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Issue 2, 2018
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Ni–Mn LDH-decorated 3D Fe-inserted and N-doped carbon framework composites for efficient uranium(VI) removal

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Abstract

Extraction of uranium from seawater is of great interest because of its potential applications in the nuclear energy field. In this study, we prepared 3D Fe-inserted and N-doped carbon nanosheet frameworks by a polymer-blowing process, followed by decoration with nickel–manganese layered double hydroxide (Fe-NCNF-LDH). Employing SEM, FTIR, XPS, XRD, TEM, and BET techniques, we confirmed the existence of 3D structured porous materials with advantageous interconnectivity to provide a highly accessible freeway for uranium(VI) ionic diffusion. We investigated the removal of uranium(VI) from an aqueous solution (ppm level) and simulated seawater (ppb level) by the Fe-NCNF-LDH composites. The results showed that the adsorption process fitted well with a pseudo-second-order model and Langmuir isotherm model. Based on XRD and XPS, before and after the adsorption of uranium(VI), we proposed a possible sorption mechanism (anion exchange, chemical reduction, and surface complexation). In addition, the Fe-NCNF-LDH composites show good adsorption properties after five adsorption–desorption cycles, which augur well for potential application in the field of the adsorption of uranium from seawater.

Graphical abstract: Ni–Mn LDH-decorated 3D Fe-inserted and N-doped carbon framework composites for efficient uranium(vi) removal

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Publication details

The article was received on 28 Oct 2017, accepted on 21 Dec 2017 and first published on 21 Dec 2017


Article type: Paper
DOI: 10.1039/C7EN01018D
Citation: Environ. Sci.: Nano, 2018,5, 467-475
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    Ni–Mn LDH-decorated 3D Fe-inserted and N-doped carbon framework composites for efficient uranium(VI) removal

    J. Zhu, Q. Liu, J. Liu, R. Chen, H. Zhang, R. Li and J. Wang, Environ. Sci.: Nano, 2018, 5, 467
    DOI: 10.1039/C7EN01018D

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