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Fabrication of core-shell α-MnO2@polydopamine nanocomposites for the efficient and ultra-fast removal of U(VI) from aqueous solution

Abstract

The development of functional nanoparticles with ultra-fast and high adsorption capacity is an important strategy for wastewater treatment. Herein, α-MnO2@polydopamine nanocomposites (α-MnO2@PDAs) were synthesized with polydopamine coated on α-MnO2 nanowires and were used to remove U(VI) from solutions. The α-MnO2@PDAs possessed large surface area (22.8 m2/g), excellent dispersibility, and abundant surface functional groups. The U(VI) adsorption was obviously influenced by pH rather than ion strength suggesting the inner-sphere surface complexation. The adsorption could reach equilibrium within 5 min, and the kinetics was well fitted by the pseudo-second-order model. The maximum adsorption capacity obtained from Langmuir model at 298 K and different pH was in the order of: pH 5.0 (383.14 mg/g) > 8.0 (213.22 mg/g) > 3.0 (158.73 mg/g), indicating that α-MnO2@PDAs still could remove U(VI) efficiently at pH 8 which was close to the pH of natural waters. Spectroscopic analyses suggested that the favourable adsorption was occurred on the active binding sites, e.g., phenolic O-H and amide functional groups. The higher removal efficiency of α-MnO2@PDAs toward U(VI) was due to electrostatic attraction and surface complexation. Moreover, the practical application of α-MnO2@PDAs in real wastewater treatment was confirmed by the high adsorption capability of U(VI) from natural or synthetic waters.

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Publication details

The article was received on 30 Oct 2018, accepted on 04 Dec 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8DT04326D
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Fabrication of core-shell α-MnO2@polydopamine nanocomposites for the efficient and ultra-fast removal of U(VI) from aqueous solution

    J. Wang, J. Ma, C. Zhang, X. Li, S. Song, T. Wen, M. Fang, X. Tan and X. Wang, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT04326D

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