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Hexavalent Chromium Removal over Magnetic Carbon Nanoadsorbent: Synergistic Effect of Fluorine and Nitrogen Co-doping

Abstract

Fluorine and nitrogen co-doped magnetic carbons (FN-MCs) were obtained through a facile pyrolysis-carbonization processes. The physical- and chemical- properties of FN-MCs were comprehensively studied by various characterizations. FN-MCs were applied as adsorbents for the removal of chromium(VI) ions from the aqueous solutions. The adsorption performance and kinetic characteristics were evaluated in batch mode. The results showed that the FN-MCs displayed an enhanced removal efficiency in the neutral solution, higher than the solo N or F doped adsorbent. The highest removal capacity in both neutral and acidic solution was 188.7 and 740.7 mg g-1, respectively, competitive with the state-of-the-art of the carbon adsorbents. The unexpected high adsorption performance in the neutral solution can be attributed to the incorporation of the fluorine and nitrogen atoms simultaneous, which increased the negative charge density on the surface of adsorbent. The removal efficiency increased alone with the content of the heteroatoms and the defect value. The density functional theory (DFT) calculations demonstrated that the F and N co-doping reduced the adsorption energy between the Cr(VI) ions and adsorbent, thus boosted the adsorption efficiency in the neutral solution. Furthermore, the FN-MC showed high stability with the recycling tests for the Cr(VI) removal.

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Publication details

The article was received on 28 Mar 2018, accepted on 30 May 2018 and first published on 31 May 2018


Article type: Paper
DOI: 10.1039/C8TA02861C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Hexavalent Chromium Removal over Magnetic Carbon Nanoadsorbent: Synergistic Effect of Fluorine and Nitrogen Co-doping

    J. Huang, Y. Li, Y. Cao, F. Peng, Y. Cao, Q. Shao, H. Liu and Z. Guo, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02861C

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