Activation Treatments and SiO2/Pd Modification of Sol–Gel TiO2 Photocatalysts for Enhanced Photoactivity under UV Radiation
Abstract
:1. Introduction
2. Results and Discussion
2.1. Colors and Compositions of Photocatalytic Samples
2.2. Crystallinity
2.3. Morphology
2.4. Optical Properties
2.5. Photocatalytic Activity
3. Materials and Methods
3.1. Photocatalyst Synthesis
3.2. Activation Treatments
3.3. Characterizations
3.4. Photocatalytic Activity on Methylene Blue Degradation
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | nSolvent (mmol) | nPd (mmol) | nEDAS (mmol) | nTIPT (mmol) | nWater (mmol) | Gelification Time (min) | Theoretical Loading SiO2/Pd (wt.%) | Actual Loading SiO2/Pd (wt.%) |
---|---|---|---|---|---|---|---|---|
Pure TiO2 | 1830 | - | - | 91.5 | 183 | 9 | - | - |
TiO2/SiO2 | 1830 | - | 6.88 | 84.6 | 180 | 8 | 5.8/0 | 4.9/0 |
TiO2/SiO2/Pd1 | 1830 | 0.69 | 1.38 | 90.1 | 182 | >60 | 0.98/1 | 1.2/1.1 |
TiO2/SiO2/Pd5 | 1830 | 3.44 | 6.88 | 84.6 | 180 | 40 | 4.9/5 | 4.7/4.2 |
TiO2/SiO2/Pd12 | 1830 | 8.60 | 17.20 | 74.3 | 174 | >60 | 11.76/12 | 12.9/12.2 |
TiO2/SiO2/Pd22 | 1830 | 17.4 | 34.90 | 56.6 | 166 | >60 | 21.56/22 | 24.6/21.8 |
Sample | dXRDTi (nm) ±1 | dXRDPdO (nm) ±1 | dXRDPd (nm) ±1 | SBET (m2 g−1) ±5 | VDR (cm3 g−1) ±0.01 | VP (cm3 g−1) ±0.1 | dTEMTi (nm) ±5 | dTEMPdO (nm) ±4 | dTEMPd (nm) ±4 | Eg (eV) ±0.01 |
---|---|---|---|---|---|---|---|---|---|---|
Pure TiO2 | 34 | -b | -b | <5 | - | 0.04 | 25 | -b | -b | 3.17 |
Pure TiO2-H2 | 34 | -b | -b | <5 | - | 0.04 | -a | -b | -b | 3.16 |
Pure TiO2-UV | 34 | -b | -b | <5 | - | 0.04 | 25 | -b | -b | 3.25 |
TiO2/SiO2 | 8 | -b | -b | 100 | 0.04 | 0.2 | 10 | -b | -b | 3.25 |
TiO2/SiO2-H2 | 10 | -b | -b | 145 | 0.06 | 0.4 | -a | -b | -b | 3.23 |
TiO2/SiO2-UV | 8 | -b | -b | 100 | 0.04 | 0.2 | 10 | -b | -b | 3.27 |
TiO2/SiO2/Pd1 | 19 | -c | -b | 40 | 0.02 | 0.1 | 18 | -c | -b | -d |
TiO2/SiO2/Pd1-H2 | 25 | -b | -c | 60 | 0.02 | 0.2 | -a | -b | -c | -d |
TiO2/SiO2/Pd1-UV | 19 | -c | -b | 40 | 0.02 | 0.1 | 18 | -c | -b | -d |
TiO2/SiO2/Pd5 | 11 | 8 | -b | 45 | 0.02 | 0.2 | 12 | 8 | -b | -d |
TiO2/SiO2/Pd5-H2 | 11 | -b | 17 | 60 | 0.02 | 0.2 | -a | -b | 10 | -d |
TiO2/SiO2/Pd5-UV | 10 | 8 | -b | 45 | 0.02 | 0.2 | 12 | 9 | -b | -d |
TiO2/SiO2/Pd12 | 7 | 17 | -b | 20 | 0.01 | 0.6 | 10 | 12 | -b | -d |
TiO2/SiO2/Pd12-H2 | 6 | -b | 9 | 25 | 0.01 | 0.4 | -a | -b | 11 | -d |
TiO2/SiO2/Pd12-UV | 7 | 17 | -b | 20 | 0.01 | 0.6 | 10 | 12 | -b | -d |
TiO2/SiO2/Pd22 | -b | 25 | -b | 45 | 0.02 | 0.4 | -b | 14 | -b | -d |
TiO2/SiO2/Pd22-H2 | -b | -b | 12 | 100 | 0.05 | 0.1 | -b | -b | 11 | -d |
TiO2/SiO2/Pd22-UV | -b | 25 | -b | 45 | 0.02 | 0.4 | -b | 14 | -b | -d |
Sample | MB Adsorption after 6 h (Blank Test—%) ±5 | MB Conversion after 6 h (Blank Deduced—%) ±5 | Kinetic Constant k (h−1) |
---|---|---|---|
Pure TiO2 | 0 | 35 | 0.069 |
Pure TiO2-H2 | 5 | 50 | 0.116 |
Pure TiO2-UV | 0 | 45 | 0.092 |
TiO2/SiO2 | 50 | 50 | 0.119 |
TiO2/SiO2-H2 | 60 | 40 | 0.082 |
TiO2/SiO2-UV | 15 | 85 | 0.333 |
TiO2/SiO2/Pd1 | 0 | 60 | 0.147 |
TiO2/SiO2/Pd1-H2 | 15 | 75 | 0.233 |
TiO2/SiO2/Pd1-UV | 0 | 35 | 0.070 |
TiO2/SiO2/Pd5 | 0 | 55 | 0.131 |
TiO2/SiO2/Pd5-H2 | 5 | 60 | 0.147 |
TiO2/SiO2/Pd5-UV | 0 | 35 | 0.069 |
TiO2/SiO2/Pd12 | 20 | 25 | 0.039 |
TiO2/SiO2/Pd12-H2 | 15 | 30 | 0.059 |
TiO2/SiO2/Pd12-UV | 15 | 25 | 0.050 |
TiO2/SiO2/Pd22 | 10 | 15 | 0.030 |
TiO2/SiO2/Pd22-H2 | 10 | 0 | 0.005 |
TiO2/SiO2/Pd22-UV | 10 | 0 | 0.000 |
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Mahy, J.G.; Sotrez, V.; Tasseroul, L.; Hermans, S.; Lambert, S.D. Activation Treatments and SiO2/Pd Modification of Sol–Gel TiO2 Photocatalysts for Enhanced Photoactivity under UV Radiation. Catalysts 2020, 10, 1184. https://doi.org/10.3390/catal10101184
Mahy JG, Sotrez V, Tasseroul L, Hermans S, Lambert SD. Activation Treatments and SiO2/Pd Modification of Sol–Gel TiO2 Photocatalysts for Enhanced Photoactivity under UV Radiation. Catalysts. 2020; 10(10):1184. https://doi.org/10.3390/catal10101184
Chicago/Turabian StyleMahy, Julien G., Valériane Sotrez, Ludivine Tasseroul, Sophie Hermans, and Stéphanie D. Lambert. 2020. "Activation Treatments and SiO2/Pd Modification of Sol–Gel TiO2 Photocatalysts for Enhanced Photoactivity under UV Radiation" Catalysts 10, no. 10: 1184. https://doi.org/10.3390/catal10101184