AI Article Synopsis
- The study investigates how surface fluorination of TiO2 affects the photocatalytic degradation of the azo dye, Orange G, under UV and visible light.
- The research reveals that while fluorination hinders the dye's adsorption on TiO2, it significantly enhances the rate of degradation under UV light by producing more free hydroxyl radicals.
- In systems using visible light, fluorination has an inhibitory effect due to competitive adsorption, indicating its influence on the photodegradation of dye pollutants.
Article Abstract
For TiO2 heterogeneous reaction, the reaction site and the detailed mechanism are interesting and controversy topics. In this paper, effects of surface fluorination of TiO2 on the photocatalytic degradation of an azo dye, Orange G(OG) under UV or visible light irradiation were investigated, and the possible reaction site and mechanism were elucidated. The adsorption of OG on TiO2 was nearly inhibited by fluoride but its UV light induced photodegradation rate was greatly increased by a factor of about 2.7, which was due to the more generated free hydroxyl radicals. It supported the views that fluoride could desorb the oxidant species from surface and that the reaction sites could move to the bulk solution. In TiO2/Vis system, the observed inhibition effects of fluorination could be interpreted by the competitive adsorption, which provided additional evidences that the visible light sensitized photodegradation of dye pollutants on the catalyst surface.
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