresponding nitrates as precursor materials to prepare these coupled oxides. The prepared oxides were investigated with X-ray diffraction and Fourier transform infrared spectroscopy. The photocatalytic activity of this material was investigated by following removal of Celestine blue B dye from simulated industrial wastewaters. 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 Celestine blue B dye over the period of reaction mixture was calculated spectroscopically by measuring the absorbance of supernatant liquid at 648 nm. From the results, it was found that the optimum conditions for dye removal in this study was 0.20 g, pH 4 and a contact time of 30 min and the dye removal percentage under these conditions was found to be 89 %.

The current work involves preparation of neat vanadium oxide and cobalt oxide. Likewise, various percentage from their mixed forms were prepared in various ratios: 25%, 50%, 75% and 100% from CoO were precipitated with fixed weight of V2O5 2.0 g. In addition, the above percentage from V2O5 were precipitated with fixed weight of CoO, 2.0 g. The individual metal oxides and their mixtures with various ratios were prepared from the solution of sulphate and nitrate of both metals respectively by co-precipitation process by adding sodium carbonate. All metals carbonates transfer to corresponding oxides by calcification at 773 K. Spectroscopic studies for metal oxides and their mixtures with various ratios using X-rays diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Some of physical properties of these oxides and their mixtures were studies such as pore size, density, porosity and electrical conductivity. The activity of these materials were investigated by following photocatalytic oxidation of 1-octanol over a suspension of these materials. The obtained results showed that photocaatalytic oxidation of alcohol was achieved when using each of catalyst, light, air and 1-octanol.