Correlation of Photocatalytic Bactericidal Effect and Organic Matter Degradation of TiO2 Part I: Observation of Phenomena
- 21 January 2009
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 43 (4), 1180-1184
- https://doi.org/10.1021/es802499t
Abstract
This study aims to investigate the correlation of the photocatalytic oxidation effect of decomposing organic matter and inactivating bacteria using two different TiO2 materials: a Degussa P25 powder film and a commercial TiO2 thin film. The destructed organic matter was formaldehyde and the test bacterium was E. coli (JM 109 strain). The decomposition tests and the bactericidal tests were carried out in a plate reactor and on the TiO2 surface, respectively. Observations indicate that there exists an apparent correlation between the two photocatalytic processes of decomposing formaldehyde and inactivating E. coli. However, it is essential to distinguish the exact driver for microbe inactivation, in which both UV light irradiation and reactive oxygen species reaction are direct factors of disinfection, and for organic matter, in which only reactive oxygen species reaction contributes to degradation. Observations from this study would make it possible to use analogy as a potential method to evaluate the antimicrobial effect based on the organic compound degradation effect, whereby the latter is much easier to measure quantitatively.Keywords
This publication has 18 references indexed in Scilit:
- UV-PCO device for indoor VOCs removal: Investigation on multiple compounds effectJournal of Affective Disorders, 2008
- Tools for performance simulation of heat, air and moisture conditions of whole buildingsBuilding Simulation, 2008
- Photocatalytic inactivation of Escherischia coli: Effect of concentration of TiO2 and microorganism, nature, and intensity of UV irradiationApplied Catalysis B: Environment and Energy, 2007
- Microbiological disinfection of water and air by photocatalysisComptes Rendus. Chimie, 2007
- Study on light intensity in the process of photocatalytic degradation of indoor gaseous formaldehyde for saving energyEnergy Conversion and Management, 2006
- Bactericidal action of illuminated TiO2 on pure Escherichia coli and natural bacterial consortia: post-irradiation events in the dark and assessment of the effective disinfection timeApplied Catalysis B: Environment and Energy, 2004
- Photocatalytical inactivation of E. coli: effect of (continuous–intermittent) light intensity and of (suspended–fixed) TiO2 concentrationApplied Catalysis B: Environment and Energy, 2003
- A study of the photocatalytic oxidation of formaldehyde on Pt/Fe2O3/TiO2Journal of Photochemistry and Photobiology A: Chemistry, 2000
- Photocatalytic Degradation of Gaseous Formaldehyde Using TiO2 FilmEnvironmental Science & Technology, 1998
- Dynamics of dissipation processes in the Ag–Xe complexThe Journal of Chemical Physics, 1997