Cu also defected the TiO2 lattice by producing Ti3+ ions, which can increase the electron-hole separation
capacity of the photocatalyst, thereby increasing photocatalytic capacity. The optimal Cu content
in Cu/TiO2 to enhance the photocatalytic activity of TiO2 was 5 wt.%. Among three humidity conditions
(dry (40
±
5%), moderate (60
±
5%) and humid (80
±
5%)), the moderate condition showed the highest
disinfection efficiency of E. coli. When the 5% Cu-TiO2/GF was used under a moderate level of humidity,
the highest disinfection efficiency and disinfection capacity of E. coli were identified as 87.8% and 23
CFU/s cm2, respectively