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Efficient removal of uranium(VI) from simulated seawater using amidoximated polyacrylonitrile/FeOOH composites

Abstract

The ability to recover uranium, an important nuclear fuel, from seawater provides the potential for long-term sustainable fuel supply of nuclear energy. In this work, novel amidoximated polyacrylonitrile/FeOOH (FeOOH-APAN) composites were synthesized and characterized by CHN analysis, Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption-desorption, and X-ray photoelectron spectroscopy (XPS). In batch adsorption experiments, a variety of parameters were investigated in detail. The FeOOH-APAN composites exhibit high adsorption capacities (qm = 980.39 mg g-1, T=298 K), superior to many other materials. In addition, they possess large Kd values (> 104 mL g-1 at 25-400 mg L-1 U concentration), high removal rates (∼95% at 25−300 mg L-1, and ∼90% for ppb level simulated seawater), excellent selectivity and rapid capturing rates for uranium. XPS analysis shows that the removal of uranium is mainly related to amidoxime groups, involving interaction with oxime oxygen and oxime nitrogen. In this paper, a more dominant binding mode is proposed, namely η2 coordination.

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Publication details

The article was received on 14 Jun 2017, accepted on 13 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT02164J
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Efficient removal of uranium(VI) from simulated seawater using amidoximated polyacrylonitrile/FeOOH composites

    X. Wei, Q. Liu, H. Zhang, Z. Lu, J. Liu, R. Chen, R. Li, Z. Li, P. Liu and J. Wang, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02164J

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