is dependent on the Cu loading amount in the photocatalyst.
The visible light adsorption of Cu-TiO2/GF increased with
increasing Cu content up to 5% and then began to drop when Cu
content was 7.5%. When the Cu content in Cu-TiO2/GF increased,
the CuO content also increased. This is because the CuO content
is produced in proportion to Cu content in Cu-TiO2/GF photocatalysts
(as also explained in the XRD results). CuO acts as an
intermediate agent for the transfer of photo-generated electrons
from the valence band to the conduction band of TiO2, leading
to increased visible light absorption of Cu-TiO2/GF photocatalysts.
Therefore, visible light absorption of Cu-TiO2/GF increased with
increasing Cu content. However, at high Cu content, such as 7.5
and 10% of Cu in Cu-TiO2/GF, Cu strongly defects into the TiO2
lattice resulting in too many oxygen vacancies in the TiO2 lattice.
This was also observed in the XPS analysis. Oxygen vacancies act as
is dependent on the Cu loading amount in the photocatalyst.The visible light adsorption of Cu-TiO2/GF increased withincreasing Cu content up to 5% and then began to drop when Cucontent was 7.5%. When the Cu content in Cu-TiO2/GF increased,the CuO content also increased. This is because the CuO contentis produced in proportion to Cu content in Cu-TiO2/GF photocatalysts(as also explained in the XRD results). CuO acts as anintermediate agent for the transfer of photo-generated electronsfrom the valence band to the conduction band of TiO2, leadingto increased visible light absorption of Cu-TiO2/GF photocatalysts.Therefore, visible light absorption of Cu-TiO2/GF increased withincreasing Cu content. However, at high Cu content, such as 7.5and 10% of Cu in Cu-TiO2/GF, Cu strongly defects into the TiO2lattice resulting in too many oxygen vacancies in the TiO2 lattice.This was also observed in the XPS analysis. Oxygen vacancies act as
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