▎ 摘　　要

In this study, bacterial cellulose (BC) was used as a matrix to synthesize graphene oxide/Titanium dioxide (GO-TiO2)-based hybrid materials. It was indicated by X-ray diffraction and selected area electron diffraction that the crystal structure of GO-TiO2 was a mixed phase containing anatase and rutile. TiO2 nanoparticles were of 10-30 nm diameters and densely anchored on graphene oxide sheets. Superiorphotocatalytic performance of the GO-TiO2 was achieved under near UV excitation. The photocatalytic efficiency was optimized through controlling an appropriate calcined temperature. The obtained GO TiO2 nanoparticles were filled into porous BC matrix (GO-TiO2/BC), and the photocatalytic properties of GO-TiO2 nanoparticles were well maintained. Consistent with photocatalytic performance of TiO2, GO-TiO2/BC generated reactive oxygen species after near ultraviolet irradiation. No dark cytotoxicity was observed at the long incubation time. In parallel, following exposure of Staphylococcus aureus cells to GO-TiO2 and irradiation, a significant decrease in cell viability, as well as an increased production of reactive oxygen species was observed, which induced cellular death. The results indicated that GO TiO2/BC possess an excellent photodynamic antibacterial activity. (C) 2017 Elsevier Ltd. All rights reserved.