Removal of Nickel and Cadmium from Aqueous Solution by Modified Magnetic Nanoparticles

Magnetic nanoparticles modified by olive leaf ash were used in this study for the removal of heavy metal ions from aqueous solutions. The equilibrium adsorption level was determined as a function of solution pH، temperature، contact time، initial adsorbate concentration، and adsorbent dosage. Adsorption isotherms of heavy metal ions on adsorbents were determined and correlated with common isotherm equations such as Langmuir، Freundlich، and Tempkin models. The apparent characters and physical chemistry performance of the magnetic nanoparticles modified by olive leaf ash were investigated by scanning electron microscopy (SEM)، transmition electron microscopy (TEM)، and FT-IR. Results showed that the Langmuir isotherm model was fitted well with adsorption data. Kinetic studies were also carried out using various kinetic models such as Pseudo-first order، Pseudo-second order، Elovich and Intra particle diffusion model. The Pseudo-second order kinetic model was fitted very well with the experimental data. Based on thermodynamic studies، this process was found to be both endothermic and spontaneous and the enthalpy and entropy were found to be negative.