title: Photocatalytic degradation of an azo dye using N-doped NaTaO3 synthesized by one-step hydrothermal process.
abstract: N-doped NaTaO(3) compounds (NaTaO(3-)(x)N(x)) with nano-cubic morphology were successfully synthesized by one-step hydrothermal method and Methyl Orange (MO) was used as a model dye to evaluate their photocatalytic efficiency under visible-light irradiation. The as-prepared NaTaO(3-)(x)N(x) samples were characterized by various techniques, such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and UV-vis diffuse reflectance spectra and GC-MS. The results indicate that NaTaO(3-)(x)N(x) displays a pure perovskite structure when the synthesis temperature is higher than 180°C. Moreover, as observed by SEM images, the particles of resultant NaTaO(3-)(x)N(x) show cubic morphology with the edge length of 200-500nm, which can be easily removed by filtration after photocatalytic reaction. Doping of N increases the photocatalytic activity of NaTaO(3), and NaTaO(2.953)N(0.047) shows the highest visible-light photocatalytic activity for the degradation of MO. Based on the experiment results, a possible mechanism of the photocatalysis over NaTaO(3-)(x)N(x) and the photodegradation pathway of MO were proposed.
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, and Department of Materials Science and Engineering, Jilin University, 5988 People's Avenue, Changchun 130025, PR China.
authors.forename: Da-Rui
authors.initials: DR
authors.lastname: Liu
authors.forename: Yin-Shan
authors.initials: YS
authors.lastname: Jiang
authors.forename: Gui-Mei
authors.initials: GM
authors.lastname: Gao
mesh_terms: D001391:Azo Compounds / Q000032:analysis / Q000737:chemistry*; D006361:Heating; D009584:Nitrogen / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D055668:Photochemical Processes; D012666:Semiconductors; D013635:Tantalum / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D010087:Oxides; D014874:Water Pollutants, Chemical; C404416:sodium tantalate; D013635:Tantalum; D009584:Nitrogen