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Photobiocidal Activity of TiO 2 /UHMWPE Composite Activated by Reduced Graphene Oxide under White Light.
- Source :
-
Nano letters [Nano Lett] 2024 Jul 31; Vol. 24 (30), pp. 9155-9162. Date of Electronic Publication: 2024 Jun 25. - Publication Year :
- 2024
-
Abstract
- Herein, we introduce a photobiocidal surface activated by white light. The photobiocidal surface was produced through thermocompressing a mixture of titanium dioxide (TiO <subscript>2</subscript> ), ultra-high-molecular-weight polyethylene (UHMWPE), and reduced graphene oxide (rGO) powders. A photobiocidal activity was not observed on UHMWPE-TiO <subscript>2</subscript> . However, UHMWPE-TiO <subscript>2</subscript> @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 <subscript>2</subscript> @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 <subscript>2</subscript> triggered intense photobiocidal activity even at shallow UV flux levels.
- 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
Subjects
Details
- Language :
- English
- ISSN :
- 1530-6992
- Volume :
- 24
- Issue :
- 30
- Database :
- MEDLINE
- Journal :
- Nano letters
- Publication Type :
- Academic Journal
- Accession number :
- 38917338
- Full Text :
- https://doi.org/10.1021/acs.nanolett.4c00939