Anti-bacterial activity of indoor-light activated photocatalysts

作者：Synnott Damian W; Seery Michael K; Hinder Steven J; Michlits Georg; Pillai Suresh C^*

来源：Applied Catalysis B: Environmental , 2013, 130: 106-111.

DOI：10.1016/j.apcatb.2012.10.020

• 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)

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 60 W 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 5 h) 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.

• 出版日期2013-2-7