amino functionalized silica coated fe3o4 magnetic nanoparticles as a novel adsorbent for removal of pb^2+ and cd^2+

The present study synthesizes a novel adsorbent by coating fe3o4 magnetic nanoparticles with amino functionalized mesoporous silica. the ftir spectrums indicate that silica has been successfully coated on the surface of fe3o4 and 3-aminopropyl tri methoxysilane compound have been grafted to the surface of silica-coated fe3o4. the xrd analysis shows the presence of magnetite phase with cubic spinel as a highly crystalline structure, before and after silica coating. the study also investigates the potentials of amino functionalized silica-coated fe3o4 magnetic nanoparticles for extraction of pb^2+ and cd^2+ cations from aqueous solutions, where it has used flame atomic absorption spectrometry to determine ion concentration in both recovery and sample solutions. the optimum conditions of removal of pb^2+ and cd^2+ ions turn out to be ph= 4-8 with a stirring time of 20 minutes. the minimum amount of 3m nitric acid to strip ions from functionalized magnetic nanoparticles is 10 ml. the experimental data show the adsorption isotherms have been well described by langmuir isotherm model, with the maximum capacity of the adsorbent being 1000.0 (± 1.4) μg, 454.5 (± 1.6) μg of pb^2+, and cd^2+ per each mg of functionalized magnetic nanoparticles, respectively. finally, the proposed adsorbent is successfully applied to remove pb^2+ and cd^2+ ions in wastewater samples.