The fungicidal effect of TiO2 doped with metallic ions

Corina Dana Miscă, Carmen Lazau, Cornelia Ratiu, Paula Sfirloaga, Corina Orha, Ioan Grozescu, Paul Barvinschi, Alina Anghelina
Incorporating metal ion dopants into the titanium dioxide particles can influence the performance of the photocatalysis. This affects the dynamics of electron-ion recombination and interfacial charge transfer. We might tell there is an optimum dopant concentration to enhance the photocatalytic activity. Metals ions serve as shallow trapping sites for the charge carriers so as separates the arrival time of e- and H+ at the surface. Photocatalytic oxidation is based on the production of several highly reactive short-lived chemical compounds—oxygen-based radicals and ions—that are effective in microorganism disinfection and neutralizing volatile organic compounds. Usually the microorganism is completely destroyed. In this paper we report the effect of TiO2 that was doped with different metal ions on Aspergillus fungi that was isolated from the wheat. The metals ion that was using like dopants was: silver and platinum. In the powder with TiO2 the metallic ions appear in different percentage and became from the different precursors organic or non-organic. Our experiments show that the TiO2 doped with platinum has the better fungicidal effects like TiO2 doped with silver. It is possible that photocatalytic oxidation could become one of the decontamination methods of the future.
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