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Highly efficient Pb(II) and Cu(II) removal using hollow Fe3O4@PDA nanoparticles with excellent application capability and reusability

Abstract

Potentially toxic metals in sewage and industrial effluents have posed a serious threaten to human health and eco-environment. Herein, novel core-shell hollow magnetic polydopamine nanoparticles (denoted as Fe3O4@PDA) were fabricated by a novel one-pot synthesis method and applied for the elimination of Pb(II) and Cu(II) from wastewater. The versatile polydopamine (PDA) layer with abundant functional groups (amine, imine and catechol groups) provided the favourable sites to bind metal ions. The experimental results showed that the adsorption processes were significantly affected by the pH values of the suspension. The ionic strength-independent adsorption processes indicated the existence of inner-sphere surface complexes of Pb(II) and Cu(II) on Fe3O4@PDA. The kinetic studies showed that Fe3O4@PDA had the ultrafast removal for Pb(II) and Cu(II), which achieved equilibration within 3 h or less. The adsorption processes were well fitted by the pseudo-second-order kinetics model and Langmuir isotherm model. It was found that the removal capacities of Fe3O4@PDA were calculated to be 57.25 mg·g-1 for Pb(II) and 86.35 mg·g-1 for Cu(II), which were much higher than those of pure Fe3O4 and other materials. Most importantly, the adsorption efficiencies of Pb(II) and Cu(II) on Fe3O4@PDA were still ~ 75% and ~ 72% after three cycles, respectively. In summary, hollow Fe3O4@PDA nanoparticles could be used as outstanding materials for the elimination of Pb(II) and Cu(II), which were beneficial to reduce the toxic effects of the heavy metal ions contaminated water.

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Publication details

The article was received on 08 Jun 2018, accepted on 09 Jul 2018 and first published on 10 Jul 2018


Article type: Research Article
DOI: 10.1039/C8QI00541A
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Highly efficient Pb(II) and Cu(II) removal using hollow Fe3O4@PDA nanoparticles with excellent application capability and reusability

    X. Wang, N. Wang, D. Yang, X. Wang, S. Yu, H. Wang, T. Wen, G. Song and Z. Yu, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00541A

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