1. Photobiocidal Activity of TiO 2 /UHMWPE Composite Activated by Reduced Graphene Oxide under White Light.
- Author
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Jeong SB, Heo KJ, Yoo JH, Kang DG, Santoni L, Knapp CE, Kafizas A, Carmalt CJ, Parkin IP, Shin JH, Hwang GB, and Jung JH
- Subjects
- Anti-Bacterial Agents pharmacology, Anti-Bacterial Agents chemistry, Reactive Oxygen Species metabolism, Ultraviolet Rays, Graphite chemistry, Graphite pharmacology, Graphite radiation effects, Titanium chemistry, Titanium pharmacology, Polyethylenes chemistry, Polyethylenes radiation effects, Polyethylenes pharmacology, Staphylococcus epidermidis drug effects, Escherichia coli drug effects, Light
- Abstract
Herein, we introduce a photobiocidal surface activated by white light. The photobiocidal surface was produced through thermocompressing a mixture of titanium dioxide (TiO
2 ), ultra-high-molecular-weight polyethylene (UHMWPE), and reduced graphene oxide (rGO) powders. A photobiocidal activity was not observed on UHMWPE-TiO2 . However, UHMWPE-TiO2 @rGO exhibited potent photobiocidal activity (>3-log reduction) against Staphylococcus epidermidis and Escherichia coli bacteria after a 12 h exposure to white light. The activity was even more potent against the phage phi 6 virus, a SARS-CoV-2 surrogate, with a >5-log reduction after 6 h exposure to white light. Our mechanistic studies showed that the UHMWPE-TiO2 @rGO was activated only by UV light, which accounts for 0.31% of the light emitted by the white LED lamp, producing reactive oxygen species that are lethal to microbes. This indicates that adding rGO to UHMWPE-TiO2 triggered intense photobiocidal activity even at shallow UV flux levels.- Published
- 2024
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