Abstract
“Titanium dioxide (TiO2) is a semiconductor material that exhibits antibacterial activity due to its photocatalytic properties under ultraviolet light. On the other hand, silver also exhibits strong antibacterial activity towards a wide range of microorganisms and TiO2 with silver addition exhibits more efficient photocatalytic properties than unmodified TiO2. In this work, TiO2 nanoparticles were synthesized by the hydrothermal method and modified with silver by two different methods: wet impregnation (Ex situ) and In situ incorporation. The antimicrobial activity of TiO2 nanoparticles synthesized and modified by both methods was evaluated against Escherichia coli and Staphylococcus aureus. The results showed that TiO2 nanoparticles have anatase phase. Also, spherical morphology with a mean particle size around 10.6 nm was obtained. The presence of silver in the modified TiO2 nanoparticles was confirmed by EDS and XPS. TiO2 particles modified by the Ex situ method, showed a better bactericidal activity compared to the particles modified by In situ incorporation method and TiO2 unmodified nanoparticles. This study demonstrated that both methods used to modify the titanium dioxide nanoparticles are effective as bactericidal materials and better results were found for the Ex situ method.”
Highlights
Titanium dioxide (TiO2) is a semiconductor material with three crystalline structures: Anatase, Rutile and Brookite
Since UV light accounts for only a small fraction (5%) of solar energy compared to visible light (~ 50%) their uses in everyday applications are limited
TiO2 nanoparticles were obtained by hydrothermal method and modified TiO2 nanoparticles with silver were obtained by wet impregnation (Ex situ) and In situ
Summary
Titanium dioxide (TiO2) is a semiconductor material with three crystalline structures: Anatase, Rutile and Brookite. Anatase is the most popular TiO2 crystalline form, and it is commonly used in photocatalyst application due to its band gap energy of 3.2 eV [1]. TiO2 particles are extensively known for their bactericidal effect when activated by UV light. When TiO2 is irradiated with energy greater than its band gap energy, an electron is excited from the valence band to the conduction band. The widespread technological use of TiO2 in photocatalysis is to some extent limited by its wide band gap of 3.2 eV, requiring UV light irradiation for photocatalytic activation. The shift in the optical response of TiO2 from the UV to the visible light range will have a positive effect on its practical applications
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