Chitosan/TiO2 nanocomposites with different CS-TiO2 ratios were synthesized.
Chitosan/TiO2 nanocomposites exhibited better performance than the single one.
Chitosan/TiO2 nanocomposites showed antibacterial activity in both light and dark.
The improved effect may be due to the new properties of this nanocomposite.
EPS was involved in the antibacterial activity of chitosan/TiO2 nanocomposites.