title: Magnetic alginate beads for Pb(II) ions removal from wastewater.
abstract: A magnetic adsorbent (called magsorbent) was developed by encapsulation of magnetic functionalized nanoparticles in calcium-alginate beads. The adsorption of Pb(II) ions by these magnetic beads was studied and the effect of different parameters, such as initial concentration, contact time and solution pH value on the adsorption of Pb(II) ions was investigated. Our magsorbent was found to be efficient to adsorb Pb(II) ions and maximal adsorption capacity occurred at pH 2.3-6. The classical Langmuir model used to fit the experimental adsorption data showed a maximum sorption capacity close to 100 mg g(-1). The experimental kinetic data were well correlated with a pseudo second-order model, 50% of the Pb(II) ions were removed within 20 min and the equilibrium was attained around 100 min. Moreover our magsorbent was easily collected from aqueous media by using an external magnetic field. These results permitted to conclude that magnetic alginate beads could be efficiently used to remove heavy metals in a water treatment process.
authors.affiliation: UPMC Univ. Paris 06, Physicochimie des Electrolytes Colloïdes et Sciences Analytiques (PECSA) (CNRS UMR 7195), 75252 Paris, France. agnes.bee@upmc.fr
authors.forename: Agnès
authors.initials: A
authors.lastname: Bée
authors.forename: Delphine
authors.initials: D
authors.lastname: Talbot
authors.forename: Sébastien
authors.initials: S
authors.lastname: Abramson
authors.forename: Vincent
authors.initials: V
authors.lastname: Dupuis
mesh_terms: D000464:Alginates; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D059346:Magnets; D008863:Microspheres; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D000464:Alginates; D014874:Water Pollutants, Chemical; D007854:Lead