One-pot Hydrothermal Synthesis of rGO-Fe3O4 Hybrid Nanocomposite for Removal of Pb(II) via Magnetic Separation

doi:10.1007/s40242-015-4487-6

Abstract

Abstract:

The reduced graphene oxide-Fe₃O₄(rGO-Fe₃O₄) hybrid nanocomposite was prepared via a one-pot facile hydrothermal method for adsorption of heavy metal ions. The results of compositional and morphological characterizations show that the Fe₃O₄ NPs with an average diameter of 20 nm have been uniformly dispersed in rGO sheets. Due to the higher specific surface area of rGO and the magnetic properties of Fe₃O₄ nanoparticles, the prepared rGO-Fe₃O₄ hybrid nanosheets showed good adsorption capacity for the removal of Pb(II) from wastewater by simple magnetic separation. The result of control tests show that the adsorption capacity of rGO-Fe₃O₄can be influenced by the ratio of ferric chloride(FeCl₃) to graphene oxide(GO) during the process of sample preparation and the initial concentration of Pb(II). A better adsorption capacity was 30.68 mg/g at n(FeCl₃)/m(GO) ratio of 1:5(mmol:mg) at pH=7.0 with the initial concentration of Pb(II) ions of 80 mg/L, and the experimental data were well fitted with the Langmuir adsorption model. The composite with absorbed Pb(II) can be easily collected by magnetic separation from wastewater because of the excellent magnetism of Fe₃O₄ NPs. The rGO-Fe₃O₄ hybrid nanocomposite provides an effective and environment-friendly absorbent with great application potential in water purification.

Key words: Graphene, Nanocomposite, Adsorption, Magnetic separation

CAO Wei, MA Yiran, ZHOU Wei, GUO Lin. One-pot Hydrothermal Synthesis of rGO-Fe₃O₄ Hybrid Nanocomposite for Removal of Pb(II) via Magnetic Separation[J]. Chemical Research in Chinese Universities, 2015, 31(4): 508-513.

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One-pot Hydrothermal Synthesis of rGO-Fe₃O₄ Hybrid Nanocomposite for Removal of Pb(II) via Magnetic Separation

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