Issue 116, 2016

Preparation and characterization of a series of porous anion-exchanger chelating fibers and their adsorption behavior with respect to removal of cadmium(ii)

Abstract

The aim of the present study was to investigate a series of porous anion-exchanger chelating fibers (PP-g-AA-Am), prepared using polypropylene (PP) for the removal of Cd(II) in non-salt systems and in high-salt complex systems. FTIR, BET, FESEM, and XPS spectra indicated that AA was grafted onto the surface of PP fibers and, subsequently, amino functional groups and amide bonds were introduced by the amide reaction. A batch experimental study indicated that the adsorption of Cd(II) could be well-fitted with the pseudo-second-order kinetic model and the Freundlich isotherm. Thermodynamic studies indicated that the adsorption reaction was a spontaneous and endothermic process. Because of the electrostatic interactions and coordination bonds between Cd(II) and PP-g-AA-Am fibers, the resulting adsorption capacities are as follows: PP-g-AA-EDA (125.34 mg g−1), PP-g-AA-DETA (116.15 mg g−1), PP-g-AA-TETA (93.02 mg g−1) and PP-g-AA-TEPA (81.01 mg g−1). The presence of high-salt NaCl solution, as well as CaCl2, KCl and MgCl2, did not significantly affect the Cd(II) adsorption process, whereas strongly acidic or strongly alkaline conditions were unfavorable. In addition, the reusability of the obtained fibers, without a significant deterioration in performance, was demonstrated with at least five repeated cycles.

Graphical abstract: Preparation and characterization of a series of porous anion-exchanger chelating fibers and their adsorption behavior with respect to removal of cadmium(ii)

Supplementary files

Article information

Article type
Paper
Submitted
31 Aug 2016
Accepted
01 Dec 2016
First published
02 Dec 2016

RSC Adv., 2016,6, 115222-115237

Preparation and characterization of a series of porous anion-exchanger chelating fibers and their adsorption behavior with respect to removal of cadmium(II)

M. Liu, Z. Tao, H. Wang, F. Zhao and Q. Sun, RSC Adv., 2016, 6, 115222 DOI: 10.1039/C6RA21713C

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