title: Synthesis, characterization and adsorptive properties of carbon with iron nanoparticles and iron carbide for the removal of As(V) from water.
abstract: This manuscript presents the synthesis of carbon modified with iron nanoparticles (CFe) and iron carbide (CarFe) from the pyrolyzed crown leaves of pineapple (Ananas comosus) treated with iron salts. The materials that were obtained were used for the removal of As(V) from aqueous media. The carbonaceous materials were characterized by Scanning Electron Microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), X-Ray Photoelectron Spectroscopy (XPS) and Mossbauer Spectroscopy. The specific area (BET), number site density and point of zero charge (pH(pzc)) were also determined. The kinetic parameters were obtained by fitting the experimental data to the pseudo-first-order and pseudo-second-order models. Different isotherm models were applied to describe the As(V) adsorption behavior. The kinetics of As(V) sorption by CFe and CarFe was well defined for the pseudo-second-order model (R(2) = 0.9994 and 0.999, respectively). The maximum As(V) uptake was 1.8 mg g(-1) for CFe and 1.4 mg g(-1) for CarFe. The results obtained indicated that both materials are equally useful for As(V) sorption. The As(V) experimental isotherm data were described by the Freundlich model for CFe and CarFe.
authors.affiliation: Instituto Tecnológico de Toluca, Departamento de posgrado, Ex-rancho la virgen S/N, C.P. 50120 Metepec, Mexico.
authors.forename: O E
authors.initials: OE
authors.lastname: Gutierrez-Muñiz
authors.forename: G
authors.initials: G
authors.lastname: García-Rosales
authors.forename: E
authors.initials: E
authors.lastname: Ordoñez-Regil
authors.forename: M T
authors.initials: MT
authors.lastname: Olguin
authors.forename: A
authors.initials: A
authors.lastname: Cabral-Prieto
mesh_terms: D000327:Adsorption; D031230:Ananas / Q000737:chemistry*; D001151:Arsenic / Q000302:isolation & purification*; D017554:Carbon Compounds, Inorganic / Q000138:chemical synthesis; D007501:Iron / Q000737:chemistry*; D058085:Iron Compounds / Q000138:chemical synthesis; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D056951:Photoelectron Spectroscopy; D015204:Spectroscopy, Mossbauer; D013499:Surface Properties; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction
chemical_list: D017554:Carbon Compounds, Inorganic; D058085:Iron Compounds; D014874:Water Pollutants, Chemical; C541825:iron carbide; D007501:Iron; D001151:Arsenic