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Self-assembly of a graphene oxide/MnFe2O4 motor by coupling shear force with capillarity for removal of toxic heavy metals

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Abstract

Herein, we have developed an easy method for the fabrication of hollow three-dimensional (3D) graphene oxide/MnFe2O4 (GO/MnFe2O4) motors by mediating GO suspension with aniline and MnFe2O4 via coupling shear force with capillarity. It is found that shear force helps the size breakup of GO/MnFe2O4 hydrogels and the formation of turbulent flow structures during their assembly. Furthermore, capillarity further shrinks their sizes and produces an asymmetric hollow Janus-like GO/MnFe2O4 motor at the millimeter scale during the drying process. In addition, the GO/MnFe2O4 motor demonstrates high efficiency as an adsorbent for the removal of heavy metals (i.e., Pb2+ and Cd2+) because of the rich oxygen-containing groups of GO. MnFe2O4 enables external magnetic control and functions as an engine decomposing H2O2 fuel for bubble-driven movement of motors in the target area. Typically, 20 mg GO/MnFe2O4 motor can fully remove 100 mg L−1 Pb2+ and Cd2+ in 150 min and 180 min, respectively. Furthermore, the motor can be reused and retains 99.8% adsorption efficiency in the fifth cycle after chemical detachment of Pb2+ and Cd2+ with 0.2 M HCl from the surface of GO/MnFe2O4.

Graphical abstract: Self-assembly of a graphene oxide/MnFe2O4 motor by coupling shear force with capillarity for removal of toxic heavy metals

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Publication details

The article was received on 11 Jul 2018, accepted on 27 Sep 2018 and first published on 04 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA06663A
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Self-assembly of a graphene oxide/MnFe2O4 motor by coupling shear force with capillarity for removal of toxic heavy metals

    X. Peng, F. Gao, J. Zhao, J. Li, J. Qu and H. Fan, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA06663A

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