The effects of the bacterial interaction with visible-light responsive titania photocatalyst on the bactericidal performance.
Bactericidal activity of traditional titanium dioxide (TiO2) photocatalyst is effective only upon irradiation by ultraviolet light, which restricts the potential applications of TiO2 for use in our living environments. Recently carbon-containing TiO2 was found to be photoactive at visible-light illumination that affords the potential to overcome this problem; although, the bactericidal activity of these photocatalysts is relatively lower than conventional disinfectants. Evidenced from scanning electron microscopy and confocal Raman spectral mapping analysis, we found the interaction with bacteria was significantly enhanced in these anatase/rutile mixed-phase carbon-containing TiO2. Bacteria-killing experiments indicate that a significantly higher proportion of all tested pathogens including Staphylococcus aureus, Shigella flexneri and Acinetobacter baumannii, were eliminated by the new nanoparticle with higher bacterial interaction property. These findings suggest the created materials with high bacterial interaction ability might be a useful strategy to improve the antimicrobial activity of visible-light-activated TiO2.
Cheng
Chia-Liang
CL
Department of Physics, National Dong-Hwa University, Hualien, Taiwan. clcheng@mail.ndhu.edu.tw
Sun
Der-Shan
DS
Chu
Wen-Chen
WC
Tseng
Yao-Hsuan
YH
Ho
Han-Chen
HC
Wang
Jia-Bin
JB
Chung
Pei-Hua
PH
Chen
Jiann-Hwa
JH
Tsai
Pei-Jane
PJ
Lin
Nien-Tsung
NT
Yu
Mei-Shiuan
MS
Chang
Hsin-Hou
HH
D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000472:pathogenicity; D002384:Catalysis; D024881:Drug Resistance, Bacterial; D006801:Humans; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry; D008826:Microbial Sensitivity Tests; D010777:Photochemistry; D013059:Spectrum Analysis, Raman; D014025:Titanium / Q000737:chemistry / Q000494:pharmacology*
D000900:Anti-Bacterial Agents; C009495:titanium dioxide; D014025:Titanium