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Surface Acidity and Fluorine-Doping

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In the attached paper, the authors claim that F-doping enhanced surface acidity. Why does the presence of fluorine increase surface acidity?

Reference:
Li, D., Haneda, H., Hishita, S., Ohashi, N., & Labhsetwar, N. K. (2005). Fluorine-doped TiO< sub> 2</sub> powders prepared by spray pyrolysis and their improved photocatalytic activity for decomposition of gas-phase acetaldehyde. Journal of Fluorine Chemistry, 126(1), 69-77.

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Surface Acidity and Fluorine
In the attached paper, the authors claim that F-doping enhanced surface acidity. Why does the presence of fluorine increase surface acidity?

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Fluorine incorporation into TiO2 causes replacement of surface or lattice O and OH groups by F, which increases the acidity of Bronsted and Lewis acid sites on the surface, due to stronger electronegativity and polarizing effect of fluorine [1]. By ...

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