Antibacterial Activity of Hydrophobic Composite Materials Containing a Visible-Light-Sensitive Photocatalyst

Table 2

Adhesion of E. coli onto the PTFE hydrophobic composite films with and without the addition of N-doped TiO₂ (NT).

Visible-light illuminating time (h)	Viable E. coli count/cells
	Control	8% NT (Visible Light) 2000 Lx	8% NT (Dark)
0	1⋅𝐸+03	1⋅𝐸+02	NT
8	1⋅𝐸+03	1⋅𝐸+01	NT
24	1⋅𝐸+05	0⋅𝐸+00	1⋅𝐸+05

By rinsing the samples with nutrient broth solution containing 10⁸ CFU/mL of E. coli for 10 sec, 10³ E. coli cells were adsorbed on the surface of PTFE hydrophobic composite films. The viable E. coli were all inactivated with visible-light illumination at 2000 lx for 24 hours.