Optimization of congo red removal by adsorption onto NiFe2O4/GO nanocomposite

Abstract

The present study focused on the use of the magnetic nanocomposite NiFe₂O₄/GO (GO - Graphene oxide) as an efficient adsorbent for the removal of congo red (CR). The NiFe₂O₄/GO was synthesized from NiFe₂O₄ and GO via a facile route, and the structure of this nanocomposite was analyzed by X-ray powder diffraction (XRD), scanning electron microscope (SEM), and Vibrating sample magnetometer (VSM). By applying the response surface methodology, the profound relationship was found between variables (initial concentration, adsorbent dosage, and pH) and CR removal efficiency. Moreover, the model was optimized to give a favourable condition for the adsorption. Up to 94.7% of CR removal was obtained via a confirmation test, and this result indicated that the magnetic NiFe₂O₄/GO was a promising material in terms of treatment for CR-contaminated wastewater.