Sterilization system for air purifier by combining ultraviolet light emitting diodes with TiO2

摘要

BACKGROUND: Ultraviolet light emitting diodes (UV LEDs) were used as a light source in TiO2 photocatalysis because of their manyadvantages, such as, long life, safety, lowpollution, etc. In this experiment, a light source panelwas successfully fabricated with UV LEDs, the light intensities of which were relatively uniform. RESULTS:Thesterilizationprocesscomprisedtwosteps.First,anaerosolwasblockedbyhigh efficient particulateair(HEPA)filter paper coated with TiO2 photocatalyst. Second, Staphylococcus aureus in the aerosol decreased gradually in the photocatalysis process of UV LED/TiO2. After 52 h irradiation all the S. aureus were killed. CONCLUSION: The UV LED light source panel had a larger surface for irradiation than a mercury lamp. Thus, its sterilization efficiency was much better than that of traditional methods. The feasibility of UV LED/TiO2 for photocatalysis was proved.