Issue 59, 2014
From the journal:

RSC Advances

Photocatalytic inactivation of particle-associated Escherichia coli using UV/TiO2

Shilin Yu,a   Tao Lin*ab  and  Wei Chen*ab  

* Corresponding authors

a College of Environment, Hohai University, Nanjing 210098, PR China
E-mail: cw5826@hhu.edu.cn (W.C.), hit_lintao@163.com (T.L.)

b Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, PR China

Abstract

We investigated the photocatalytic inactivation of free Escherichia coli and E. coli attached to carbon particles using granulated activated carbon filter effluent as a water sample. The inactivation rates of both free and attached E. coli exposed to UV/TiO2 were higher than that using UV irradiation alone. However, attached E. coli was barely inactivated because of the protection of particles, which acted as hotspots for protection against inactivation of attached E. coli in the effluent. During inactivation, a lower UV irradiation intensity favored inactivation by UV/TiO2 for a given UV irradiation dose (irradiation intensity over time), because a longer irradiation period favored higher disinfection efficiency. Particles with a diameter >8 μm were predominantly responsible for protecting attached E. coli, and a higher particle concentration was associated with lower inactivation. The reactivation of E. coli after UV/TiO2 disinfection was lower than that after UV irradiation alone, and the reactivation rate decreased with increasing UV irradiation dose.

Graphical abstract: Photocatalytic inactivation of particle-associated Escherichia coli using UV/TiO2

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Article information

DOI
https://doi.org/10.1039/C4RA04061A
Article type
Paper
Submitted
03 May 2014
Accepted
07 Jul 2014
First published
07 Jul 2014

RSC Adv., 2014,4, 31370-31377

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Photocatalytic inactivation of particle-associated Escherichia coli using UV/TiO2

S. Yu, T. Lin and W. Chen, RSC Adv., 2014, 4, 31370 DOI: 10.1039/C4RA04061A

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