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Enhancement of Photocatalytic Activity of Mesporous TiO2 Powders by Hydrothermal Surface Fluorination Treatment
Abstract
Mesporous surface-fluorinated TiO 2 (F−TiO 2 ) powders of anatase phase with high photocatalytic activity are prepared by a one-step hydrothermal strategy in a NH 4 HF 2 −H 2 O−C 2 H 5 OH mixed solution with tetrabutylorthotitanate (Ti(OC 4 H 9 ) 4, TBOT) as precursor. The prepared samples are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, N 2 adsorption−desorption isotherms, UV−vis absorption spectroscopy, and transmission electron microscopy. The production of hydroxyl radicals ( • OH) on the surface of UV-illuminated TiO 2 is detected by a photoluminescence (PL) technique with use of terephthalic acid as a probe molecule. The photocatalytic activity is evaluated by photocatalytic oxidation decomposition of acetone in air under UV light illumination. The results show that the photocatalytic activity of F−TiO 2 powders is obviously higher than that of pure TiO 2 and commercial Degussa P25 (P25) powders due to the fact that the strong electron-withdrawing ability of the surface ≡Ti−F groups reduces the recombination of photogenerated electrons and holes, and enhances the formation of free OH radicals. Especially, the F−TiO 2 powder prepared at the nominal atomic ratio of fluorine to titanium ( R F ) of 0.5 shows the highest photocatalytic activity and its rate constant k exceeds that of P25 by a factor of more than 3 times.
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Metadata
- Authors
- Yu, J., Wang, W., Cheng, B., & Su, B.-L.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-03-31
- Volume
- 113
- Issue
- 16
- Pages
- 6743-6750
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2053360713
- Cited by
- 611
- References
- 3
- FWCI
- 23.07
- Type
- journal article
- Language
- en
- Open access
- closed
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