title: Fenton-like processes and adsorption using iron oxide-pillared clay with magnetic properties for organic compound mitigation.
abstract: In this work, a new step was added to the classic route of iron-pillared clay obtention, resulting in a material with both magnetic and oxidative properties. The saturation of the material surface intercalated with trinuclear acetate-hydroxo iron (III) nitrate in glacial acetic acid atmosphere before heat treatment promoted magnetic phase formation (FePMAG). The material was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), nitrogen adsorption/desorption isotherms, scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS), and X-ray photoelectron spectroscopy (XPS). FePMAG showed an increase of 0.57 nm in basal spacing which contributed to the specific surface area increase from 39.1 to 139.2 m(2)/g. The iron phase identified by XRD and XPS was maghemite, with a little presence of hematite formed by the trinuclear acetate-hydroxo iron (III) nitrate decomposition during heat treatment. In the adsorption tests, FePMAG displayed a good capacity for organic dye methylene blue (MB) removal, reaching 41 % at 150 min. Under photo-Fenton conditions, the material showed an excellent MB oxidation capacity, completely removing the color of the solution within 90 min. Identification of the oxidation products with lower molecular (m/z = 160, 220, and 369) mass was performed by electrospray ionization mass spectroscopy (ESI-MS).
authors.affiliation: Department of Chemistry, Federal University of Lavras, Lavras, MG, 37200-000, Brazil, aatireli@gmail.com.
authors.forename: Aline Auxiliadora
authors.initials: AA
authors.lastname: Tireli
authors.forename: Iara do Rosário
authors.initials: Ido R
authors.lastname: Guimarães
authors.forename: Júlio César de Souza
authors.initials: JC
authors.lastname: Terra
authors.forename: Robson Rosa
authors.initials: RR
authors.lastname: da Silva
authors.forename: Mário Cesar
authors.initials: MC
authors.lastname: Guerreiro
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D000077215:Clay; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D005290:Ferric Compounds / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry* / Q000302:isolation & purification; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
chemical_list: D000538:Aluminum Silicates; D000077215:Clay; D004396:Coloring Agents; D005290:Ferric Compounds; D009930:Organic Chemicals; D062065:Wastewater; D014874:Water Pollutants, Chemical; C000499:ferric oxide