Abstract
Nanocrystalline F-dopedTiO2powders were prepared by sol-gel route. The thermal behavior of the powders was recorded by DTA/TG technique. The crystalline phase of the fluorinatedTiO2powders was determined by X-ray diffraction technique. It was demonstrated that F-doping usingCF3COOH favors the formation of rutile along with anatase phase even at low temperature. Moreover, the rutile's phase content increases with the increase of the quantity of the fluorine precursor in the starting solution. The surface area of the powders and the pore size distribution were studied byN2adsorption-desorption using BET and BJH methods. X-ray photoelectron spectroscopy (XPS) revealed that the fluorine is presented in theTiO2powders mainly as metal fluoride in quantities∼16 at %. The F-dopedTiO2showed a red-shift absorption in UV-vis region which was attributed to the increased content of rutile phase in the powders. The powders exhibited enhanced photocatalytic activity in decomposition of acetone.
Highlights
In the last decades, the TiO2 is regarded as a promising material for organic pollutants remediation due to its properties [1]
We study the influence of CF3COOH fluorine precursor on the structure and the properties of TiO2 powders
It was found that the anatase/rutile crystalline ratio depends on the amount of fluorine precursor used for fluorination as well as on the temperature of thermal treatment
Summary
The TiO2 is regarded as a promising material for organic pollutants remediation due to its properties [1]. Narrowing of the band gap of TiO2 upon doping was often considered responsible for the enhanced visible light activity of these materials. The enhanced photocatalytic activity of F-doped powders has been attributed by. Yu et al [14] reported fluorine ions incorporation in the TiO2 lattice using an NH4F source They attributed the stronger absorption in the UV-visible range to the presence of the F− ions that favor anatase phase formation and improve the crystallinity of TiO2. Our recent study on fluorine-modified titania films [18] revealed improved anatase crystallinity upon fluorine doping without the effective band gap of TiO2 to be affected. Klein et al [22] produced rutile (100%) titania powders at low temperature using nitric and hydrochloric acids as catalysts. We study the influence of CF3COOH fluorine precursor on the structure and the properties of TiO2 powders
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