Visible-light-induced bactericidal activity of a nitrogen-doped titanium photocatalyst against human pathogens

Ming Show Wong, Wen Chen Chu, Der Shan Sun, Hsuan Shun Huang, Jiann Hwa Chen, Pei Jane Tsai, Nien Tsung Lin, Mei Shiuan Yu, Shang Feng Hsu, Shih Lien Wang, Hsin Hou Chang

研究成果: Article同行評審

183 引文 斯高帕斯(Scopus)


The antibacterial activity of photocatalytic titanium dioxide (TiO 2) substrates is induced primarily by UV light irradiation. Recently, nitrogen- and carbon-doped TiO2 substrates were shown to exhibit photocatalytic activities under visible-light illumination. Their antibacterial activity, however, remains to be quantified. In this study, we demonstrated that nitrogen-doped TiO2 substrates have superior visible-light-induced bactericidal activity against Escherichia coli compared to pure TiO2 and carbon-doped TiO2 substrates. We also found that protein- and light-absorbing contaminants partially reduce the bactericidal activity of nitrogen-doped TiO2 substrates due to their light-shielding effects. In the pathogen-killing experiment, a significantly higher proportion of all tested pathogens, including Shigella flexneri, Listeria monocytogenes, Vibrio parahaemolyticus, Staphylococcus aureus, Streptococcus pyogenes, and Acinetobacter baumannii, were killed by visible-light-illuminated nitrogen-doped TiO2 substrates than by pure TiO2 substrates. These findings suggest that nitrogen-doped TiO2 has potential application in the development of alternative disinfectants for environmental and medical usages.

頁(從 - 到)6111-6116
期刊Applied and environmental microbiology
出版狀態Published - 2006 九月

All Science Journal Classification (ASJC) codes

  • 生物技術
  • 食品科學
  • 應用微生物與生物技術
  • 生態學


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