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Experimental and Theoretical Calculation Investigation on Efficient Pb(II) Adsorption to Etched Ti3AlC2 Nanofibers and Nanosheets

Abstract

Nanofibers and nanosheets of Layered 2D etched Ti3AlC2 with different morphologies (named as e-TACFs and e-TACSs) were successfully synthesized by simple hydrothermal treatment. The adsorption of Pb(II) on e-TACFs and e-TACSs under various conditions were 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 two samples were spontaneous and endothermic. Specifically, due to its 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•g-1, which was higher than that of Pb(II) on e-TACSs (218.3 mg•g-1). The interaction mechanisms of Pb (II) with e-TACFs and e-TACSs were mainly attributed to the cation exchange and outer-sphere surface complexion, 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 fluoride-free hydrothermal synthesis method and excellent heavy metal removal capacity demonstrated that 2D etched Ti3AlC2 nanomaterials were promising materials for the efficient removal of Pb(II) in the environmental pollution remediation.

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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, Accepted Manuscript
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    Experimental and Theoretical Calculation Investigation on Efficient Pb(II) Adsorption to Etched Ti3AlC2 Nanofibers and Nanosheets

    X. Wang, P. Gu, J. XING, T. Wen, R. Zhang, J. Wang, G. Zhao, T. Hayat, Y. Ai and L. Zhang, Environ. Sci.: Nano, 2018, Accepted Manuscript , DOI: 10.1039/C8EN00029H

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