title: Use of iron and bio-oil wastes to produce highly dispersed Fe/C composites for the photo-Fenton reaction.
abstract: This work describes the synthesis, characterization, and application of an active heterogeneous photo-Fenton system obtained from two different wastes, i.e., laterite (an iron mining waste) and the acid aqueous fraction (AAF) from bio-oil production. AAF with high acidity (ca. 3 molH+L-1) and organic concentration (25 wt.%) obtained from biomass flash pyrolysis was used for the efficient extraction of Fe3+from laterite waste. After extraction, the mixture Fe3+/AAF was dried and treated at different temperatures, i.e., 500, 650, and 800 °C, to obtain Fe/C reactive composites. Mössbauer, XRD, TG, elemental analyses, and SEM/EDS showed the presence of highly disperse Fe oxide nanoparticles at 500 and 650 °C and Fe0particles in the material obtained at 800 °C with carbon contents varying from 74 to 80 %. The three composites were tested as heterogeneous catalysts in the photo-Fenton reaction for the oxidation of the model dye contaminant methylene blue, showing high activities at neutral pH.
authors.affiliation: Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors.forename: Fernanda Gomes
authors.initials: FG
authors.lastname: de Mendonça
authors.affiliation: Departamento de Química, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil.
authors.forename: Marcelo Gonçalves
authors.initials: MG
authors.lastname: Rosmaninho
authors.affiliation: Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors.forename: Philipe Xavier
authors.initials: PX
authors.lastname: da Fonseca
authors.affiliation: Departamento de Engenharia Química, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.
authors.forename: Ricardo Reis
authors.initials: RR
authors.lastname: Soares
authors.affiliation: Laboratório de Física Aplicada, CDTN, Belo Horizonte, MG, Brazil.
authors.forename: José Domingos
authors.initials: JD
authors.lastname: Ardisson
authors.affiliation: Universidade Federal de Viçosa, Florestal, MG, Brazil.
authors.forename: Juliana Cristina
authors.initials: JC
authors.lastname: Tristão
authors.affiliation: Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil. rochel@ufmg.br.
authors.forename: Rochel Montero
authors.initials: RM
authors.lastname: Lago
mesh_terms: D002244:Carbon / Q000737:chemistry*; D006358:Hot Temperature; D007220:Industrial Waste / Q000032:analysis*; D058085:Iron Compounds / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*
chemical_list: D002244:Carbon; D007220:Industrial Waste; D058085:Iron Compounds; D062065:Wastewater
keywords: Acid aqueous fraction; Bio-oil; Fe/C composites; Laterite; Photo-Fenton