title: Removal of organic dyes by magnetic alginate beads.
abstract: This study deals with the development of a clean and safe process for water pollution remediation. We have synthesized a magnetic adsorbent in order to develop a solid-phase extraction process assisted by a magnetic field. To follow an 'ecoconception' approach, magnetic beads containing magnetic nanoparticles and activated carbon are prepared with a biopolymer extracted from algae, sodium alginate. The use of renewable bioresources of low cost and those disposable in large amount allows the development of a product with a low impact on the environment. The adsorption properties of activated carbon and magnetic properties of iron oxide nanoparticles are combined to produce an interesting magnetic composite. Synthesis and characterization of the magnetic beads have been reported. Their adsorption capacity was investigated by measuring the removal of two dyes (methylene blue and methyl orange) of different charges from aqueous solutions. The efficiency of the beads has been compared with that of non-encapsulated activated carbon. The effects of initial dye concentration, pH and calcium content of the beads have been studied. Adsorption kinetics experiments have been carried out and the data have been well fitted by a pseudo-second-order equation.
authors.affiliation: Université Pierre et Marie Curie-Paris 6, CNRS UMR 7612, Laboratoire Liquides Ioniques et Interfaces chargées (LI2C) case 51, 4 place Jussieu 75252 Paris, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Rocher
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Siaugue
authors.forename: Valérie
authors.initials: V
authors.lastname: Cabuil
authors.forename: Agnès
authors.initials: A
authors.lastname: Bee
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D007700:Kinetics; D008280:Magnetics; D008751:Methylene Blue / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D000464:Alginates; D001391:Azo Compounds; D004396:Coloring Agents; D005290:Ferric Compounds; D006603:Hexuronic Acids; D014874:Water Pollutants, Chemical; C000499:ferric oxide; C100258:methyl orange; D002244:Carbon; D020723:Glucuronic Acid; D008751:Methylene Blue