Abstract
Irradiation source has been a serious impediment to induce photocatalytic bacterial inactivation which was taken as an advanced indoor air purification technique. Here we reported the synergistic effects of 405 nm LED light and TiO2photocatalyst in inactivation process ofStaphylococcus aureus(S. aureus). In this work, TiO2and N-doped TiO2particles were, respectively, suspended into the nutrient broth suspension withS. aureus. Then, the mixed system was exposed to a 405 nm LED light source with energy density of about 0.2 W/cm2for 3 hours. Irradiated suspension was then scanned by UV-vis spectrophotometer for bacteria survive/death rate statistics. Subsequently, the inactivation efficiency was calculated based on the difference of the absorption optical density between experimental and controlled suspensions. Results showed that both TiO2and N-doped TiO2particles exhibit potential bacterial inactivation effects under similar experimental conditions. Specifically, N-doped TiO2with the concentration of 5 g/L displayed enhanced inactivation efficiency againstS. aureusunder 405 nm LED light irradiation. Thus, it is a promising indoor air purification technique by using N-doped TiO2particles under the LED light irradiation.
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