Photocatalytic Disinfection of Indoor Air

[+] Author and Article Information
D. Y. Goswami

Solar Energy and Energy Conversion Laboratory, Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611

D. M. Trivedi, S. S. Block

Department of Chemical Engineering, University of Florida, Gainesville, FL 32611

J. Sol. Energy Eng 119(1), 92-96 (Feb 01, 1997) (5 pages) doi:10.1115/1.2871871 History: Received June 01, 1995; Revised December 01, 1995; Online February 14, 2008


The present study demonstrated the antibacterial effect of photocatalytic oxidation in indoor air using titanium dioxide as the catalyst. Through a series of experiments, it was determined that titanium dioxide did enhance the inactivation rate of the microorganisms under certain conditions. In these experiments the air velocity, relative humidity, and UV (350 nm) intensity were varied. It was found that higher velocities retarded the destruction rate due to the low retention time in the reactor. TiO2 also did not accelerate the reaction at low humidities (30 percent). At a relative humidity of 50 percent, there was complete inactivation of the organisms, but at higher humidities (85 percent), 10 percent of the organisms were still viable. The experiments showed that at higher UV intensities, most of the inactivation was done by the UV photons. However, the photons were not able to completely inactivate the microorganisms. In the photocatalysis experiments there was complete inactivation of the bacteria.

Copyright © 1997 by The American Society of Mechanical Engineers
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