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1.3 PHYSICAL SCIENCES, 1.4 CHEMICAL SCIENCES, Inorganic and nuclear chemistry, Colloid chemistry
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 °C) non-hydrothermal 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 minutes 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 photo-excited 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.
KEYWORDS: Titanium dioxide; Microwave synthesis; Carbon-doping; Visible-light induced photocatalysis; Antibacterial activity; Heterojunctions
Etacheri, V. et al. 2013 A Highly Efficient TiO2-XCx Nano-Heterojunction Photocatalyst for Visible-Light Induced Antibacterial Applications. ACS Appl. Mater. Interfaces, 2013, 5, (5), pp 1663–1672. doi:10.1021/am302676a