Issue 76, 2016, Issue in Progress

Adsorptive removal of toxic metals and cationic dyes by magnetic adsorbent based on functionalized graphene oxide from water

Abstract

In this study, a new magnetic nanocomposite adsorbent was prepared from amino-silane functionalized graphene oxide (GO-APTS) and a copolymer of 2-acrylamido-2-methylpropanesulfonic acid (AMPS)/maleic anhydride (MA) [poly(AMPS-co-MA)], and adsorptive removal of Pb(II), Cu(II) and Co(II) and cationic dyes such as crystal violet (CV) and methylene blue (MB) from water was investigated. The magnetic adsorbent GO-APTS-poly(AMPS-co-MA)/Fe3O4 was characterized by the Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and thermogravimetric analysis (TGA). The effect of different factors on adsorption efficiency such as pH, adsorbent dosage, contact time, the concentration of adsorbates and temperature were investigated. The adsorption results fitted well with the Langmuir isotherm and pseudo-second-order kinetic model. The maximum adsorption capacity (Qm) was 310.10, 282.25, 238.35, 416.06 and 440.97 mg g−1 for Pb(II), Cu(II), Co(II), MB and CV, respectively. The adsorption was proposed to be chemisorption, spontaneous, and endothermic. The adsorbent was regenerated by several adsorptions/desorption processes. The prepared adsorbent can be highly efficient, magnetically separable and reusable for water purification.

Graphical abstract: Adsorptive removal of toxic metals and cationic dyes by magnetic adsorbent based on functionalized graphene oxide from water

Article information

Article type
Paper
Submitted
18 May 2016
Accepted
25 Jul 2016
First published
25 Jul 2016

RSC Adv., 2016,6, 72487-72499

Adsorptive removal of toxic metals and cationic dyes by magnetic adsorbent based on functionalized graphene oxide from water

R. Sahraei, K. Hemmati and M. Ghaemy, RSC Adv., 2016, 6, 72487 DOI: 10.1039/C6RA12934J

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