title: Hydrotalcite-TiO2 magnetic iron oxide intercalated with the anionic surfactant dodecylsulfate in the photocatalytic degradation of methylene blue dye.
abstract: The new magnetic photocatalysts HT/TiO2/Fe and HT-DS/TiO2/Fe, modified with the anionic surfactant sodium dodecylsulfate (DS) were successfully synthesized in this work. Titanium dioxide (anatase) followed by iron oxide were deposited on the hydrotalcite support. Several catalyst samples were prepared with different amounts of titanium and iron. The photocatalysts were characterized by infrared and Raman spectroscopy, X-ray diffraction, scanning electron microscopy. Photocatalytic performance was analyzed by UV-visible radiation (filter cutoff, λ > 300 nm) of an aqueous solution (24 mg/L) of methylene blue (MB). The most efficient catalyst was obtained at an iron oxide:TiO2 molar ratio of 2:3. This catalyst showed high photocatalytic activity, removing 96% of the color and 61% of total organic carbon from the MB solution after 120 min. It was easily removed from solution after use because of its magnetic properties. The reuse of the HT-DS/TiO2/Fe23 catalyst was viable and the catalyst was structurally stable for at least four consecutive photocatalytic cycles.
authors.affiliation: Departamento de Química, Universidade Federal de Viçosa, Av. PH Holfs, s/n, 36571-000 Viçosa, Minas Gerais, Brazil.
authors.forename: Liany D L
authors.initials: LD
authors.lastname: Miranda
authors.affiliation: Departamento de Química, Universidade Federal de Viçosa, Av. PH Holfs, s/n, 36571-000 Viçosa, Minas Gerais, Brazil. Electronic address: bellato@ufv.br.
authors.forename: Carlos R
authors.initials: CR
authors.lastname: Bellato
authors.affiliation: Departamento de Química, Universidade Federal de Viçosa, Av. PH Holfs, s/n, 36571-000 Viçosa, Minas Gerais, Brazil.
authors.forename: Jaderson L
authors.initials: JL
authors.lastname: Milagres
authors.affiliation: Departamento de Física, Universidade Federal de Viçosa, Av. PH Holfs, s/n, 36571-000 Viçosa, Minas Gerais, Brazil.
authors.forename: Luciano G
authors.initials: LG
authors.lastname: Moura
authors.affiliation: Departamento de Engenharia Civil, Universidade Federal de Viçosa, Av. PH Holfs, s/n, 36571-000 Viçosa, Minas Gerais, Brazil.
authors.forename: Ann H
authors.initials: AH
authors.lastname: Mounteer
authors.affiliation: Departamento de Química, Universidade Federal de Viçosa, Av. PH Holfs, s/n, 36571-000 Viçosa, Minas Gerais, Brazil.
authors.forename: Marciano F
authors.initials: MF
authors.lastname: de Almeida
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D002384:Catalysis; D005290:Ferric Compounds / Q000737:chemistry*; D008276:Magnesium Hydroxide / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010777:Photochemistry / Q000379:methods; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D013501:Surface-Active Agents; C009495:titanium dioxide; C010467:hydrotalcite; C000499:ferric oxide; D012967:Sodium Dodecyl Sulfate; D000536:Aluminum Hydroxide; D014025:Titanium; C028913:dodecyl sulfate; D008276:Magnesium Hydroxide; D008751:Methylene Blue
keywords: Adsorption; Layered double hydroxides; Photocatalysis; TiO(2)