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Using Gd-Enhanced $β-NaYF_{4}$:Yb,Er Fluorescent Nanorods Coupled to Reduced $TiO_{2}$ for the NIR-Triggered Photocatalytic Inactivation of Escherichia coli
| Content Provider | MDPI |
|---|---|
| Author | Zhou, Huang He, Fengjiao |
| Copyright Year | 2021 |
| Description | β-NaYF4:Yb,Er,Gd fluorescent nanorods were successfully coupled to a reduced TiO2 (UCNPs@R-TiO2) nanocomposite and applied to visible-light catalytic sterilization under 980 nm near-infrared (NIR) light illumination. The UCNPs (β-NaYF4:Yb,Er,Gd) absorb the NIR light and emit red and green light. The visible light can be absorbed by the R-TiO2 (Eg = 2.8 eV) for the photocatalytic reaction. About 98.1% of Escherichia coli were effectively killed upon 12 min of NIR light irradiation at a minimum inhibitory concentration (MIC) of 40 μg/mL UCNPs@R-TiO2 nanocomposite. The bactericidal properties were further evaluated by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis. We found that the high bactericidal activity was due to the synergistic effect between the UCNPs and R-TiO2. Moreover, the UCNPs show excellent upconversion luminance properties, and the introduction of visible-light-absorbed R-TiO2 nanoparticles (2.8 eV) was conducive to the efficient separation and utilization of photogenerated electron-hole pairs. |
| Starting Page | 184 |
| e-ISSN | 20734344 |
| DOI | 10.3390/catal11020184 |
| Journal | Catalysts |
| Issue Number | 2 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-01-31 |
| Access Restriction | Open |
| Subject Keyword | Catalysts Environmental Sciences Β-nayf4:yb,er,gd Nanorods Reduced Tio2 Nanoparticles Near-infrared Light Visible Light Escherichia Coli |
| Content Type | Text |
| Resource Type | Article |
