Inactivation of Salmonella typhi Using Fe3+ Doped TiO2/3SnO2 Photocatalytic Powders and Films
The aim of the present study is to synthesize Fe3+-doped TiO2/3SnO2 powder and evaluate its antibacterial performance coated on polyvinylchloride films for fresh food packaging. Fe3+-doped TiO2/3SnO2 nanoparticles were prepared as a photocatalyst through the sol-gel method with concentrations of 0.3-1.2 mol% and a calcination temperature of 400°C. It was found that calcination temperatures strongly affect the phases and phase transformation of TiO2. According to XRD analysis, the anatase crystalline was formed at the calcination temperature of 400°C. In the present work, the photocatalytic performance was determined through methylene blue degradation. The antibacterial activity against Salmonella typhi was investigated with a vitro test, from which the mixture of conidial suspension and Fe3+-doped TiO2/3SnO2 powder was added to Nutrient agar (NA) plates under UV and visible light irradiation, respectively. It was found that Fe3+-doped TiO2/3SnO2 nanoparticles enhance photocatalytic activity and bacterial inactivation efficiency. In addition, Fe3+-doped TiO2/3SnO2 thin films can destroy the cell walls of bacteria within 240 min. Furthermore, the disinfection efficiency of TiO2/3SnO2/0.5 Fe3+ is greater under UV irradiation than it is under visible light.
L. Sikong et al., "Inactivation of Salmonella typhi Using Fe3+ Doped TiO2/3SnO2 Photocatalytic Powders and Films", Journal of Nano Research, Vol. 12, pp. 89-97, 2010