International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
Vol. 12, No. 4, 2015, pp. 1173-1182
Bioline Code: st15107
Full paper language: English
Document type: Research Article
Document available free of charge
International Journal of Environment Science and Technology, Vol. 12, No. 4, 2015, pp. 1173-1182
© Copyright 2015 - International Journal of Environment Science and Technology
Magnetically recoverable iron oxide–hydroxyapatite nanocomposites for lead removal|
Yang, H.; Masse, S.; Rouelle, M.; Aubry, E.; Li, Y.; Roux, C.; Journaux, Y.; Li, L. & Coradin, T.
were prepared by in situ precipitation of the calcium
phosphate phase in an iron oxide colloidal suspension.
Homogeneous magnetic powders were obtained with iron
oxide content up to 50 wt%, without perturbation of the
magnetite structure nor formation of additional calcium
phosphates. The surface area of the composite powder was
significantly increased after incorporation of magnetite due
to the better apatite particle dispersion. This results in an
increased available reactive surface, favoring lead sorption
and hydroxypyromorphite precipitation, both leading to an
enhanced lead removal capacity of the composite materials.
The magnetic properties of magnetite nanocrystals
were preserved upon association with hydroxyapatite. Full
recovery of the composite powder after lead removal could
be achieved using a simple magnet at a relatively low iron
oxide content (20 wt%). This indicates a strong interaction
between hydroxyapatite and magnetite particles within the
composite powder. The procedure is simple, easily scalable
and involves only environmental friendly materials.
Hydroxyapatite; Magnetic materials; Nanoparticles; Lead
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