Chitosan-coated magnetic nanoparticles prepared in one-step by precipitation in a high-aqueous phase content reverse microemulsion.

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.

DOI: 10.3390/molecules19079273

7 Figures and Tables

Cite this paper

@article{Pineda2014ChitosancoatedMN, title={Chitosan-coated magnetic nanoparticles prepared in one-step by precipitation in a high-aqueous phase content reverse microemulsion.}, author={Mar{\'i}a Guadalupe Pineda and Silvia Oliveros Torres and Luis Valencia L{\'o}pez and Francisco Javier Enr{\'i}quez-Medrano and Ram{\'o}n D{\'i}az de Le{\'o}n and Salvador Luis Said y Fern{\'a}ndez and Hened Saade and Ra{\'u}l Guillermo L{\'o}pez}, journal={Molecules}, year={2014}, volume={19 7}, pages={9273-87} }