title: Biosorption of chromium by alginate extraction products from Sargassum filipendula: investigation of adsorption mechanisms using X-ray photoelectron spectroscopy analysis.
abstract: The alginate extraction products from Brazilian brown seaweed Sargassum filipendula were studied for chromium biosorption. Batch experiments were conducted at pH 2 and 3 and 20°C to determine the sorption capacity of this biosorbents for chromium (VI) and (III). The biomass was characterized before and after metal binding by X-ray photoelectron spectroscopy (XPS) in order to determine the mechanisms of chromium biosorption. The residue has a high adsorption capacity, close the value obtained with seaweed and higher than that of alginate for both Cr(III) and Cr(VI). XPS analysis of the biosorbents revealed that carboxyl, amino and sulfonate groups are responsible for the binding of the metal ions. The analysis also indicated that the Cr(VI) bound to the biomass was reduced to Cr(III).
authors.affiliation: School of Chemical Engineering, University of Campinas, Cidade Universitária Zeferino Vaz, 13083-970 Campinas, SP, Brazil; Centre des Matériaux des Mines d'Alès (C2MA/MPA/BCI), Ecole des mines d'Alès, 6 avenue de Clavières, F-30319 Alès Cedex, France. Electronic address: carolinebertagnolli@gmail.com.
authors.forename: Caroline
authors.initials: C
authors.lastname: Bertagnolli
authors.affiliation: Institut des sciences analytiques et de physico-chimie pour l'environnement et les matériaux (IPREM), Université de Pau et des Pays de l'Adour, 2 avenue Président Angot, F-64053 Pau, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Uhart
authors.affiliation: Institut des sciences analytiques et de physico-chimie pour l'environnement et les matériaux (IPREM), Université de Pau et des Pays de l'Adour, 2 avenue Président Angot, F-64053 Pau, France.
authors.forename: Jean-Charles
authors.initials: JC
authors.lastname: Dupin
authors.affiliation: School of Chemical Engineering, University of Campinas, Cidade Universitária Zeferino Vaz, 13083-970 Campinas, SP, Brazil.
authors.forename: Meuris Gurgel Carlos
authors.initials: MG
authors.lastname: da Silva
authors.affiliation: Centre des Matériaux des Mines d'Alès (C2MA/MPA/BCI), Ecole des mines d'Alès, 6 avenue de Clavières, F-30319 Alès Cedex, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Guibal
authors.affiliation: Institut des sciences analytiques et de physico-chimie pour l'environnement et les matériaux (IPREM), Université de Pau et des Pays de l'Adour, 2 avenue Président Angot, F-64053 Pau, France.
authors.forename: Jacques
authors.initials: J
authors.lastname: Desbrieres
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002857:Chromium / Q000302:isolation & purification*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D007700:Kinetics; D056951:Photoelectron Spectroscopy / Q000379:methods*; D044647:Sargassum / Q000737:chemistry*; D013816:Thermodynamics; D013997:Time Factors
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D002857:Chromium; D020723:Glucuronic Acid
keywords: Alginate-extraction; Biosorption; Chromium; Seaweed; XPS