Influence of rGO and Preparation Method on the Physicochemical and Photocatalytic Properties of TiO2/Reduced Graphene Oxide Photocatalysts
Abstract
:1. Introduction
2. Results and Discussion
2.1. Characterization of Photocatalysts
2.1.1. UV–Vis Diffuse Absorbance Spectroscopy
2.1.2. X-ray Diffraction Analysis
2.1.3. BET Analysis
2.1.4. SEM Image Analysis
2.1.5. Raman Analysis
2.1.6. Thermal Analysis
2.1.7. XPS Analysis
2.1.8. Carbon Content
2.2. Adsorption Experiment
2.3. Photocatalytic Activity Test
2.4. Photocatalyst Stability
2.5. Photocatalytic Mechanism
3. Materials and Methods
3.1. Materials
3.2. Preparation of Photocatalysts
3.3. Characterization of Photocatalysts
3.4. Adsorption Experiment
3.5. Photocatalytic Activity Measurements
3.6. Reusability Test
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Sample Code | Crystalline Phase Participation (%) | Anatase | Rutile | Eg (eV) | |||
---|---|---|---|---|---|---|---|
Anatase | Rutile | FWHM 2θ = 25.4 (°) | dA a (nm) | FWHM 2θ = 27.7 (°) | dR a nm) | ||
KRONOClean 7000 | 100 | 0 | 0.88 | 11 | - | - | 3.29 |
TiO2 | 98 | 2 | 0.55 | 18 | 0.34 | 32 | 3.28 |
TiO2/rGO | 99 | 1 | 0.58 | 17 | 0.37 | 27 | 3.28 |
TiO2/rGO-300 | 98 | 2 | 0.53 | 19 | 0.34 | 33 | 3.27 |
TiO2/rGO-400 | 98 | 2 | 0.53 | 19 | 0.32 | 29 | 3.28 |
TiO2/rGO-500 | 96 | 3 | 0.47 | 22 | 0.24 | 93 | 3.28 |
TiO2/rGO-600 | 97 | 3 | 0.38 | 29 | 0.30 | 140 * | 3.26 |
TiO2/rGO-700 | 76 | 24 | 0.31 | 38 | 0.13 | 176 * | 2.99 |
TiO2/rGO-800 | 3 | 97 | 0.22 | 65 | 0.12 | 272 * | 2.97 |
TiO2/rGO-900 | 0 | 100 | - | - | 0.12 | 281 * | 2.97 |
TiO2-300 | 99 | 1 | 0.55 | 18 | 0.35 | 32 | 3.27 |
TiO2-500 | 99 | 1 | 0.42 | 26 | 0.27 | 47 | 3.29 |
TiO₂-700 | 28 | 72 | 0.24 | 58 | 0.13 | 235 * | 3.02 |
TiO₂-800 | 1 | 99 | 0.17 | 105 | 0.12 | 338 * | 3.01 |
TiO2-900 | 0 | 100 | - | - | 0.11 | 423 * | - |
Sample Code | SBET (m2/g) | Vtotal a (cm3/g) | Vmicro b (cm3/g) | Vmeso c (cm3/g) | Carbon Content (wt%) |
---|---|---|---|---|---|
KRONOClean 7000 | 249 | 0.37 | 0.09 | 0.28 | 0.96 |
TiO2 | 97 | 0.40 | 0.04 | 0.36 | 0.6 |
TiO2/rGO | 142 | 0.42 | 0.04 | 0.38 | 6.5 |
TiO2/rGO-300 | 134 | 0.44 | 0.04 | 0.40 | 5.8 |
TiO2/rGO-400 | 117 | 0.35 | 0.04 | 0.31 | 5.9 |
TiO2/rGO-500 | 114 | 0.41 | 0.04 | 0.37 | 5.9 |
TiO2/rGO-600 | 63 | 0.75 | 0.03 | 0.72 | 6.0 |
TiO2/rGO-700 | 58 | 0.24 | 0.02 | 0.22 | 5.7 |
TiO2/rGO-800 | 23 | 0.08 | 0.01 | 0.07 | 5.9 |
TiO2/rGO-900 | 21 | 0.04 | 0.01 | 0.03 | 5.4 |
TiO2-300 | 112 | 0.30 | 0.04 | 0.26 | - |
TiO2-500 | 78 | 0.23 | 0.03 | 0.20 | - |
TiO₂-700 | 15 | 0.05 | 0.004 | 0.046 | - |
TiO2-900 | 4 | 0.04 | 0.01 | 0.03 | - |
rGO | 310 | 0.32 | 0.12 | 0.20 | 75 |
Sample Code | C 1s Components (Total C 1s Intensity = 100) | |||||
---|---|---|---|---|---|---|
C−Cgraph | C−Caliph | C−OH | C=O | CO(O) | π→π* | |
rGO | 57 | 21 | 8 | 4 | 4 | 6 |
TiO2/rGO-300 | 54 | 26 | 6 | 3 | 11 | - |
TiO2/rGO-500 | 53 | 27 | 7 | 2 | 11 | - |
TiO2/rGO-700 | 56 | 29 | 7 | 1 | 7 | - |
TiO2/rGO-900 | 60 | 21 | 7 | 3 | 2 | 7 |
Sample Code | UV Irradiation | Artificial Solar Light | ||
---|---|---|---|---|
Degree of Adsorption (%) | Degree of MB Decomposition after 90 min (%) | Degree of Adsorption (%) | Degree of MB Decomposition after 300 min (%) | |
KRONOClean 7000 | 2.1 | 29.14 | 3.01 | 3.36 |
TiO2 | 2.9 | 38.78 | 1.11 | 1.02 |
TiO2/rGO-700 | 62.29 | 100.00 | 53.37 | 32.13 |
TiO2-700 | 11.78 | 86.48 | 9.24 | 7.11 |
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Wanag, A.; Kusiak-Nejman, E.; Czyżewski, A.; Moszyński, D.; Morawski, A.W. Influence of rGO and Preparation Method on the Physicochemical and Photocatalytic Properties of TiO2/Reduced Graphene Oxide Photocatalysts. Catalysts 2021, 11, 1333. https://doi.org/10.3390/catal11111333
Wanag A, Kusiak-Nejman E, Czyżewski A, Moszyński D, Morawski AW. Influence of rGO and Preparation Method on the Physicochemical and Photocatalytic Properties of TiO2/Reduced Graphene Oxide Photocatalysts. Catalysts. 2021; 11(11):1333. https://doi.org/10.3390/catal11111333
Chicago/Turabian StyleWanag, Agnieszka, Ewelina Kusiak-Nejman, Adam Czyżewski, Dariusz Moszyński, and Antoni W. Morawski. 2021. "Influence of rGO and Preparation Method on the Physicochemical and Photocatalytic Properties of TiO2/Reduced Graphene Oxide Photocatalysts" Catalysts 11, no. 11: 1333. https://doi.org/10.3390/catal11111333