Anti-bacterial activity of indoor-light activated photocatalysts

Authors: Damian W. Synnott, Michael K. Seery, Steven J. Hinder, Georg Michlits, Suresh C. Pillai

Abstract:
Nanocrystalline photocatalysts, prepared under ambient conditions using a microwave assisted synthesis, show indoor light photocatalytic activity for the degradation of Staphylococcus aureus and Escherichia coli. The zinc sulphide (ZnS) nanomaterials, prepared by a microwave assisted synthesis, are shown to be cubic blende structure with an average crystallite size of 4–6 nm. The anti-bacterial activity of these nanomaterials is investigated under irradiation from a 60W light bulb and photocatalytic activity is revealed to be due to the defects present in the crystal structure. The ZnS shows anti-bacterial action as both a bacteriostatic and bacteriocidal (88% reduction in the amount of bacteria in 5h) material and the methods of bacterial degradation on the ZnS is discussed. The anti-bacterial actions of these materials were also compared with commercial ZnS and Evonik-Degussa P-25. A detailed mechanism for the light absorption in the visible light region of the microwave prepared ZnS is proposed based on the luminescence spectroscopy.

Keywords:
Gram positive and gram negative bacteria
Decontamination
Visible light
XPS
Solar
Anti-microbial
ZnO
MRSA
Green and energy efficient synthesis
Anti-MRSA coatings
Hospital acquired infections
Photo-activity
Emerging pollutants
TiO₂
Degussa P-25
Cell wall
Disinfection
Micro-biology
Doping
Band gap
Escherichia coli
P. aerginosa
Methicillin-resistant
Staphylococcus aureus
(MRSA)

Published in: Applied Catalysis B: Environmental (Volumes 130–131, Pages 1-336, 7 February 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Anti-bacterial activity of indoor-light activated photocatalysts

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