Study of photocatalytic damages induced on E. coli by different photocatalytic supports (various types and TiO2 configurations)
Identifieur interne : 000A78 ( Hal/Corpus ); précédent : 000A77; suivant : 000A79Study of photocatalytic damages induced on E. coli by different photocatalytic supports (various types and TiO2 configurations)
Auteurs : Marie Faure ; Fabien Gérardin ; Jean-Claude André ; Marie-Noëlle Pons ; Orfan ZahraaSource :
- Journal of Photochemistry and Photobiology A: Chemistry [ 1010-6030 ] ; 2011-08-15.
English descriptors
- mix :
Abstract
Photocatalysis, based on UV irradiation of a TiO2 support to generate oxygen free radicals, has been shown to have antibacterial properties, but the process has yet to be optimized. Photocatalytic inactivation of Gram negative bacteria, E. coil, was studied on five different photocatalytic supports, in terms of TiO2 type (Degussa P25/Millennium PC500) and configurations (catalyst was impregnated on supports, alone or with binder, or suspended in water). Several irradiation times were tested. Effective UV-A doses were estimated using a simulation based on a Monte Carlo approach to facilitate comparison between supports. For the same TiO2 type, inactivation efficiency was best with the "suspension" configuration (up to 4 log in 120 min) followed by the "impregnated without binder" configuration (up to 2 log in 120 min) and finally the configuration with binder (only 0.5 log after 120 min). In the "suspension" configuration, TiO2 P25 appeared to be more effective than TiO2 PC500. This may be due to smaller dispersed particle sizes. Our experiments highlight the importance of optimizing contact between the bacteria to be inactivated and titanium dioxide particles. Bacterial regrowth was compared on two culture media with different nutrients, and revealed metabolic damage induced by photocatalysis. Based on the classical Chick-Watson model, the kinetics of the photocatalytic process were determined, including a lag time for several supports.
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DOI: 10.1016/j.jphotochem.2011.07.003
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<front><div type="abstract" xml:lang="en">Photocatalysis, based on UV irradiation of a TiO2 support to generate oxygen free radicals, has been shown to have antibacterial properties, but the process has yet to be optimized. Photocatalytic inactivation of Gram negative bacteria, E. coil, was studied on five different photocatalytic supports, in terms of TiO2 type (Degussa P25/Millennium PC500) and configurations (catalyst was impregnated on supports, alone or with binder, or suspended in water). Several irradiation times were tested. Effective UV-A doses were estimated using a simulation based on a Monte Carlo approach to facilitate comparison between supports. For the same TiO2 type, inactivation efficiency was best with the "suspension" configuration (up to 4 log in 120 min) followed by the "impregnated without binder" configuration (up to 2 log in 120 min) and finally the configuration with binder (only 0.5 log after 120 min). In the "suspension" configuration, TiO2 P25 appeared to be more effective than TiO2 PC500. This may be due to smaller dispersed particle sizes. Our experiments highlight the importance of optimizing contact between the bacteria to be inactivated and titanium dioxide particles. Bacterial regrowth was compared on two culture media with different nutrients, and revealed metabolic damage induced by photocatalysis. Based on the classical Chick-Watson model, the kinetics of the photocatalytic process were determined, including a lag time for several supports.</div>
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<idno type="halRefHtml">Journal of Photochemistry and Photobiology A: Chemistry, Elsevier, 2011, 222 (2-3), pp.323-329. <10.1016/j.jphotochem.2011.07.003></idno>
<idno type="halRef">Journal of Photochemistry and Photobiology A: Chemistry, Elsevier, 2011, 222 (2-3), pp.323-329. <10.1016/j.jphotochem.2011.07.003></idno>
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<seriesStmt><idno type="stamp" n="SDE">Sciences De l'Environnement</idno>
<idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno>
<idno type="stamp" n="GIP-BE">GIP Bretagne Environnement</idno>
<idno type="stamp" n="LRGP-UL">LRGP</idno>
<idno type="stamp" n="UNIV-LORRAINE">Université de Lorraine</idno>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Study of photocatalytic damages induced on E. coli by different photocatalytic supports (various types and TiO2 configurations)</title>
