title: Differences in elimination efficiencies of Escherichia coli in freshwater and seawater as a result of TiO2 photocatalysis.
abstract: The effects of UV irradiation on the respiration and survival of Escherichia coli in various concentrations of aqueous NaCl were investigated in the presence of a photocatalyst. In this study, we anticipated that the photocatalysis of residual chlorine generated in a solution containing Cl(-) would result in bacterial elimination. Our results indicated a gradual reduction in the E. coli survival ratio in freshwater; however, no decrease in total abundance was observed during 8 h of photocatalysis with UV irradiation. Conversely, the survival ratio of E. coli in the artificial seawater decreased drastically as a consequence of photocatalysis, with a concomitant decrease in total abundance. These results revealed that the chlorinated active species that formed on the photocatalyst surface influenced the observed inactivation.
authors.affiliation: Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology, Onogawa 16-1, Tsukuba 305-8569, Japan.
authors.forename: Namiha
authors.initials: N
authors.lastname: Yamada
authors.forename: Masahiro
authors.initials: M
authors.lastname: Suzumura
authors.forename: Fumiko
authors.initials: F
authors.lastname: Koiwa
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Negishi
mesh_terms: D002713:Chlorine / Q000737:chemistry; D004926:Escherichia coli / Q000187:drug effects / Q000502:physiology / Q000528:radiation effects*; D005618:Fresh Water / Q000737:chemistry* / Q000382:microbiology; D010782:Photolysis; D012623:Seawater / Q000737:chemistry* / Q000382:microbiology; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D018508:Water Purification
chemical_list: C009495:titanium dioxide; D002713:Chlorine; D014025:Titanium