Ce and Er Co-doped TiO2 for rapid bacteria- killing using visible light
| Autor: | Shengli Zhu, Yawei Ren, Yanqin Liang, Yajing Han, Shuilin Wu, Xiangmei Liu, Zhaoyang Li, Kelvin W.K. Yeung |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
inorganic chemicals
0206 medical engineering Biomedical Engineering Spectral response 02 engineering and technology Photocatalytic Photochemistry medicine.disease_cause Article law.invention Biomaterials law Light responsive medicine lcsh:TA401-492 Doping TiO2 Calcination lcsh:QH301-705.5 biology Chemistry technology industry and agriculture 021001 nanoscience & nanotechnology biology.organism_classification 020601 biomedical engineering Antibacterial lcsh:Biology (General) Photocatalysis lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Bacteria Co doped Ultraviolet Biotechnology Visible spectrum |
| Zdroj: | Bioactive Materials Bioactive Materials, Vol 5, Iss 2, Pp 201-209 (2020) |
| ISSN: | 2452-199X |
| Popis: | Bacterial infection and related diseases are threatening the health of human beings. Photocatalytic disinfection as a simple and low-cost disinfection strategy is attracting more and more attention. In this work, TiO2 nanoparticles (NPs) were modified by co-doping of Ce and Er using the sol–gel method, which endowed TiO2 NPs with enhanced visible light photocatalytic performance but not pure ultraviolet photocatalytic properties compared the untreated TiO2. Our results disclosed that as the doping content of Er increased, the photocatalytic activity of modified TiO2 NPs initially increased and subsequently decreased. The same trend occurred for Ce doping. When the doping dose of Er and Ce is 0.5 mol% and 0.2 mol%, the 0.5Ce0.2Ti–O calcined at 800 °C presented the best antibacterial properties, with the antibacterial efficiency of 91.23% and 92.8% for Staphylococcus aureus and Escherichia coli, respectively. The existence of Er ions is thought to successfully turn the near-infrared radiation into visible region, which is easier to be absorbed by TiO2 NPs. Meanwhile, the addition of Ce ions can effectively extend spectral response range and inhibit the recombination of electrons and holes, enhancing the photocatalytic disinfection activity of co-doped TiO2. Graphical abstract Image 1 Highlights • Er doping can turn the near-infrared radiation into the visible region. • Ce doping can broaden the light absorption of TiO2 NPs and decrease the energy gap. • Dual doping (Er&Ce) can inhibit the recombination of electrons and holes. • Dual doping (Er&Ce) can effectively enhance the photocatalytic properties of TiO2. • Er0.5Ce0.2Ti–O exhibited the best antibacterial activity under visible light. |
| Databáze: | OpenAIRE |
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