Switchable Transport Strategy to Deposit Active Fe/Fe3C Cores into Hollow Microporous Carbons for Efficient Chromium Removal

Authors

  • Dong-Hai Liu,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Faculty of Chemical, Environmental, and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China
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  • Yue Guo,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Faculty of Chemical, Environmental, and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China
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  • Lu-Hua Zhang,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Faculty of Chemical, Environmental, and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China
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  • Wen-Cui Li,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Faculty of Chemical, Environmental, and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China
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  • Tao Sun,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Faculty of Chemical, Environmental, and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China
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  • An-Hui Lu

    Corresponding author
    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Faculty of Chemical, Environmental, and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China
    • State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Faculty of Chemical, Environmental, and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China.

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Abstract

Magnetic hollow structures with microporous shell and highly dispersed active cores (Fe/Fe3C nanoparticles) are rationally designed and fabricated by solution-phase switchable transport of active iron species combined with a solid-state thermolysis technique, thus allowing selective encapsulation of functional Fe/Fe3C nanoparticles in the interior cavity. These engineered functional materials show high loading (≈54 wt%) of Fe, excellent chromium removal capability (100 mg g−1), fast adsorption rate (8766 mL mg−1 h−1), and easy magnetic separation property (63.25 emu g−1). During the adsorption process, the internal highly dispersed Fe/Fe3C nanoparticles supply a driving force for facilitating CrVI diffusion inward, thus improving the adsorption rate and the adsorption capacity. At the same time, the external microporous carbon shell can also efficiently trap guest CrVI ions and protect Fe/Fe3C nanoparticles from corrosion and subsequent leaching problems.

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