Wet chemical synthesis and photocatalytic activity of potassium niobate K6Nb10.8O30 powders
| Autor: | Yanjun Hu, Xinmiao Ding, Junwei Xie, Gaoke Zhang, Jin Zhou |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Potassium niobate
Chemistry Band gap Scanning electron microscope Inorganic chemistry Niobium Analytical chemistry chemistry.chemical_element Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Field emission microscopy chemistry.chemical_compound X-ray photoelectron spectroscopy X-ray crystallography Materials Chemistry Ceramics and Composites Photocatalysis Physical and Theoretical Chemistry |
| Zdroj: | Journal of Solid State Chemistry. 181:2133-2138 |
| ISSN: | 0022-4596 |
| Popis: | The nanometer potassium niobate powders with tungsten bronze (TB)-type structure were synthesized by a wet chemical method and characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). X-ray photoelectron spectroscopy (XPS) analysis confirmed the niobium with mixed valence states exists in the crystal structure of the photocatalyst, which may be advantage for increasing the photocatalytic activity. The band gap of K{sub 6}Nb{sub 10.8}O{sub 30} powders was estimated to be about 2.92 eV and shows a markedly blue-shift as compared to that of the sample obtained by the solid-state reaction. The photocatalytic activity of the samples was evaluated by degradation of acid red G under UV irradiation and the photocatalytic reaction follows first-order kinetics. The photocatalytic activity of the as-prepared sample is much higher than that of sample synthesized by solid-state reaction, and slightly higher than that of P25-TiO{sub 2}. - Graphical abstract: The K{sub 6}Nb{sub 10.8}O{sub 30} powders with TB-type structure were synthesized by a wet chemical method at lower temperature. The particle size of the as-prepared powders is much smaller than that of the sample by obtained solid-state method and its photocatalytic activity is much higher than that of the latter and slightly higher than thatmore » of P25-TiO{sub 2}.« less |
| Databáze: | OpenAIRE |
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