3.2.1. Effect of silver-doped TiO2
Fig. 7 shows the enhanced photocatalytic activity of the Ag–TiO2 films compared with that of the normal TiO2 films. The data show that the concentrations of nitrate decreased from 7.14 to 3.87 mM in the TiO2 system and from 7.14 to 1.83 mM in the Ag–TiO2 system, equivalent to the removal efficiency of 45.8% and 74.4%, respectively. However, the concentrations of nitrate slightly decreased from 7.14 to 6.82 mM in the system of uncoated stainless steel sheets, equivalent to a mere 4.4% reduction. Therefore, the net removal of nitrate of the thin films was 41.4% and 70.0%, for TiO2 and 0.1% Ag–TiO2, respectively. The calculations of the reaction kinetics as a function of photon fluence according to the method described by Doudrick et al. [6] showed that the reaction rate constants were 0.14 cm2/photons × 1014 for TiO2 thin films and 0.33 cm2/photons × 1014 for the 0.1% Ag–TiO2 thin films (Table 2).
3.2.1. Effect of silver-doped TiO2Fig. 7 shows the enhanced photocatalytic activity of the Ag–TiO2 films compared with that of the normal TiO2 films. The data show that the concentrations of nitrate decreased from 7.14 to 3.87 mM in the TiO2 system and from 7.14 to 1.83 mM in the Ag–TiO2 system, equivalent to the removal efficiency of 45.8% and 74.4%, respectively. However, the concentrations of nitrate slightly decreased from 7.14 to 6.82 mM in the system of uncoated stainless steel sheets, equivalent to a mere 4.4% reduction. Therefore, the net removal of nitrate of the thin films was 41.4% and 70.0%, for TiO2 and 0.1% Ag–TiO2, respectively. The calculations of the reaction kinetics as a function of photon fluence according to the method described by Doudrick et al. [6] showed that the reaction rate constants were 0.14 cm2/photons × 1014 for TiO2 thin films and 0.33 cm2/photons × 1014 for the 0.1% Ag–TiO2 thin films (Table 2).
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