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

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 breakup of GO/MnFe2O4 hydrogels and the formation of spiral structures during their assembly. Furthermore, capillarity further shrinks their sizes and produces asymmetric hollow Janus-like GO/MnFe2O4 motor at micrometer or millimeter scale. In addition, GO/MnFe2O4 motor demonstrates high efficiency as the 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 the engine decomposing H2O2 fuel for bubble-driven movement of motors in the target area. Typically, 20 mg GO/MnFe2O4 adsorbent can fully remove 100 mg L-1 Pb2+ and Cd2+ in 150 min and 180 min, respectively. Furthermore, the adsorbent can be reused and remains 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.

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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, Accepted Manuscript
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    Self-assembly of 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. Y. Qu and H. Fan, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA06663A

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