Bio-mediated synthesis and antibacterial activity against aquatic pathogens of silver nanoparticles decorated titania nanosheets in dark and under solar-light irradiation

摘要

Antibacterial nanomaterials produced by sustainable or 'green' synthesis methods are very important. Moreover, combination of photocatalytic antibacterial materials and antiseptic inorganic nanoparticles still remains challenging. This work reports on the two-step, green biosynthesis, characterization and antibacterial activity against aquatic pathogens of a nanocomposite formed from titanium dioxide (TiO2) nanosheets decorated with silver nanoparticles (Ag NPs), in which the grape seeds extract is used as the reducing and stabilizing agent. The as-prepared Ag/TiO2 nanocomposites were characterized by various methods. The appearance of absorption peak at about 425 nm demonstrates the formation of Ag NPs due to the typical surface plasmon resonance (SPR) effect of silver. The antibacterial activity of Ag/TiO2 nanocomposites against 6 kinds of common aquatic pathogens in the dark was tested. Furthermore, the bactericidal efficiency of the prepared nanocomposites with different contents of TiO2 nanosheets in the dark or under solar-light irradiation was compared.