An overall trend can be observed where E g decreases while the Cu concentration increases, which is in agreement with other results [ 45 , 56 , 57 ]. 2.1.3.
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Investigation of the Photocatalytic Activity of Copper-Modified Commercial Titania (P25) in the Process of Carbon Dioxide Photoreduction.
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Samples with a copper concentration above 6 wt.% (theoretical) show a slight trend of declining S BET values as the amount of copper present in the preparation of a sample is raised—that observation is similar to the other research reported in the literature [ 72 ].
That possibility, in return, lowers the chance of attributing a reliable trend to the changes observed in the data.