Chitosan-Coated Magnetic Nanoparticles Prepared in One-Step by Precipitation in a High-Aqueous Phase Content Reverse Microemulsion
| Autor: | María Guadalupe Pineda, Silvia Torres, Luis Valencia López, Francisco Javier Enríquez-Medrano, Ramón Díaz de León, Salvador Fernández, Hened Saade, Raúl Guillermo López |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Molecules, Vol 19, Iss 7, Pp 9273-9287 (2014) |
| Druh dokumentu: | article |
| ISSN: | 1420-3049 19079273 |
| DOI: | 10.3390/molecules19079273 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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