adsorption of copper, zinc and lead metal ions from aqueous samples using fe3o4 magnetic nanoparticles modified with alizarin red s

Fe3o4 magnetic nanoparticles modified with alizarin red s (ars-fe3o4) were used for the removal of several metal ions from aqueous solution. the mean size and the surface morphology of the nanoparticles were characterized by tem, xrd and ftir techniques. adsorption studies of mentioned metal ions were performed in batch system. the adsorption of metal ions onto ars-fe3o4 nanoparticles was affected by the several analytical parameters such as an initial ph, metal ions concentration, adsorbent amount, contact time and temperature. experimental results indicated that ars-fe3o4 nanoparticles were quantitatively removed. the maximum adsorption capacities of ars-fe3o4 for the langmuir model were 50.0, 22.7 and 21.7 mg of metal ions per gram of nanoparticle for zn^2+, cu^2+ and pb^2+, respectively. the isotherm evaluations revealed that the langmuir model attained better fits to the equilibrium data than the othermodels. the kinetic data of adsorption of zn^2+, cu^2+ and pb^2+ ions on the synthesized adsorbents were best described by pseudo-second-order equation. the adsorption processesfor three metal ions were endothermic. metal ions were desorbed from nanoparticles by 2 mlhcl solution 0.1 mol l^−1.