Photocatalytic Inhibition of Gram-positive and Gram-negative Bacteria by Nanoparticulate C-doped TiO2

Abstract

Abstract C-doped TiO2 (C-TiO2) was synthesised using a solvothermal method with ethanol/TBT/LDPE medium. Microstructure and elemental composition of C-TiO2 were analysed with TEM and XPS. An anti-bacterial device was utilized for photocatalytic inhibition of gram-positive and gram-negative bacteria. The device to measure bacteriostatic action was placed in a dark room, and the bacterial culture was placed in a holding cup which contained holding box and nanoparticulate C-TiO2. This approach was convenient for addition and removal of C-TiO2. Photocatalytic bacteriostasis by C-TiO2 under visible-light irradiation was quantitively assessed for bacteriostatic properties. Moreover, the qualitative assessment of anti-bacterial activity with C-TiO2 was less significant for gram-positive bacteria in comparison to gram-negative bacteria.