Adsorption performance of reactive red 2BF onto magnetic Zn_0.3Cu_0.7Fe₂O₄ nanoparticles

The facile solution combustion and gel calcination process was applied to prepare magnetic Zn_0.3Cu_0.7Fe₂O₄ nanoparticles, and the characterization of the product was analyzed by SEM, TEM, XRD, and VSM techniques. The magnetic Zn_0.3Cu_0.7Fe₂O₄ nanoparticles prepared with absolute alcohol volume of 15 ml at 600 °C were expressed with the average particle size of approximately 60 nm and the saturation magnetization of 39.2 emu g⁻¹. Where after, Zn_0.3Cu_0.7Fe₂O₄ nanoparticles were applied to remove reactive red 2BF (RR-2BF), and at room temperature, the adsorbance of RR-2BF onto them was examined. The results demonstrated that pseudo-second-order kinetics could well express the adsorption process, and Temkin isotherm conformed to experimental data. The adsorption capacity of the sample could reach 130 mg g⁻¹, which was greatly affected by pH. The acidic environment was conducive to adsorption while the alkaline environment was conducive to desorption. Moreover, the material had excellent cycling performance. (paper)