Investigation ofE. colibacteria inactivation by photocatalytic activity of TiO2coated expanded polystyrene foam
| Autor: | Simona Tuckute, D. Milcius, Šarūnas Varnagiris, Sandra Sakalauskaite, Rimantas Daugelavičius, Martynas Lelis |
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| Rok vydání: | 2017 |
| Předmět: |
Anatase
Materials science Polymers and Plastics 02 engineering and technology 010402 general chemistry medicine.disease_cause 01 natural sciences Biomaterials chemistry.chemical_compound medicine Organic chemistry Irradiation Escherichia coli Aqueous solution biology Metals and Alloys 021001 nanoscience & nanotechnology biology.organism_classification 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Photocatalysis 0210 nano-technology Bacterial outer membrane Methylene blue Bacteria Nuclear chemistry |
| Zdroj: | Materials Research Express. 4:036409 |
| ISSN: | 2053-1591 |
| DOI: | 10.1088/2053-1591/aa6604 |
| Popis: | Photocatalytic properties of anatase and other TiO2 polymorphs are widely researched and applied in practical application. In current study TiO2 films on the plasma pre-treated expanded polystyrene (EPS) foam were deposited using magnetron sputtering technique. Main properties of the films were characterised using combination of XRD, XPS and SEM techniques. Photocatalytic properties of the observed crystalline anatase phase were tested by investigating bleaching of the methylene blue (MB) aqueous solution and by testing Escherichia coli (E. coli) viability after incubation under UV-B irradiation. E. coli viability experiments indicated that there are two mechanisms of E. coli bacteria inactivation. UV irradiation alone causes rapid damage to the outer membrane of E. coli bacteria. The second mechanism of E. coli inactivation is invoked only with synergistic combination of TiO2 and UV. Acting as photocatalyst TiO2 generates active radicals who initiate the chain peroxidation of organic molecules and within 45 min reduce E. coli bacteria viability by nearly 90%. |
| Databáze: | OpenAIRE |
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