Preparation and characterization of TiO2 photocatalysts co-doped with iron (III) and lanthanum for the degradation of organic pollutants |
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Authors: | Qiangqiang WangShihua Xu Fenglei Shen |
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Affiliation: | College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China |
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Abstract: | Titanium dioxide photocatalysts co-doped with iron (III) and lanthanum were prepared by a facile sol-gel method. The structure of catalysts was characterized by X-ray diffraction (XRD), Raman spectroscopy, UV-vis diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy (XPS). The photocatalytic activities of the samples were evaluated by the degradation of methylene blue in aqueous solutions under visible light (λ > 420 nm) and UV light irradiation. Doping with Fe3+ results in a lower anatase to rutile (A-R) phase transformation temperature for TiO2 particles, while doping with La3+ inhibits the A-R phase transformation, and co-doping samples indicate that Fe3+ partly counteracts the effect of La3+ on the A-R transformation property of TiO2. Fe-TiO2 has a long tail extending up the absorption edges to 600 nm, whereas La-TiO2 results in a red shift of the absorption. However, Fe and La have synergistic effect in the absorption of TiO2. Compared with Fe3+ and La3+ singly doped TiO2, the co-doped simple exhibits excellent visible light and UV light activity and the synergistic effect of Fe3+ and La3+ is responsible for improving the photocatalytic activity. |
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Keywords: | Titania Fe3+ doped La3+ doped Co-doped Photocatalysts Synergistic effect |
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