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A visible-light response vanadium-doped titania nanocatalyst by sol – gel method
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wu, Jeffrey C.-S. Chen, Chih-Hsien |
| Copyright Year | 2004 |
| Abstract | A series of vanadium-doped TiO 2 catalysts were synthesized by two modified sol–gel methods. V-doped TiO 2 was found to be mainly preserved its anatase phase after calcination at 400 ◦C. The TEM micrographs showed the sizes of primary particles were in the range of 6–20 nm. The increase of vanadium doping promoted the particle growth, and enhanced “red-shift” in the UV-Vis absorption spectra. The XPS (X-ray photoelectron spectroscopy) could not detect vanadium indicating negligible vanadium on the surface of catalysts, furthermore, there were also no peak of vanadium oxide in the XRD patterns. XAS (X-ray absorption spectroscopy) analysis indicating V 4+ instead of V5+ implied that vanadium either substituted Ti 4+ site or embedded in the vacancy of TiO 2 structure. Therefore, vanadium was concluded to be highly dispersed inside the TiO 2 structure. The photocatalytic activity was evaluated by the degradation of crystal violet (CV) and methylene blue (MB) under visible light irradiation. The degradation rate of CV and MB on V-doped TiO 2 were higher than those of pure TiO2. As the results, V-doped TiO 2 possessed better absorption ability of visible light. © 2004 Elsevier B.V. All rights reserved. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://ntur.lib.ntu.edu.tw//bitstream/246246/93148/1/17.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Bands Biologic Preservation Diagnostic radiologic examination Digraphs and trigraphs Doping (semiconductor) Doping in Sports Elegant degradation Embedded system Embedding Gentian Violet Guilty Gear Xrd H Lee Moffitt Cancer Center and Research Institute Ions Leukemoid Reaction Light, Visible Liquid-crystal display Methylene blue Paphia undulata Photoelectric effect Redshift Sol-gel Synchrotrons Titania Titanium Vanadium 5+ Viola |
| Content Type | Text |
| Resource Type | Article |
