فهرست نشریات علمی دسترسی آزاد ایران

The current study involves synthesis of nickel oxide and cobalt oxide (NiO/CoO) nanocomposites at three different ratios (1:1, 1:2, and 2:1). These materials were synthesized using a co-precipitation method. The synthesized above materials were characterized by using different analytical and spectroscopic methods such as X- rays diffraction technique (XRD), scanning electron microscopy (SEM-EDX), specific surface area (BET), and Fourier transform infrared spectroscopy (FTIR). The activity of these materials was investigated by removing of Malachite Green (MG) dye from its aqueous solution by photocatalytic removal over these materials. Different photocatalytic removal conditions and parameters were conducted such as mass dosage of the used catalyst, concentration of the used dye, acidity of the solution and effect of reaction temperature. From the obtained results, the best ratio of NiO/CoO composites was (1:2) which exhibited best removal efficiency of the used dye over this composite and it was around 97%, this was obtained over using 0.2 g. of catalyst, 25 ppm of Malachite Green dye, acidity of solution (pH=6) and reaction temperature was 25 ℃. Also, the activation energy was calculated applying Arrhenius equation for this adsorption and it was around 17 KJ/mol. The dye degradation was also studied using the recovered catalysts.