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Environ Sci Technol. 2005 Feb 15;39(4):1175-9.

Efficient visible-light-induced photocatalytic disinfection on sulfur-doped nanocrystalline titania.

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  • 1Departments of Chemistry and Biology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China. jimyu@cuhk.edu.hk


Sulfur-doped titanium dioxide exhibits a strong visible-light-induced antibacterial effect. The new photocatalyst can effectively kill Micrococcus lylae, a common Gram-positive bacterium. The relationship between sulfur concentration and the bactericidal activity of S-doped TiO2 was investigated. Results from DMPO spin-trapping electron spin resonance measurements confirm the formation of hydroxyl radicals, which is the origin of the considerable bactericidal activity under visible light irradiation.

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