Synergistic Antibacterial Performance of a Cu/WO<sub>3</sub>-Added PTFE Particulate Superhydrophobic Composite under Visible-Light Exposure — Oak Academic Publishing
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Synergistic Antibacterial Performance of a Cu/WO<sub>3</sub>-Added PTFE Particulate Superhydrophobic Composite under Visible-Light Exposure
Kanagawa Academy of Science and Technology, Kawasaki, Japan
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Collaborative Research Centre, Daido University, Nagoya, Japan
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Department of Information Design, Daido University, Nagoya, Japan
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Kanagawa Academy of Science and Technology, Kawasaki, Japan
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Kanagawa Academy of Science and Technology, Kawasaki, Japan
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Department of Urology and Molecular Science, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
1 Kanagawa Academy of Science and Technology, Kawasaki, Japan
2 Collaborative Research Centre, Daido University, Nagoya, Japan
3 Department of Information Design, Daido University, Nagoya, Japan
4 Kanagawa Academy of Science and Technology, Kawasaki, Japan
5 Kanagawa Academy of Science and Technology, Kawasaki, Japan
6 Department of Urology and Molecular Science, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
Addition of TiO 2 to a polytetrafluoroethylene (PTFE) particle-dispersed composite contributes to the self-cleaning properties of the water-repellent composite. However, its application is limited to outdoor usage or under ultraviolet (UV) irradiation. In this study, a novel visible-light-sensitive photocatalytic and superhydrophobic material was developed by adding Cu/WO 3 to a PTFE particulate composite material to overcome this deficit. A remarkable property of this novel composite material is the synergistic antibacterial performance against Escherichia coli (E. coli) , Staphylo-coccus aureus, and methicillin-resistant Staphylococcus aureus compared with the addition of Cu/WO 3 without PTFE particles material. During 24-h exposure in visible light at 2000 lx, the number of viable cells of the three strains on the surface of the 8wt% Cu/WO 3 -added PTFE particulate composite decreased from 2 – 4 × 10 5 colony-formation units (CFUs) to less than 10, the limit of detection. This bactericidal rate is four times higher than that of 8wt% Cu/WO 3 without PTFE particles material, which is attributed to the air trapped in the rough surface of the novel material providing additional oxygen to the photocatalytic reaction. Even for exposure to visible light at 100 lx, the decrease in CFUs of E. coli on the 12wt% Cu/WO 3 -added PTFE particulate composite reached nearly 2.0 logs. The characterization of the Cu/WO 3 -added PTFE particulate composite indicated that the composite material containing 80wt% PTFE maintained a superhydrophobic or water-repellent property with a water contact angle >150 。 , although the Cu/WO 3 in the composite material remained hydrophilic under visible light. The Cu/WO 3 -added PTFE particulate composite displayed photo-catalytic reactions to decompose oleic acid adsorbed on its surface and gaseous acetaldehyde under UV-A and visible-light illumination. All results demonstrate that the Cu/WO 3 -added PTFE particulate composite material may be used in sterilization, as a water repellent, for self-cleaning, and in the oxidative decomposition of volatile organic compounds (VOC) both indoors and outdoors.
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