Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO2 Photocatalysts—A Reflection on the Importance of UV Excitability
Abstract
:1. Introduction
2. Results and Discussion
2.1. Photocatalytic Performance
2.1.1. Experiments with Visible-Light-Emitting Energy-Saving Compact Fluorescence Lamps
2.1.2. Solar Experiments
2.1.3. Photocatalytic Experiments with UV Lights and Different Colored LED Lights
2.2. Incident Photon Fluxes
2.3. Discussion of the Calculated Apparent Quantum Yields
3. Materials and Methods
3.1. Materials
3.2. Methods and Instrumentation
3.2.1. Photocatalytic Experiments
3.2.2. Potassium Ferrioxalate Actinometry
3.2.3. Light Intensity Measurements beyond the Ferrioxalate Method Validity Interval
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Irradiation Type | Initial Degradation Rate of Phenol (mol·dm−3·s−1) | |||||
---|---|---|---|---|---|---|
TiO2-AA | TiO2-FH | TiO2-P25 | TiO2-AR | TiO2-N | TiO2-VLP7000 | |
UV | 5.8·10−8 | 1.3·10−7 | 1.2·10−7 | 3.8·10−8 | 1.6·10−8 | 2.3·10−8 |
Violet | 1.8·10−9 | 5.6·10−9 | 7.0·10−9 | 1.3·10−8 | 1.0·10−8 | 1.8·10−8 |
Blue | - | 1.3·10−9 | 3.9·10−9 | 5.7·10−10 | 5.9·10−9 | 2.6·10−8 |
Green | - | - | - | - | 8.9·10−10 | 1.8·10−8 |
Yellow | - | - | - | - | - | 3.6·10−9 |
Red | - | - | - | - | - | 5.8·10−9 |
Irradiation | UV | Violet | Blue (Using 0.02 M Fe-Oxalate Solution) | Blue (Using 0.15 M Fe-Oxalate Solution) |
---|---|---|---|---|
Incident photon flux (mol·dm−3·s−1) | 9.23·10−6 | 7.75·10−6 | 4.25·10−5 | 5.16·10−5 |
Irradiation Type | Ratio of Photon Flux Belonging to Actual Irradiation and Photon Flux of Blue LED (Measured by PPF Meter) | Calculated Incident Photon Flux (mol·dm−3·s−1) |
---|---|---|
blue LED | 1.00 | 5.16·10−5 |
green LED | 0.69 | 3.56·10−5 |
yellow LED | 0.21 | 1.08·10−5 |
red LED | 1.14 | 5.88·10−5 |
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Veréb, G.; Gyulavári, T.; Virág, O.; Alapi, T.; Hernadi, K.; Pap, Z. Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO2 Photocatalysts—A Reflection on the Importance of UV Excitability. Catalysts 2022, 12, 1492. https://doi.org/10.3390/catal12121492
Veréb G, Gyulavári T, Virág O, Alapi T, Hernadi K, Pap Z. Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO2 Photocatalysts—A Reflection on the Importance of UV Excitability. Catalysts. 2022; 12(12):1492. https://doi.org/10.3390/catal12121492
Chicago/Turabian StyleVeréb, Gábor, Tamás Gyulavári, Orsolya Virág, Tünde Alapi, Klara Hernadi, and Zsolt Pap. 2022. "Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO2 Photocatalysts—A Reflection on the Importance of UV Excitability" Catalysts 12, no. 12: 1492. https://doi.org/10.3390/catal12121492