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Issue 46, 2017, Issue in Progress
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Magnetic, structural and surface properties of functionalized maghemite nanoparticles for copper and lead adsorption

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Abstract

In this study, magnetic nanocomposites were developed and used as adsorbents for lead and copper from aqueous media. Structural, surface, magnetic and textural properties of functionalized maghemite nanoparticles synthesized by alkaline co-precipitation were studied. The surfaces of the iron oxide nanoparticles (Nps) were modified with different chemical agents such as fatty and amino acids, silica (SiO2), mesoporous silica (SBA-15), hydroxyapatite, multiwall carbon nanotubes (MWCNTs) and ethylenediaminetetraacetic acid (EDTA), obtaining NPs with mean particle sizes ranging from 7 to 16 nm according to Rietveld refinement and TEM images analysis. The physicochemical surface properties of the functionalized materials were studied via zeta potential (ζ) and Fourier transform infrared (FTIR) spectroscopy. Mössbauer spectroscopy (MS) as a function of temperature and DC magnetometry were used to study the magnetic properties. The superparamagnetic relaxation was studied by MS. The resolved spectra at 20 K confirm the presence of nanomaghemite phase. Besides, the saturation magnetization varies from 12 to 62 emu g−1. A nitrogen adsorption–desorption technique was used to determine the specific surface area and to study the porous structure. The functionalized γ-Fe2O3 Nps exhibited a Brunauer–Emmett–Teller (BET) specific surface area ranging from 74 to 214 m2 g−1 and revealed remarkable uptake capacities to remove Cu(II) and Pb(II) species from aqueous solutions.

Graphical abstract: Magnetic, structural and surface properties of functionalized maghemite nanoparticles for copper and lead adsorption

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Supplementary files

Article information


Submitted
06 Mar 2017
Accepted
24 May 2017
First published
01 Jun 2017

This article is Open Access

RSC Adv., 2017,7, 28763-28779
Article type
Paper

Magnetic, structural and surface properties of functionalized maghemite nanoparticles for copper and lead adsorption

J. A. Ramos Guivar, E. Sadrollahi, D. Menzel, E. G. Ramos Fernandes, E. O. López, M. M. Torres, J. M. Arsuaga, A. Arencibia and F. J. Litterst, RSC Adv., 2017, 7, 28763 DOI: 10.1039/C7RA02750H

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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