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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
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Plasma electrolytic titanium oxide applied for pathogenic bacteria inactivation
Carlise Hannel Ferreira1, Sabrina Candido Nunes1, Vidiany Aparecida Queiroz Santos1
1Department of Chemistry, Federal Technological University of Paraná (UTFPR), Pato Branco, Brazil.
Environmental Technology
|June 21, 2018
Summary
Titanium dioxide (TiO2) coatings synthesized via plasma electrolytic oxidation show enhanced photocatalytic activity for inactivating pathogenic bacteria. Larger pore diameters and crystallite sizes correlate with greater antibacterial photoactivity, improving effluent treatment.
Area of Science:
- Materials Science
- Environmental Science
- Microbiology
Background:
- Titanium dioxide (TiO2) photocatalysis is crucial for treating organic pollutants and inactivating pathogenic microorganisms in effluents.
- Plasma electrolytic oxidation (PEO) is a method for synthesizing TiO2 coatings with tailored properties.
Purpose of the Study:
- To investigate the pathogenic bacteria inhibitory photoactivity of TiO2 coatings synthesized by PEO.
- To correlate the photocatalytic activity with the microstructure, specifically pore diameter and crystallite size.
Main Methods:
- Synthesis of TiO2 coatings using plasma electrolytic oxidation (PEO).
- Investigation of photocatalytic activity for inactivating Staphylococcus aureus and Salmonella bongori.
- Correlation of antibacterial photoactivity with pore diameter and crystallite size.
Main Results:
- Antibacterial photoactivity is significantly influenced by the morphology and microstructure of TiO2 coatings.
- Larger crystallite size and pore diameter resulted in greater photocatalytic activity.
- Coatings with pore diameters smaller than the target microorganisms exhibited low photoactivity.
Conclusions:
- TiO2 coatings with pore diameters comparable to or larger than microorganisms enhance photocatalytic inactivation by facilitating cell entry and membrane rupture.
- Optimizing pore size in TiO2 coatings is essential for effective microorganism inactivation in effluent treatment.
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