Green Synthesis of Metal Nanoparticles and Magnetic Nanocomposites for Adsorption, Desorption and Preconcentration of Pb(II)

Synthesis, characterization, Pb(II) adsorption, recovery, preconcentration and reusability of different nanoadsorbents were investigated in detail. With green synthesis, silver, iron oxide and iron copper nanoparticles (AgNPs, Fe(3)O(4)NPs and Fe/CuNPs) were synthesized and modified with chitosan and alginate natural polymers to form nanocomposite beads (Fe3O4-CS, Fe3O4-AT, Fe/Cu-CS and Fe/Cu-AT). When the adsorption efficiencies of the seven synthesized nanoadsorbents from the aqueous medium were compared, it was seen that the magnetic bimetallic Fe/Cu-CS beads provided the highest adsorption with 100 % efficiency for Pb(II). The adsorption mechanism, effects of temperature, initial lead ion concentration and pH of the solution on the Pb(II) adsorption capacity of Fe/Cu-CS beads were investigated. The recovery studies have shown that Fe/Cu-CS beads have good adsorption/desorption performance around 90 % of desorption was achieved with 5 mM HNO3. These results show that Fe/Cu-CS beads have potential to be a promising material for adsorption, preconcentration and desorption of Pb(II) from aqueous solution.