In this research, the performance of the prepared composite adsorbent containing nickel ferrite, zinc oxide and alpha alumina nanoparticles on graphene oxide substrate for the removal of malachite green cationic dye was investigated. First, composites with different proportions of nickel ferrite and zinc oxide were prepared. The characteristics of the prepared composites were analyzed using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), vibrating sample magnetometry (VSM) and BET analysis. Then, the effect of operating conditions such as pH (in the range of 3 to 9), initial dye concentration (100 to 1500 mg/L), adsorbent mass, temperature (5 to 45°C) and contact time on dye adsorption efficiency was eva‎luated. The maximum experimental adsorption capacity was 607 mg/g. Also, the fitting of the experimental obtained data in the adsorption models and kinetic models showed a better agreement with the Freundlich adsorption isotherm and the pseudo-first-order kinetic model. Investigation of the possibility the recovery of the adsorbent showed a better performance of the adsorbent after washing with ethanol compared to acetone and water solvents.

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غلامحسين محمدنژاد شيرازي , كاظم كرمي