Issue 16, 2017

Heavy metals removal by EDTA-functionalized chitosan graphene oxide nanocomposites

Abstract

Graphene-based two-dimensional materials have been explored in a variety of applications, including the treatment of heavy-metal-rich water/wastewater. Ethylenediaminetetraacetic acid (EDTA)-functionalized magnetic chitosan (CS) graphene oxide (GO) nanocomposites (EDTA-MCS/GO) were synthesized using a reduction precipitation method and applied to the removal of heavy metals, such as Pb2+, Cu2+, and As3+, from aqueous solutions. The synthesized nanocomposite was characterized by FT-IR, XRD, SEM, MPMS, zeta-potential and BET analyses. The influence of various operating parameters, such as pH, temperature, metal ion concentration, and contact time on the removal of the metal ions, was investigated. Owing to the large specific surface area, hydrophilic behavior, and functional moieties, the magnetic nanocomposite demonstrated excellent removal ability with a maximum adsorption capacity of 206.52, 207.26, and 42.75 mg g−1 for Pb2+, Cu2+, and As3+, respectively. The equilibrium data was evaluated by Langmuir and Freundlich isotherms, while the heavy metal adsorption reaction kinetics was analyzed by Lagergren pseudo-first-order and pseudo-second-order kinetic models. The nanocomposite was reused in four successive adsorption–desorption cycles, revealing a good regeneration capacity of the adsorbent.

Graphical abstract: Heavy metals removal by EDTA-functionalized chitosan graphene oxide nanocomposites

Supplementary files

Article information

Article type
Paper
Submitted
19 Dez 2016
Accepted
25 Jan 2017
First published
02 Feb 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 9764-9771

Heavy metals removal by EDTA-functionalized chitosan graphene oxide nanocomposites

A. Shahzad, W. Miran, K. Rasool, M. Nawaz, J. Jang, S. Lim and D. S. Lee, RSC Adv., 2017, 7, 9764 DOI: 10.1039/C6RA28406J

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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