title: Preparation of Fe3+-doped TiO2 catalysts by controlled hydrolysis of titanium alkoxide and study on their photocatalytic activity for methyl orange degradation.
abstract: Fe3+-doped TiO2 (Fe-TiO2) porous microspheres were prepared by controlled hydrolysis of Ti(OC4H9)4 with water generated "in situ" via an esterification reaction between acetic acid and ethanol, followed by hydrothermal treatment. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic absorption flame emission spectroscopy (AAS), electron paramagnetic resonance (EPR) spectrum, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), and nitrogen adsorption-desorption methods. All of the undoped TiO2 and Fe-TiO2 samples exclusively consist of primary anatase crystallites, which further form porous microspheres with diameters ranging from 150 to 500 nm. The photocatalytic activity of Fe-TiO2 catalysts was evaluated from the photodegradation of methyl orange (MO) aqueous solution both under UV and visible light irradiation. Fe3+ doping effectively improves the photocatalytic activity under both UV light irradiation and visible light irradiation with an optimal doping concentration of 0.1 and 0.2%, respectively. The photocatalytic mechanisms of Fe-TiO2 catalysts were tentatively discussed.
authors.affiliation: Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, PR China.
authors.forename: Tianzhong
authors.initials: T
authors.lastname: Tong
authors.forename: Jinlong
authors.initials: J
authors.lastname: Zhang
authors.forename: Baozhu
authors.initials: B
authors.lastname: Tian
authors.forename: Feng
authors.initials: F
authors.lastname: Chen
authors.forename: Dannong
authors.initials: D
authors.lastname: He
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D004578:Electron Spin Resonance Spectroscopy; D005290:Ferric Compounds / Q000737:chemistry*; D006868:Hydrolysis; D046529:Microscopy, Electron, Transmission; D009584:Nitrogen / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D001391:Azo Compounds; D005290:Ferric Compounds; C009495:titanium dioxide; C100258:methyl orange; D014025:Titanium; D009584:Nitrogen