Photocatalytic inactivation of E. coli with a mesoporous TiO2 coated film using the film adhesion method.
The photocatalytic inactivation of Escherichia coli with the film adhesion method by using Degussa P25TiO2 and mesoporous TiO2 coated on glass was investigated. Monodisperse spherical mesoporous TiO2 with a morphology size of approximately 800 nm was synthesized via the sol-gel approach and coated onto glass substrates without cracking by using the doctor blade method with various amounts of polyethylene oxide (PEO) and polyethylene glycol (PEG). Photocatalytic disinfection was tested by varying the UV-A light intensity, cell concentration, and UV-A irradiation time. The photocatalytic inactivation achieved with mesoporous TiO2 was found to be higher than that with the commercial P25TiO2. Byvarying the surface area and crystallite size of mesoporous TiO2 through control of the calcination temperature, we found that the efficacy of photocatalytic disinfection with the film adhesion method is strongly dependent on the surface area and crystallite size: the larger the surface area and the smaller the crystallites, the higher the efficacy of photocatalytic inactivation.
Kim
Dong Suk
DS
Department of Materials Science and Engineering, Seoul National University, 599 Gwanangno, Gwanak-ku, Seoul 151-744, Korea.
Kwak
Seung-Yeop
SY
D001422:Bacterial Adhesion / Q000528:radiation effects; D018441:Biofilms / Q000528:radiation effects; D002384:Catalysis / Q000528:radiation effects; D004203:Disinfection; D004926:Escherichia coli / Q000166:cytology* / Q000502:physiology* / Q000528:radiation effects; D050296:Microbial Viability / Q000528:radiation effects; D008855:Microscopy, Electron, Scanning; D010777:Photochemistry / Q000379:methods*; D016062:Porosity / Q000528:radiation effects; D013997:Time Factors; D014025:Titanium / Q000378:metabolism*; D014466:Ultraviolet Rays
C009495:titanium dioxide; D014025:Titanium