Adsorption of Azo Dye Direct Blue 71 from Aqueous Solution Using NiFe2O4/CP Nanoparticles: Kinetic and Isotherm Model

Abstract

Removal of azo dye Direct Blue 71 (DB71), from aqueous solution using synthesized nickel ferrite nanoparticles (NFN) (NiFe₂O₄) supported on Clinoptilolite zeolite (CP) was studied. The prepared NFN-CP were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray (EDX), and Brunauer–Emmett–Teller (BET) surface area analysis. The kinetic and isotherm of dye adsorption was studied. The effects of operational parameter such as: pH, adsorbent dosage and contact time on the process were studied and optimized. The results showed that pH 6, adsorbent dosage 0.12 g, contact time 45 min was optimum conditions for adsorption process. The results showed that the dye adsorption onto CP and NFN-CP followed Langmuir isotherm. Adsorption kinetics of DB71 onto the NFN-CP followed the pseudo-second-order kinetic model.