Detailed Insight into Photocatalytic Inactivation of Pathogenic Bacteria in the Presence of Visible-Light-Active Multicomponent Photocatalysts

Magda Kozak; Paweł Mazierski; Joanna Żebrowska; Tomasz Klimczuk; Wojciech Lisowski; Andrzej Żak; Piotr M. Skowron; Adriana Zaleska-Medynska

doi:10.3390/nano14050409

Detailed Insight into Photocatalytic Inactivation of Pathogenic Bacteria in the Presence of Visible-Light-Active Multicomponent Photocatalysts

Abstract

The use of heterogeneous photocatalysis in biologically contaminated water purification processes still requires the development of materials active in visible light, preferably in the form of thin films. Herein, we report nanotube structures made of TiO2/Ag2O/Au0, TiO2/Ag2O/PtOx, TiO2/Cu2O/Au0, and TiO2/Cu2O/PtOx obtained via one-step anodic oxidation of the titanium-based alloys (Ti94Ag5Au1, Ti94Cu5Pt1, Ti94Cu5Au1, and Ti94Ag5Pt1) possessing high visible light activity in the inactivation process of methicillin-susceptible S. aureus and other pathogenic bacteria—E. coli, Clostridium sp., and K. oxytoca. In the samples made from Ti-based alloys, metal/metal oxide nanoparticles were formed, which were located on the surface and inside the walls of the NTs. The obtained results showed that oxygen species produced at the surface of irradiated photocatalysts and the presence of copper and silver species in the photoactive layers both contributed to the inactivation of bacteria. Photocatalytic inactivation of E. coli, S. aureus, and Clostridium sp. was confirmed via TEM imaging of bacterium cell destruction and the detection of CO2 as a result of bacteria cell mineralization for the most active sample. These results suggest that the membrane ruptures as a result of the attack of

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Authors (8)

Magda Kozak
Paweł Mazierski dr inż.
Joanna Żebrowska
Tomasz Klimczuk prof. dr hab. inż.
Wojciech Lisowski dr hab.
Andrzej Żak
Piotr M. Skowron
Adriana Zaleska-Medynska prof. dr hab.

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Keywords

PÓŁPRZEWODNIKI

Details

Category:

Articles

Type:

artykuły w czasopismach

Published in:

Nanomaterials no. 14,
ISSN: 2079-4991

Language:

English

Publication year:

2024

Bibliographic description:

Kozak M., Mazierski P., Żebrowska J., Klimczuk T., Lisowski W., Żak A., Skowron P. M., Zaleska-Medynska A.: Detailed Insight into Photocatalytic Inactivation of Pathogenic Bacteria in the Presence of Visible-Light-Active Multicomponent Photocatalysts// Nanomaterials -Vol. 14,iss. 5 (2024), s.409-

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