| Autor: |
Jeong SB; Department of Mechanical Engineering, Sejong University, Seoul 05006, Republic of Korea.; Indoor Environment Center, Korea Testing Laboratory, Seoul 08389, Republic of Korea., Heo KJ; School of Mechanical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea., Yoo JH; Lab. M.0, Seoul 04799, Republic of Korea., Kang DG; Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom., Santoni L; Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom., Knapp CE; Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom., Kafizas A; Department of Chemistry, Imperial College London, Molecular Science Research Hub, White City Campus, 80 Wood Lane, London W12 OBZ, United Kingdom., Carmalt CJ; Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom., Parkin IP; Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom., Shin JH; Department of Mechanical Engineering, Sejong University, Seoul 05006, Republic of Korea., Hwang GB; Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom., Jung JH; Department of Mechanical Engineering, Sejong University, Seoul 05006, Republic of Korea. |
| Abstrakt: |
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-TiO 2 . However, UHMWPE-TiO 2 @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-TiO 2 @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-TiO 2 triggered intense photobiocidal activity even at shallow UV flux levels. |
