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Molecules 2014, 19(7), 9273-9287; doi:10.3390/molecules19079273
Article

Chitosan-Coated Magnetic Nanoparticles Prepared in One-Step by Precipitation in a High-Aqueous Phase Content Reverse Microemulsion

, , , , , ,  and *
Received: 27 May 2014; in revised form: 25 June 2014 / Accepted: 25 June 2014 / Published: 2 July 2014
(This article belongs to the Special Issue Bio and Nanomaterials Based on Fe3O4)
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Abstract: Chitosan-coated magnetic nanoparticles (CMNP) were prepared in one-step by precipitation in a high-aqueous phase content reverse microemulsion in the presence of chitosan. The high-aqueous phase concentration led to productivities close to 0.49 g CMNP/100 g microemulsion; much higher than those characteristic of precipitation in reverse microemulsions for preparing magnetic nanoparticles. The obtained nanoparticles present a narrow particle size distribution with an average diameter of 4.5 nm; appearing to be formed of a single crystallite; furthermore they present superparamagnetism and high magnetization values; close to 49 emu/g. Characterization of CMNP suggests that chitosan is present as a non-homogeneous very thin layer; which explains the slight reduction in the magnetization value of CMNP in comparison with that of uncoated magnetic nanoparticles. The prepared nanoparticles show high heavy ion removal capability; as demonstrated by their use in the treatment of Pb2+ aqueous solutions; from which lead ions were completely removed within 10 min.
Keywords: chitosan magnetic nanoparticles one-step; heavy metal ion removal; high productivity microemulsion precipitation chitosan magnetic nanoparticles one-step; heavy metal ion removal; high productivity microemulsion precipitation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Pineda, M.G.; Torres, S.; López, L.V.; Enríquez-Medrano, F.J.; de León, R.D.; Fernández, S.; Saade, H.; López, R.G. Chitosan-Coated Magnetic Nanoparticles Prepared in One-Step by Precipitation in a High-Aqueous Phase Content Reverse Microemulsion. Molecules 2014, 19, 9273-9287.

AMA Style

Pineda MG, Torres S, López LV, Enríquez-Medrano FJ, de León RD, Fernández S, Saade H, López RG. Chitosan-Coated Magnetic Nanoparticles Prepared in One-Step by Precipitation in a High-Aqueous Phase Content Reverse Microemulsion. Molecules. 2014; 19(7):9273-9287.

Chicago/Turabian Style

Pineda, María G.; Torres, Silvia; López, Luis V.; Enríquez-Medrano, Francisco J.; de León, Ramón D.; Fernández, Salvador; Saade, Hened; López, Raúl G. 2014. "Chitosan-Coated Magnetic Nanoparticles Prepared in One-Step by Precipitation in a High-Aqueous Phase Content Reverse Microemulsion." Molecules 19, no. 7: 9273-9287.


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