Inactivation and Mineralization of Aerosol Deposited Model Pathogenic Microorganisms over TiO2 and Pt/TiO2 Full article
| Journal |
Environmental Science and Technology
ISSN: 0013-936X , E-ISSN: 1520-5851 |
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| Output data | Year: 2010, Volume: 44, Number: 13, Pages: 5121-5126 Pages count : 6 DOI: 10.1021/es100156p | ||||
| Tags | ESCHERICHIA-COLI; PHOTOCATALYTIC INACTIVATION; WATER DISINFECTION; AIRBORNE SURVIVAL; TITANIUM-DIOXIDE; SULFURIC-ACID; OXIDATION; SURFACES; BACTERIA; NITROGEN | ||||
| Authors |
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| Affiliations |
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Funding (6)
| 1 | North Atlantic Treaty Organization | SfP-981461 |
| 2 | International Science and Technology Center | 3305 |
| 3 | Siberian Branch of the Russian Academy of Sciences | 70 |
| 4 | Президиум РАН | 27.56 |
| 5 | The Ministry of Education and Science of the Russian Federation | |
| 6 | Siberian Branch of the Russian Academy of Sciences | 36 |
Abstract:
Air disinfection from bacteria and viruses by means of photocatalytic oxidation is investigated with microorganisms loaded over photocatalysts' films from aerosols. Deposition method and equipment have been developed to load Mycobacterium smegmatis , Bacillus thuringiensis , vaccinia virus, and influenza A (H3N2) virus on slides with undoped TiO(2) and platinized sulfated TiO(2) (Pt/TiO(2)). Inactivation dynamics was measured under UVA irradiation and in the dark. About 90% inactivation is reached in 30 min irradiation on TiO(2) and from 90 to 99.8% on Pt/TiO(2). The first-order inactivation rate coefficient ranged from 0.18 to 0.03 min(-1), over Pt/TiO(2) being higher than on TiO(2) for all microorganisms except Bacillus thuringiensis. The photocatalytic mineralization of Bacillus thuringiensis was performed on TiO(2) and Pt/TiO(2) with different photocatalyst and microorganism loadings. Completeness of mineralization depended on the TiO(2) to bacteria mass ratio. The rate of the photocatalytic carbon dioxide production grows with both the cell mass increase and the photocatalyst mass increase. Pt/TiO(2) showed increased rate of mineralization as well as of the inactivation likely due to a better charge carrier separation in the doped semiconductor photocatalyst. The results demonstrate that photocatalytic filters with deposited TiO(2) or Pt/TiO(2) are able to inactivate aerosol microorganisms and completely decompose them into inorganic products and Pt/TiO(2) provides higher disinfection and mineralization rates.
Cite:
Kozlova E.A.
, Safatov A.S.
, Kiselev S.A.
, Marchenko V.Y.
, Sergeev A.A.
, Skarnovich M.O.
, Emelyanova E.K.
, Smetannikova M.A.
, Buryak G.A.
, Vorontsov A.V.
Inactivation and Mineralization of Aerosol Deposited Model Pathogenic Microorganisms over TiO2 and Pt/TiO2
Environmental Science and Technology. 2010. V.44. N13. P.5121-5126. DOI: 10.1021/es100156p WOS Scopus РИНЦ ANCAN PMID OpenAlex
Inactivation and Mineralization of Aerosol Deposited Model Pathogenic Microorganisms over TiO2 and Pt/TiO2
Environmental Science and Technology. 2010. V.44. N13. P.5121-5126. DOI: 10.1021/es100156p WOS Scopus РИНЦ ANCAN PMID OpenAlex
Dates:
| Submitted: | Jan 28, 2010 |
| Accepted: | May 7, 2010 |
| Published online: | Jun 3, 2010 |
| Published print: | Jul 1, 2010 |
Identifiers:
| Web of science: | WOS:000279304700049 |
| Scopus: | 2-s2.0-77954253937 |
| Elibrary: | 15336491 |
| Chemical Abstracts: | 2010:696605 |
| Chemical Abstracts (print): | 153:124445 |
| PMID: | 20521809 |
| OpenAlex: | W2090520723 |