Issue 4, 2018

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

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 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 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

Supplementary files

Article information

Article type
Paper
Submitted
07 Jan 2018
Accepted
13 Feb 2018
First published
14 Feb 2018

Environ. Sci.: Nano, 2018,5, 946-955

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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