Photocatalytic Activity of TiO2 Modified with Hexafluorometallates-Fine Tuning of Redox Properties by Redox-Innocent Anions

A group of selected hexafluorometallates ([AlF6](3), [TiF6](2), [ZrF6](2), and [SiF6](2)) has been adsorbed at the surface of titanium dioxide. Such modification influenced the electronic and chemical properties of TiO2, as well as its photoactivity. The modification with [TiF6](2) inhibited the efficiency of OH production but enhanced the generation of photocurrent and singlet oxygen. The results of modifications with [ZrF6](2) were the oppositegeneration of 1O(2) was not observed in this case and photocurrents were lower; however, due to a better OH production, degradation of herbicides was faster.