Surface Properties and Photocatalytic Activity of KTaO3, CdS, MoS2 Semiconductors and Their Binary and Ternary Semiconductor Composites
Abstract
:1. Introduction
2. Results and Discussion
2.1. BET Surface Area
Sample Label | KTaO3:CdS:MoS2/Molar Ratio | Preparation Method | BET Surface Area/[m2/g] | Pore Volume/[cm3/g] |
---|---|---|---|---|
KTaO3 | 1:0:0 | hydrothermal | 0.1 | 0.0001 |
CdS | 0:1:0 | solvothermal | 1.2 | 0.0006 |
MoS2 | 0:0:1 | hydrothermal | 1.8 | 0.0009 |
CdS-MoS2 5-1 | 0:5:1 | solvothermal mixed solutions | 5.0 | 0.0026 |
CdS-MoS2 4-1 | 0:4:1 | solvothermal mixed solutions | 11.1 | 0.0056 |
CdS-MoS2 1-1 | 0:1:1 | solvothermal mixed solutions | 10.4 | 0.0052 |
CdS-MoS2 1-5 | 0:1:5 | solvothermal mixed solutions | 1.0 | 0.0006 |
KTaO3-CdS 10-1_MS | 10:1:0 | solvothermal mixed solutions | 17.5 | 0.0088 |
KTaO3-CdS 10-1_C | 10:1:0 | hydro/solvothermal and calcination | 0.4 | 0.0002 |
KTaO3-MoS2 10-1_MS | 10:0:1 | hydrothermal mixed solutions | 2.8 | 0.0014 |
KTaO3-MoS2 10-1_C | 10:0:1 | hydrothermal and calcination | <0.1 | ~0 |
KTaO3-CdS-MoS2 10-1-1_MS | 10:1:1 | solvothermal mixed solutions | 4.0 | 0.0019 |
KTaO3-CdS-MoS2 10-1-1_C | 10:1:1 | hydro/solvothermal and calcination | <0.1 | ~0 |
KTaO3-CdS-MoS2 10-5-1_MS | 10:5:1 | solvothermal mixed solutions | 10.3 | 0.0051 |
KTaO3-CdS-MoS2 10-5-1_C | 10:5:1 | hydro/solvothermal and calcination | 0.5 | 0.0003 |
2.2. XRD Analysis
2.3. Morphology
2.4. UV-Vis Properties
2.5. The Photocatalytic Degradation of Phenol in the Aqueous Phase
2.6. The Photocatalytic Degradation of Toluene in the Gas Phase
Sample Label | Phenol Degradation Rate under UV-Vis/(µmol·dm−3·min−1) | Toluene Degradation after 1 h Irradiation (LEDs, λmax = 375 nm) [%] | |||
---|---|---|---|---|---|
1st Cycle | 2nd Cycle | 3rd Cycle | 4th Cycle | ||
KTaO3 | 0.79 | 64 | 63 | 42 | 37 |
CdS | 0.61 | 57 | 57 | 57 | 52 |
MoS2 | 0.90 | 46 | 23 | 22 | 22 |
CdS-MoS2 1-5 | 0.77 | 57 | 53 | 44 | 27 |
CdS-MoS2 1-1 | 0.62 | 61 | 53 | 62 | 52 |
CdS-MoS2 5-1 | 0.81 | 70 | 60 | 49 | 48 |
CdS-MoS2 4-1 | 1.41 | 53 | 56 | 60 | 62 |
KTaO3-CdS 10-1_MS | 2.08 | 47 | 45 | 41 | 40 |
KTaO3-CdS 10-1_C | 1.75 | 53 | 48 | 52 | 50 |
KTaO3-MoS2 10-1_MS | 1.69 | 55 | 51 | 49 | 51 |
KTaO3-MoS2 10-1_C | 0.55 | 46 | 34 | 37 | 35 |
KTaO3-CdS-MoS2 10-1-1_MS | 1.15 | 50 | 52 | 48 | 39 |
KTaO3-CdS-MoS2 10-1-1_C | 1.11 | 53 | 54 | 49 | 40 |
KTaO3-CdS-MoS2 10-5-1_MS | 1.99 | 50 | 41 | 43 | 41 |
KTaO3-CdS-MoS2 10-5-1_C | 2.81 | 48 | 48 | 50 | 46 |
TiO2 (P25) | 2.87 | 98 | 96 | 95 | 95 |
2.7. The Origin of Photocatalytic Activity
3. Experimental
3.1. Materials and Instruments
3.2. Synthesis of Single KTaO3, CdS and MoS2 Semiconductors
3.3. Synthesis of Binary and Ternary Semiconductor Composites
3.4. Measurement of Photocatalytic Activity in the Aqueous Phase
3.5. Measurement of Photocatalytic Activity in the Gas Phase
4. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Bajorowicz, B.; Cybula, A.; Winiarski, M.J.; Klimczuk, T.; Zaleska, A. Surface Properties and Photocatalytic Activity of KTaO3, CdS, MoS2 Semiconductors and Their Binary and Ternary Semiconductor Composites. Molecules 2014, 19, 15339-15360. https://doi.org/10.3390/molecules190915339
Bajorowicz B, Cybula A, Winiarski MJ, Klimczuk T, Zaleska A. Surface Properties and Photocatalytic Activity of KTaO3, CdS, MoS2 Semiconductors and Their Binary and Ternary Semiconductor Composites. Molecules. 2014; 19(9):15339-15360. https://doi.org/10.3390/molecules190915339
Chicago/Turabian StyleBajorowicz, Beata, Anna Cybula, Michał J. Winiarski, Tomasz Klimczuk, and Adriana Zaleska. 2014. "Surface Properties and Photocatalytic Activity of KTaO3, CdS, MoS2 Semiconductors and Their Binary and Ternary Semiconductor Composites" Molecules 19, no. 9: 15339-15360. https://doi.org/10.3390/molecules190915339