<author role="aut"><persName><forename type="first">Marie</forename>
<surname>Faure</surname>
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<idno type="halAuthorId">394793</idno>
<affiliation ref="#struct-90587"></affiliation>
<affiliation ref="#struct-211875"></affiliation>
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<author role="aut"><persName><forename type="first">Fabien</forename>
<surname>Gérardin</surname>
</persName>
<idno type="halAuthorId">394794</idno>
<affiliation ref="#struct-90587"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Jean-Claude</forename>
<surname>André</surname>
</persName>
<idno type="halAuthorId">222110</idno>
<affiliation ref="#struct-211875"></affiliation>
</author>
<author role="crp"><persName><forename type="first">Marie-Noëlle</forename>
<surname>Pons</surname>
</persName>
<email>marie-noelle.pons@univ-lorraine.fr</email>
<idno type="halAuthorId">806183</idno>
<affiliation ref="#struct-211875"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Orfan</forename>
<surname>Zahraa</surname>
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<idno type="halAuthorId">376647</idno>
<affiliation ref="#struct-211875"></affiliation>
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<idno type="issn">1010-6030</idno>
<title level="j">Journal of Photochemistry and Photobiology A: Chemistry</title>
<imprint><publisher>Elsevier</publisher>
<biblScope unit="volume">222</biblScope>
<biblScope unit="issue">2-3</biblScope>
<biblScope unit="pp">323-329</biblScope>
<date type="datePub">2011-08-15</date>
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<idno type="doi">10.1016/j.jphotochem.2011.07.003</idno>
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<profileDesc><langUsage><language ident="en">English</language>
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<textClass><keywords scheme="author"><term xml:lang="en">Photocatalytic degradation</term>
<term xml:lang="en">E. coil</term>
<term xml:lang="en">Antibacterial</term>
<term xml:lang="en">Metabolic damage</term>
<term xml:lang="en">Monte Carlo approach</term>
<term xml:lang="en">VOLATILE ORGANIC-COMPOUNDS</term>
<term xml:lang="en">ESCHERICHIA-COLI</term>
<term xml:lang="en">GERMICIDAL IRRADIATION</term>
<term xml:lang="en">FLUORESCENT LIGHT</term>
<term xml:lang="en">WASTE-WATER</term>
<term xml:lang="en">INACTIVATION</term>
<term xml:lang="en">AIR</term>
<term xml:lang="en">DEGRADATION</term>
<term xml:lang="en">ENDOTOXIN</term>
<term xml:lang="en">REACTOR</term>
</keywords>
<classCode scheme="halDomain" n="spi.gproc">Engineering Sciences [physics]/Chemical and Process Engineering</classCode>
<classCode scheme="halDomain" n="sde.ie">Environmental Sciences/Environmental Engineering</classCode>
<classCode scheme="halTypology" n="ART">Journal articles</classCode>
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<abstract xml:lang="en">Photocatalysis, based on UV irradiation of a TiO2 support to generate oxygen free radicals, has been shown to have antibacterial properties, but the process has yet to be optimized. Photocatalytic inactivation of Gram negative bacteria, E. coil, was studied on five different photocatalytic supports, in terms of TiO2 type (Degussa P25/Millennium PC500) and configurations (catalyst was impregnated on supports, alone or with binder, or suspended in water). Several irradiation times were tested. Effective UV-A doses were estimated using a simulation based on a Monte Carlo approach to facilitate comparison between supports. For the same TiO2 type, inactivation efficiency was best with the "suspension" configuration (up to 4 log in 120 min) followed by the "impregnated without binder" configuration (up to 2 log in 120 min) and finally the configuration with binder (only 0.5 log after 120 min). In the "suspension" configuration, TiO2 P25 appeared to be more effective than TiO2 PC500. This may be due to smaller dispersed particle sizes. Our experiments highlight the importance of optimizing contact between the bacteria to be inactivated and titanium dioxide particles. Bacterial regrowth was compared on two culture media with different nutrients, and revealed metabolic damage induced by photocatalysis. Based on the classical Chick-Watson model, the kinetics of the photocatalytic process were determined, including a lag time for several supports.</abstract>
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