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Issue 4, 2018
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Experimental and theoretical calculation investigation on efficient Pb(II) adsorption on etched Ti3AlC2 nanofibers and nanosheets

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Abstract

Layered 2D etched Ti3AlC2 nanofibers and nanosheets with different morphologies (named as e-TACFs and e-TACSs) were successfully synthesized by a simple hydrothermal treatment. The adsorption of Pb(II) on e-TACFs and e-TACSs under various conditions was found to be strongly dependent on pH and ionic strength. Thermodynamic parameters calculated from temperature-dependent isotherms showed that the adsorption of Pb(II) on both samples was spontaneous and endothermic. Specifically, due to their enhanced specific surface area and complexation affinity with Pb(II), the maximum adsorption capacity of Pb(II) on e-TACFs at pH 5.0 was 285.9 mg gāˆ’1, which was higher than that of Pb(II) on e-TACSs (218.3 mg gāˆ’1). The interaction mechanisms of Pb(II) with e-TACFs and e-TACSs were mainly attributed to cation exchange and outer-sphere surface complexation, which synergistically promoted the adsorption kinetics and enhanced the adsorption capacity. The DFT computational results were in good agreement with the batch experimental observations. Such a fluoride-free hydrothermal synthesis method and excellent heavy metal removal capacity demonstrate that 2D etched Ti3AlC2 nanomaterials are promising materials for the efficient removal of Pb(II) in environmental pollution remediation.

Graphical abstract: Experimental and theoretical calculation investigation on efficient Pb(ii) adsorption on etched Ti3AlC2 nanofibers and nanosheets

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Publication details

The article was received on 07 Jan 2018, accepted on 13 Feb 2018 and first published on 14 Feb 2018


Article type: Paper
DOI: 10.1039/C8EN00029H
Citation: Environ. Sci.: Nano, 2018,5, 946-955
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    Experimental and theoretical calculation investigation on efficient Pb(II) adsorption on etched Ti3AlC2 nanofibers and nanosheets

    P. Gu, J. Xing, T. Wen, R. Zhang, J. Wang, G. Zhao, T. Hayat, Y. Ai, Z. Lin and X. Wang, Environ. Sci.: Nano, 2018, 5, 946
    DOI: 10.1039/C8EN00029H

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