Abstract:This study aimed to investigate the antibacterial properties effect of common metal ions doping on antibacterial tablets, providing a technical basis for the preparation and improvement of novel nano-TiO2 antibacterial tablets. The fixed mass fractions of Ag+、Zn2+and Fe3+ doped on TiO2 antibacterial tablets were selected for comparative research, and the antibacterial properties were in-depth evaluated by antibacterial circle, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) methods. The microscopic structure was characterized and analyzed to investigate the reasons for the differences in antibacterial properties. The results showed that the order of antibacterial activity was Ag@TiO2>Zn@TiO2>Fe@TiO2. Zn@TiO2 had higher antibacterial activity but poorer antibacterial stability. The MIC and MBC of Ag@TiO2 for Escherichia coli and Staphylococcus aureus were 10 mg/L and 20 mg/L, while those of Zn@TiO2 were 30 mg/L and 50 mg/L, respectively. Characterization revealed that the antibacterial activity was mainly attributed to the number and stability of active sites produced by the interaction between the nano-TiO2 surface and metal ions, and it was not closely related to the pore structure or surface functional groups.
