Unusual photo-induced adsorption–desorption behavior of propylene on Ag/TiO2 nanotube under visible light irradiation
| Autor: | Caixia Feng, Rui Lang, Zhensheng Jin, Zhijun Zhang, Jingwei Zhang, Zhishen Wu |
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| Rok vydání: | 2011 |
| Předmět: |
Nanotube
Materials science Annealing (metallurgy) General Physics and Astronomy Surfaces and Interfaces General Chemistry Condensed Matter Physics Photochemistry Silver nanoparticle Surfaces Coatings and Films chemistry.chemical_compound Adsorption X-ray photoelectron spectroscopy chemistry Transmission electron microscopy Desorption Titanium dioxide |
| Zdroj: | Applied Surface Science. 257:1864-1870 |
| ISSN: | 0169-4332 |
| Popis: | Titanium dioxide (TiO 2 ) nanotube with a large amount of single-electron-trapped-oxygen-vacancies (coded as T2) was obtained by annealing nanotube H 2 Ti 2 O 4 (OH) 2 (coded as T1) at 400 °C in air. Silver nanoparticles with a diameter of about 30–50 nm were loaded onto the surface of T2 via deposition associated with photochemical reduction under ultraviolet irradiation. The resulting Ag/TiO 2 nanotube (coded as T3) was characterized by means of transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and ultraviolet–visible light diffusion reflectance spectrometry. It was found that C 3 H 6 experienced unusual photo-induced adsorption–desorption on T3 under visible light irradiation. Namely, C 3 H 6 was initially desorbed from T3 and then adsorbed on T3 under visible light irradiation. On the contrary, C 3 H 6 was initially adsorbed on T3 in the dark, followed by desorption. The reason might lie in that two kinds of active sites exist on the surface of T3, corresponding to quite different rates of adsorption and desorption. It was found that oxygen vacancies in association with deposited silver particles, were responsible for the alternative adsorption–desorption of C 3 H 6 on T3. |
| Databáze: | OpenAIRE |
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