Disinfection of E-coli by the Ag-TiO2/UV system: lipidperoxidation


Sokmen M., Candan F. , Sumer Z.

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, vol.143, pp.241-244, 2001 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 143
  • Publication Date: 2001
  • Doi Number: 10.1016/s1010-6030(01)00497-x
  • Title of Journal : JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
  • Page Numbers: pp.241-244

Abstract

The photocatalytic disinfection of Escherichia coli, a pathogenic micro-organism. was investigated. An aqueous suspension of the micro-organism (1 x 10(8) cfu/ml) and neat TiO2 or silver-loaded TiO2 Were irradiated with a high pressure mercury lamp for various time periods at neutral pH (7.0). Silver loading (1%, w/w) dramatically reduced the illumination time for complete degradation (less than 1-2 min) and minimum catalyst concentration was determined as 0.1 mg/mL Possible killing mechanism and intermediate products were also determined. Occurrence of lipidperoxidation which produces malondialdehyde (MDA) was proposed but the method employed was so effective that all micro-organisms and intermediate products were further degraded to harmless products. (C) 2001 Elsevier Science B.V. All rights reserved.