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Journal of Nanomaterials
Volume 2012 (2012), Article ID 327562, 7 pages
Research Article

Chitosan-Coated Magnetic Nanoparticles with Low Chitosan Content Prepared in One-Step

1Departamentos de Biotecnología y de Química Analítica, Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Boulevard V. Carranza y José Cárdenas Valdés, 25280 Saltillo, COAH, Mexico
2Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Boulevard Enrique Reyna No. 140, 25294 Saltillo, COAH, Mexico

Received 28 June 2012; Revised 4 September 2012; Accepted 5 September 2012

Academic Editor: Renyun Zhang

Copyright © 2012 Yolanda Osuna et al. 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.


Chitosan-coated magnetic nanoparticles (CMNP) were obtained at 50°C in a one-step method comprising coprecipitation in the presence of low chitosan content. CMNP showed high magnetization and superparamagnetism. They were composed of a core of 9.5 nm in average diameter and a very thin chitosan layer in accordance with electron microscopy measurements. The results from Fourier transform infrared spectrometry demonstrated that CMNP were obtained and those from thermogravimetric analysis allowed to determine that they were composed of 95 wt% of magnetic nanoparticles and 5 wt% of chitosan. 67% efficacy in the Pb+2 removal test indicated that only 60% of amino groups on CMNP surface bound to Pb, probably due to some degree of nanoparticle flocculation during the redispersion. The very low weight ratio chitosan to magnetic nanoparticles obtained in this study, 0.053, and the high yield of the precipitation reactions (97%) are noticeable.