Facile Synthesis of Carboxy-terminated Fe3O4@polyamidoamine Nanocomposite for Efficient Removal of Toxic Heavy Metal Contaminants

The carboxy-terminated Fe3O4@polyamidoamine nanocomposites (Fe3O4@PDA@PAMAM-COOH) were successfully synthesized. The adsorption and reusability of obtained Fe3O4@PDA@PAMAM-COOH for Cu(II), Pb(II), Cd(II) and Hg(II) were investigated briefly. The obtained Fe3O4@PDA@PAMAM-COOH have adsorption capacities as high as 199.2, 314.5, 177.6 and 228.8 mg·g-1for Cu(II), Pb(II), Cd(II) and Hg(II) obtained at pH = 7, 7, 8 and 8, respectively. All the adsorption processes are in conformity with pseudo-second-order kinetics and the Langmuir isotherm model. Moreover, the Fe3O4@PDA@PAMAM-COOH possesses excellent long-term stability.The carboxy-terminated Fe3O4@polyamidoamine nanocomposites (Fe3O4@PDA@PAMAM-COOH) were successfully synthesized through amino-terminated Fe3O4@PDA@PAMAM preparation, Michael addition with methyl acrylate and oxidization of terminal ester groups. The obtained Fe3O4@PDA@PAMAM-COOH have adsorption capacities as high as 199.2, 314.5, 177.6 and 228.8 mg·g-1for Cu(II), Pb(II), Cd(II) and Hg(II) obtained at pH = 7, 7, 8 and 8, respectively.