The Treatment of Waste Waters Containing Heavy Metals by Magnetic Nanoparticles

This study presents the synthesis and the characterization of the structural and sorption properties of magnetic nanoscale particles, which play a significant role in wastewater treatment technologies.Aqueous suspensions of magnetic particles were prepared by co-precipitation of Fe(III) and Fe(II) in the presence of NH4OH. Adsorption of heavy metal ions adsorption from single metal aqueous solutions was investigated in batch adsorptionequilibrium experiments. Magnetic particles were used in the adsorption of selected bivalent heavy metal ions, i.e. Cd(II), Cu(II) and Pb(II) from aqueous media containing different amounts of these ions (20400 mg.l-1) and at different pH values of 2.0-8.0 at the sorbent concentration of 2 g.l-1. The model solutions of Cu(NO3) 2, Cd(NO3) 2, Pb(NO3)2 were used to realize the adsorption tests. The pH of the solutions was adjusted with a suitable concentration of NaOH and HNO3.Based on the experimental results it was observed that heavy metal ions could be adsorbed by nanoscale magnetic particles with the significant adsorption capacity