Adsorption Performance of Reactive Red 2BF onto Magnetic NiFe₂O₄ Nanoparticles Prepared via the Coprecipitation Process.

Abstract

Magnetic NiFe₂O₄ nanoparticles were successfully prepared via the coprecipitation process with ferric nitrate, nickel nitrate, and sodium hydroxide as raw materials, and they were characterized by the scanning electron microscopy (SEM), the transmission electron microscope (TEM), the X-ray diffraction (XRD), the vibrating sample magnetometer (VSM), the energy dispersive spectroscopy (EDS) and the Brunauer-Emmett-Teller (BET). The magnetic NiFe₂O₄ nanoparticles were employed to research the adsorption performance of reactive red 2BF (RR-2BF) onto them, and they revealed very large adsorption capacity of RR-2BF. The adsorption kinetics data were evaluated with the pseudo first-order, the pseudo second-order and the intraparticle diffusion models, and the results showed that the pseudo second-order kinetics model was best fitted for the adsorption of RR-2BF onto magnetic NiFe₂O₄ nanoparticles. While, the adsorption isotherm experiments were carried out at room temperature, and the experimental data conformed to the Langmuir model, which suggested that the adsorption of RR-2BF onto magnetic NiFe₂O₄ nanoparticles was the monolayer adsorption process. The magnetic NiFe₂O₄ nanoparticles revealed good reusability, and the adsorption capacity was maintained over 80% of the initial capacity after being used for five cycles.