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

✍ Scribed by Xiaohui Huang; Huaibing Wang; Song Yin; Xiaorong Chen; Wei Chen; Hui Yang

• Book ID: 102315397
• Publisher: Wiley (John Wiley & Sons)
• Year: 2009
• Tongue: English
• Weight: 189 KB
• Volume: 84
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.2180

✦ Synopsis

Abstract

BACKGROUND: Ultraviolet light emitting diodes (UV LEDs) were used as a light source in TiO~2~ photocatalysis because of their many advantages, such as, long life, safety, low pollution, etc. In this experiment, a light source panel was successfully fabricated with UV LEDs, the light intensities of which were relatively uniform.

RESULTS: The sterilization process comprised two steps. First, an aerosol was blocked by high efficient particulate air (HEPA) filter paper coated with TiO~2~ photocatalyst. Second, Staphylococcus aureus in the aerosol decreased gradually in the photocatalysis process of UV LED/TiO~2~. 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/TiO~2~ for photocatalysis was proved. Copyright © 2009 Society of Chemical Industry