Phosphate and silver co-functionalized TiO2 catalysts were prepared by varying amount of silver (0-1 wt.%) with constant phosphate content (0.25 wt.%). Two methods, the well-know photodeposition and a new simple method, i.e. heterocoagulation, are presented for preparing Ag-TiO2 and the optical, photochemical and photobiological properties of the different samples have been compared. Due to the silver modification, the photocatalysts showed a new Plasmon resonance peak at λmax=455 nm. The photocatalytic efficiencies of the new photocatalysts were studied under UV-A/visible (λ≥ 360 nm) irradiation. Mechanically stable hydrophilic poly(EA-co-MMA) and hydrophobic poly(Bi.A-co-Ech.) based composite films were prepared by spray coating technique. The photocatalytic efficiencies decreased only by ∼ 15% on the hydrophilic and ∼ 63% on the hydrophobic polymer compared to the reference pure photocatalyst films. The antibacterial activity of the films was also studied under visible light (λ≥ 400 nm) irradiation. Methicillin resistant Staphylococcus aureus (MRSA) was used as test bacterium. The best antibacterial activity (90% of bacteria destruction in 15 minutes) could be observed on the Ag-TiO2/p(EA-co-MMA) film.
- Titanium dioxide
ASJC Scopus subject areas
- Physical and Theoretical Chemistry