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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 *
Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25294 Saltillo, Coahuila, Mexico
* Author to whom correspondence should be addressed.
Received: 27 May 2014 / Revised: 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 (CC BY 3.0).
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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.

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