Highly porous and monodisperse magnetic silica beads prepared by a green templating method

We describe the preparation of magnetic silica nanocomposite millimetric beads using alginate as a green biopolymer template. The simple and soft method which is used here is particularly suitable since the alginate template allows a multiscale control of the structure of the material, both its morp...

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Bibliographic Details
Published in:Journal of materials chemistry 2010-01, Vol.20 (23), p.4916-4924
Main Authors: Abramson, Sébastien, Meiller, Clémentine, Beaunier, Patricia, Dupuis, Vincent, Perrigaud, Laurent, Bée, Agnès, Cabuil, Valérie
Format: Article
Language:English
Subjects:
Alginates
Beads
Catalysis
Chemical Sciences
Mathematical models
Nanomaterials
Nanoparticles
Nanostructure
Porosity
Silicon dioxide
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Summary:We describe the preparation of magnetic silica nanocomposite millimetric beads using alginate as a green biopolymer template. The simple and soft method which is used here is particularly suitable since the alginate template allows a multiscale control of the structure of the material, both its morphological characteristics at the millimetric scale and its porosity at the nanometric level. These nanocomposites are characterised by a high monodispersity, a perfect spherical shape, a very large and multiscale porosity with pore diameters ranging from 2 nm to more than 50 nm, a homogeneous dispersion of the magnetic nanoparticles in the silica matrix and a high magnetic susceptibility which increases linearly with the volume fraction of the nanoparticles. These highly porous materials which can be used as magnetic adsorbents in water treatment, showed a good sorption capacity for methylene blue, chosen as a model dye.
ISSN:0959-9428
1364-5501
DOI:10.1039/c000525h