Control of viruses in drinking water with visible light-activated TiON/PdO photocatalyst: performance dynamics associated with regeneration and activation
Kluge, Corinne N.
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https://hdl.handle.net/2142/16153
Description
Title
Control of viruses in drinking water with visible light-activated TiON/PdO photocatalyst: performance dynamics associated with regeneration and activation
Author(s)
Kluge, Corinne N.
Issue Date
2010-05-19T18:39:12Z
Director of Research (if dissertation) or Advisor (if thesis)
Mariñas, Benito J.
Department of Study
Civil & Environmental Eng
Discipline
Environ Engr in Civil Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Disinfection
Titanium dioxide (TiO2)
MS2 (bacteriophage)
photocatalyst
solar disinfection
Abstract
The need for cost-effective and socio-culturally accepted treatment of drinking water in areas without access to clean water has motivated exploration of alternative pathogen control strategies including point of use systems using solar disinfection. Photocatalytic materials, such as titanium dioxide, have been demonstrated to inactivate a variety of pathogens when irradiated with UVA light but the UVA fraction of sun light is limited. In this research, the performance of a visible light-activated palladium-modified, nitrogen-doped titanium oxide (TiON/PdO) photocatalyst against viruses was further characterized. For initial virus concentrations of 108-1011 pfu/ml, TiON/PdO, was able to achieve four-logs of viral surrogate MS2 phage removal, with both dark and photocatalytic effects. Sustained regeneration potential of the material was tested using ozonation, which has been shown to completely restore the removal capacity after repeated use without degradation. A “photocatalytic memory” effect previously seen with E.coli was further explored with MS2 phage. The sorptive affinity of the material for viruses, coupled with its potential to oxidize contaminants at its surface when illuminated by visible light, may provide a novel means to couple with solar disinfection to provide continuous and effective point of use treatment for areas in need.
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