Artigo
Fenton-like processes and adsorption using iron oxide-pillared clay with magnetic properties for organic compound mitigation
Registro en:
Environmental Science And Pollution Research. Heidelberg: Springer Heidelberg, v. 22, n. 2, p. 870-881, 2015.
0944-1344
10.1007/s11356-014-2973-x
WOS:000348047400013
Autor
Tireli, Aline Auxiliadora
Guimarães, Iara do Rosário
Souza Terra, Júlio César de
Silva, Robson Rosa da [UNESP]
Guerreiro, Mario Cesar
Resumen
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). Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Department of Chemistry, Federal University of Lavras, Lavras, MG, 37200-000, Brazil Institute of Chemistry, São Paulo State University, Araraquara, SP, 14801-970, Brazil