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Coupling APS/SPS Techniques for Cu-TiO2 Antibacterial Coating Deposition: Application to Water Treatment
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Coupling APS/SPS Techniques for Cu-TiO2 Antibacterial Coating Deposition: Application to Water Treatment
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Journal Article
Coupling APS/SPS Techniques for Cu-TiO2 Antibacterial Coating Deposition: Application to Water Treatment
2024
Overview
Since the COVID-19 pandemic, efforts in the field of surface decontamination have been redoubled. Finding innovative self-cleaning devices has become a challenge, and several solutions have been proposed in the market in recent years. In this work, an optimized powder/suspension plasma spray process at atmospheric pressure, using a Triplex Pro 210TM torch, is implemented to produce Cu-TiO2 surface coatings on stainless steel. The purpose is to investigate the potential improvement of antibacterial efficacy by the reactive surface species generated from TiO2 photoactivity under irradiation. A water-based suspension, prepared with AnalaR NORMAPURTM TiO2, is used as a precursor to incorporate the photocatalyst into an antibacterial copper matrix. Surface antibacterial tests according to ASTM 2180 standards were performed, and experiments were performed in treated contaminated water. Sub-stoichiometric blue TiO2 coatings showed complete bacterial elimination after 90 min of visible light irradiation, and Cu-TiO2 surface coatings were even able to disinfect the surfaces under white light, making the application interesting for bacterial destruction under natural illumination. These materials are also intended for application in water treatment, including both pathogens and chemical micropollutants, which is a pressing issue facing many countries today.
