title: Microbial inactivation kinetics and mechanisms of carbon-doped TiO2 (C-TiO2) under visible light.
abstract: In this study, titanium dioxide nanoparticles doped with carbon (C-TiO2) were synthesized by means of sol-gel methods, and the synthesis was verified by means of X-ray photoelectron spectroscopy. The nanoparticles' photocatalytic disinfection activity of Listeria monocytogenes was tested under UV and visible light. The observed inactivation levels for 150min of visible light exposure with and without UV cutoff filters were 2.10 and 2.45 log, respectively. We also found that traditional reactive oxygen species had insignificant actions on C-TiO2 photocatalysts and that L. monocytogenes inactivation in the C-TiO2 system under visible light was induced in large part by the midgap states (hmid(+)) that was produced photochemically from the visible light response. C-TiO2 was found to accelerate bacterial inactivation (of L. monocytogenes) in the presence of visible light. Our data suggests that the C-TiO2 may be useful in the development of alternative disinfectants for environmental applications.
authors.affiliation: Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, South Korea; School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE 68583-0817, USA.
authors.forename: Jaehong
authors.initials: J
authors.lastname: Shim
authors.affiliation: Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, South Korea.
authors.forename: Young-Seok
authors.initials: YS
authors.lastname: Seo
authors.affiliation: Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, South Korea.
authors.forename: Byung-Taek
authors.initials: BT
authors.lastname: Oh
authors.affiliation: Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, South Korea. Electronic address: cho317@jbnu.ac.kr.
authors.forename: Min
authors.initials: M
authors.lastname: Cho
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D004203:Disinfection / Q000379:methods; D007700:Kinetics; D008027:Light; D008089:Listeria monocytogenes / Q000187:drug effects* / Q000254:growth & development; D050296:Microbial Viability / Q000187:drug effects; D053758:Nanoparticles / Q000737:chemistry / Q000528:radiation effects / Q000633:toxicity*; D056951:Photoelectron Spectroscopy; D014025:Titanium / Q000737:chemistry / Q000528:radiation effects / Q000633:toxicity*
chemical_list: C009495:titanium dioxide; D002244:Carbon; D014025:Titanium
keywords: Carbon (C); Disinfection; Photocatalyst; Sol–gel methods; Titanium dioxide nanoparticle (TiO(2))