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Int. J. Mol. Sci. 2013, 14(10), 19636-19650; doi:10.3390/ijms141019636
Article

Chitosan-Coated Magnetic Nanoparticles Prepared in One Step by Reverse Microemulsion Precipitation

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Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna 140, Saltillo 25294, Coahuila, Mexico These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 31 May 2013 / Revised: 5 September 2013 / Accepted: 12 September 2013 / Published: 27 September 2013
(This article belongs to the Special Issue Magnetic Nanoparticles 2013)
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Abstract

Chitosan-coated magnetic nanoparticles (CMNP) were obtained at 70 °C and 80 °C in a one-step method, which comprises precipitation in reverse microemulsion in the presence of low chitosan concentration in the aqueous phase. X-ray diffractometry showed that CMNP obtained at both temperatures contain a mixture of magnetite and maghemite nanoparticles with ≈4.5 nm in average diameter, determined by electron microscopy, which suggests that precipitation temperature does not affect the particle size. The chitosan coating on nanoparticles was inferred from Fourier transform infrared spectrometry measurements; furthermore, the carbon concentration in the nanoparticles allowed an estimation of chitosan content in CMNP of 6%–7%. CMNP exhibit a superparamagnetic behavior with relatively high final magnetization values (≈49–53 emu/g) at 20 kOe and room temperature, probably due to a higher magnetite content in the mixture of magnetic nanoparticles. In addition, a slight direct effect of precipitation temperature on magnetization was identified, which was ascribed to a possible higher degree of nanoparticles crystallinity as temperature at which they are obtained increases. Tested for Pb2+ removal from a Pb(NO3)2 aqueous solution, CMNP showed a recovery efficacy of 100%, which makes them attractive for using in heavy metals ion removal from waste water.
Keywords: chitosan magnetic nanoparticles; one-step microemulsion precipitation; chitosan low content chitosan magnetic nanoparticles; one-step microemulsion precipitation; chitosan low content
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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López, R.G.; Pineda, M.G.; Hurtado, G.; León, R.D.; Fernández, S.; Saade, H.; Bueno, D. Chitosan-Coated Magnetic Nanoparticles Prepared in One Step by Reverse Microemulsion Precipitation. Int. J. Mol. Sci. 2013, 14, 19636-19650.

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