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Chitosan-Coated Magnetic Nanoparticles Prepared in One Step by Reverse Microemulsion Precipitation
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; in revised form: 5 September 2013 / Accepted: 12 September 2013 / Published: 27 September 2013
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
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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.
López RG, Pineda MG, Hurtado G, León RD, Fernández S, Saade H, Bueno D. Chitosan-Coated Magnetic Nanoparticles Prepared in One Step by Reverse Microemulsion Precipitation. International Journal of Molecular Sciences. 2013; 14(10):19636-19650.
López, Raúl G.; Pineda, María G.; Hurtado, Gilberto; León, Ramón D.; Fernández, Salvador; Saade, Hened; Bueno, Darío. 2013. "Chitosan-Coated Magnetic Nanoparticles Prepared in One Step by Reverse Microemulsion Precipitation." Int. J. Mol. Sci. 14, no. 10: 19636-19650.