Efficiency evaluation of different TiO 2 coatings on the photocatalytic inactivation of airborne bacterial spores
The performance of different TiO 2 coatings is compared for the photocatalytic inactivation of dry Bacillus subtilis spores dispersed on TiO 2 films under UV-A radiation. Three different TiO 2 coatings were assayed: Degussa P-25, sol-gel, and composite sol-gel/Degussa P-25. The influence of the incr...
| Autores: | , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2012 |
| País: | Argentina |
| Recursos: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositório: | CONICET Digital (CONICET) |
| Idioma: | inglês |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/150153 |
| Acesso em linha: | http://hdl.handle.net/11336/150153 |
| Access Level: | Acceso aberto |
| Palavra-chave: | PHOTOCATALITYC INACTIVATION UV-A TIO2 COATING https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 |
| Resumo: | The performance of different TiO 2 coatings is compared for the photocatalytic inactivation of dry Bacillus subtilis spores dispersed on TiO 2 films under UV-A radiation. Three different TiO 2 coatings were assayed: Degussa P-25, sol-gel, and composite sol-gel/Degussa P-25. The influence of the increase in the number of TiO 2 layers was also studied. Furthermore, the amount of TiO 2 deposited on the borosilicate glass plates and the fraction of energy effectively absorbed by the catalytic films were determined. Spectral diffuse transmittance and reflectance measurements were performed using a spectroradiometer with an integrating-sphere attachment. The net-radiation method was then applied to evaluate the fraction of energy absorbed by the coatings. To objectively compare the performance of the catalytic films, two types of efficiencies were calculated: the photonic efficiency and the quantum efficiency of inactivation. The highest quantum efficiency was obtained with the TiO 2 Degussa P-25 coating with two layers. © 2012 American Chemical Society. |
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