期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 5, 页码 1663-1672出版社
AMER CHEMICAL SOC
DOI: 10.1021/am302676a
关键词
titanium dioxide; microwave synthesis; carbon-doping; visible-light induced photocatalysis; antibacterial activity; heterojunctions
资金
- Enterprise Ireland [CFTD/06/IT/326, ARE/2008/0005]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1033317] Funding Source: National Science Foundation
Visible-light-induced antibacterial activity of carbon-doped anatase-brookite titania nano-heterojunction photocatalysts are reported for the first time. These heterostructures were prepared using a novel low temperature (100 degrees C) nonhydrothermal low power microwave (300 W) assisted method. Formation of interband C 2p states was found to be responsible for the band gap narrowing of the carbon doped heterojunctions. The most active photocatalyst obtained after 60 min of microwave irradiation exhibits a 2-fold higher visible-light induced photocatalytic activity in contrast to the standard commercial photocatalyst Evonik-Degussa P-25. Staphylococcus aureus inactivation rate constant for carbon-doped nano-heterojunctions and the standard photocatalyst was 0.0023 and -0.0081 min(-1), respectively. It is proposed that the photoexcited electrons (from the C 2p level) are effectively transferred from the conduction band of brookite to that of anatase causing efficient electron-hole separation, which is found to be responsible for the superior visible-light induced photocatalytic and antibacterial activities of carbon-doped anatase-brookite nano-heterojunctions.
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