فهرست نشریات علمی دسترسی آزاد ایران

The current study involves synthesis of iron oxide, nickel oxide and then synthesis of FeO-NiO composites in three different ratios (1:1, 1:2, and 2:1). These materials were synthesized using co-precipitation method. The synthesized above materials were characterized by using different analytical and spectroscopic methods such as X-ray diffraction technique (XRD), scanning electron microscopy (SEM-EDX), specific surface area (BET), and Fourier transform infrared spectroscopy (FTIR). The activity of these synthesized materials was investigated by removing of Malachite Green (MG) dye from its aqueous solution by adsorption over these materials. Different adsorption conditions and parameters were conducted such as mass of catalyst, concentration of the used dye, pH of the solution and the effect adsorption temperature. From the obtained results, the best ratio of FeO-NiO composites was (2:1) which exhibited best removal efficiency of the used dye over this composite and it was around 96%, and this was obtained over using 0.20 g. of catalyst, 20 ppm of Malachite Green dye, 6 pH and 25 ℃. Adsorption isotherm was investigated for adsorption of MG dye over FeO-NiO composites (2:1), and the obtained results showed that it was more fitted with Freundlich isotherm. Also, the activation energy was calculated applying Arrhenius equation for this adsorption and it was around 15 KJ/mol., which falls in the range of physical adsorption.