title: 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.
authors.affiliation: Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25294 Saltillo, Coahuila, Mexico.
authors.forename: María Guadalupe
authors.initials: MG
authors.lastname: Pineda
authors.affiliation: Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25294 Saltillo, Coahuila, Mexico.
authors.forename: Silvia
authors.initials: S
authors.lastname: Torres
authors.affiliation: Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25294 Saltillo, Coahuila, Mexico.
authors.forename: Luis Valencia
authors.initials: LV
authors.lastname: López
authors.affiliation: Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25294 Saltillo, Coahuila, Mexico.
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Enríquez-Medrano
authors.affiliation: Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25294 Saltillo, Coahuila, Mexico.
authors.forename: Ramón Díaz
authors.initials: RD
authors.lastname: de León
authors.affiliation: Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25294 Saltillo, Coahuila, Mexico.
authors.forename: Salvador
authors.initials: S
authors.lastname: Fernández
authors.affiliation: Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25294 Saltillo, Coahuila, Mexico.
authors.forename: Hened
authors.initials: H
authors.lastname: Saade
authors.affiliation: Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C.P. 25294 Saltillo, Coahuila, Mexico. guillermo.lopez@ciqa.edu.mx.
authors.forename: Raúl Guillermo
authors.initials: RG
authors.lastname: López
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry; D004655:Emulsions; D005290:Ferric Compounds / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry; D005590:Fractional Precipitation; D006863:Hydrogen-Ion Concentration; D060328:Magnetic Phenomena; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012997:Solvents / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D002712:Chlorides; D004655:Emulsions; D005290:Ferric Compounds; D005296:Ferrous Compounds; D012997:Solvents; D014867:Water; D048271:Chitosan; C029451:ferrous chloride; C024555:ferric chloride