A Novel Process for the Preparation of Ni0.5Zn0.5Fe2O4 Nanoparticles and Their Removal Behaviors of RR-2BF.

A novel solution combustion and calcination process has been reported for the preparation of magnetic Ni0.5Zn0.5Fe2O4 nanoparticles. The morphology, chemical composition, microstructure and magnetic properties of as-prepared Ni0.5Zn0.5Fe2O4 nanoparticles were investigated by XRD, TEM, SAED and VSM. The magnetic Ni0.5Zn0.5Fe2O4 nanoparticles were characterized with average grain size of about 18 nm and specific magnetization of 90.4 Am2/kg. The nanoparticles were employed to remove reactive red 2BF (RR-2BF) from aqueous solutions; and the adsorption kinetics and the adsorption isotherms were investigated by UV spectroscopy at room temperature; the regression equation was found in good agreement with the pseudo-second-order kinetic model in a range of initial concentration of 50-200 mg/L. Compared with Freundlich and Temkin models, Langmuir model fits the adsorption isotherm of RR-2BF onto the magnetic Ni0.5Zn0.5Fe2O4 nanoparticles better, which suggested that the adsorption of RR-2BF onto the magnetic Ni0.5Zn0.5Fe2O4 nanoparticles was monolayer, and the adsorption energy was constant.