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Graphene oxide-titanium dioxide (GO-TiO 2 ) composite was synthesized with one step hydrothermal process. The structure and morphology were characterized by field-emission-scanning-electron-microscopy, Thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Photocatalytic activity against  Escherichia coli  inactivation was carried out by GO-TiO 2  mixed with cement composite under visible light. The result revealed no significant difference between morphology of GO-TiO 2  and pristine TiO 2 . FESEM and FTIR results showed the presence of carbon component in the GO-TiO 2  composites. TGA-IR confirmed that the GO content (3%) in the composite could be controlled during the synthesis process. The synthesized GO-TiO 2  had stronger visible light absorption and narrower bandgap (3.11 eV) than TiO 2  (3.21 eV). The bandgap reduction was also observed in cement sample with GO-TiO 2  (3.08 eV) which could be beneficial for reducing the energy needed for photoexcitation. As a result, the specimen with GO-P25 outperformed specimens with others for  Escherichia coli  inactivation.

Visible light antibacterial potential of graphene-TiO 2 cementitious composites for self-sterilization surface