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Photobiocidal Activity of TiO2/UHMWPE Composite Activated by Reduced Graphene Oxide under White Light.

ABSTRACT: Herein, we introduce a photobiocidal surface activated by white light. The photobiocidal surface was produced through thermocompressing a mixture of titanium dioxide (TiO2), 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.

SUBMITTER: Jeong SB 

PROVIDER: S-EPMC11299222 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature

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Photobiocidal Activity of TiO<sub>2</sub>/UHMWPE Composite Activated by Reduced Graphene Oxide under White Light.

Jeong Sang Bin SB   Heo Ki Joon KJ   Yoo Jae Hyun JH   Kang Dong-Gi DG   Santoni Leonardo L   Knapp Caroline E CE   Kafizas Andreas A   Carmalt Claire J CJ   Parkin Ivan P IP   Shin Jae Hak JH   Hwang Gi Byoung GB   Jung Jae Hee JH  

Nano letters 20240625 30

Herein, we introduce a photobiocidal surface activated by white light. The photobiocidal surface was produced through thermocompressing a mixture of titanium dioxide (TiO<sub>2</sub>), ultra-high-molecular-weight polyethylene (UHMWPE), and reduced graphene oxide (rGO) powders. A photobiocidal activity was not observed on UHMWPE-TiO<sub>2</sub>. However, UHMWPE-TiO<sub>2</sub>@rGO exhibited potent photobiocidal activity (>3-log reduction) against <i>Staphylococcus epidermidis</i> and <i>Escherich  ...[more]

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