Abstract
In the present study,we investigated the influence of surface fluorine(F)on TiO2 for the photocatalytic oxidation(PCO)of toluene.Ti02 modified with different F content was pre-pared and tested.It was found that with the increasing of F content,the toluene conversion rate first increased and then decreased.However,CO2 mineralization efficiency showed the opposite trend.Based on the characterizations,we revealed that F substitutes the surface hy-droxyl of TiO2 to form the structure of ≡Ti-F.The presence of the appropriate amount of sur-face ≡Ti-F on TiO2 greatly enhanced the separation of photogenerated carriers,which facil-itated the generation of·OH and promoted the activity for the PCO of toluene.It was further revealed that the increase of only OH promoted the conversion of toluene to ring-containing intermediates,causing the accumulation of intermediates and then conversely inhibited the·OH generation,which led to the decrease of the CO2 mineralization efficiency.The above results could provide guidance for the rational design of photocatalysts for toluene oxida-tion.
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