Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials and Chemicals
2.2. Synthesis of Spherical Bi2WO6 Nanostructures
2.3. Synthesis of Bi2WO6/Bi2S3/MoS2 n-p Heterojunction Photocatalyst
2.4. Characterization
2.5. Photocatalytic Activity Experiments
3. Results and Discussion
3.1. X-ray Diffraction (XRD) and Raman Analysis
3.2. Morphology
3.3. X-ray Photoelectron Spectroscopy (XPS) Analysis
3.4. Brunauer–Emmett–Teller (BET) Specific Surface Area Analysis
3.5. Ultraviolet–Visible (UV–Vis) Absorption and Band Gap Positions
3.6. Photoelectrochemical Performance
3.7. Photocatalytic Activity
3.8. Possible Photocatalytic Mechanism
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Materials | Eg (eV) | X (eV) | Ee (eV) | ECB vs. NHE 1 (eV) | EVB vs. NHE 1 (eV) |
---|---|---|---|---|---|
Bi2WO6 | 2.74 | 6.20 | 4.50 | 0.33 | 3.07 |
Bi2S3 | 1.19 [51] | 5.27 | 4.50 | 0.18 | 1.37 |
MoS2 | 1.30 | 5.32 | 4.50 | 0.17 | 1.47 |
Materials/Amount (mg) | Cr(VI) Solution Volume (mL)/Concentration (mg L−1) | Time (min) | Photocatalytic Removal Rate | Publication Date | Ref. |
---|---|---|---|---|---|
CoS2/g-C3N4-rGO/10 | 20/20 | 120 | 99.8 | 2020 | [63] |
MoSe2/ZnO/ZnSe/80 | 80/20 | 180 | 100 | 2020 | [67] |
rGO/ZnO/Au/50 | 50/10 | 40 | 97 | 2020 | [68] |
Bi2MoO6/ZnO/100 | 50/50 | 150 | 100 | 2019 | [61] |
RGO/BiOI/ZnO/100 | 150/10 | 180 | 92 | 2019 | [69] |
Bi2WO6+Oxalic/60 | 50/10 | 120 | 100 | 2018 | [70] |
CuInS2 QDs/Bi2WO6/20 | 40/10 | 300 | 90 | 2018 | [71] |
Bi2WO6/MoS2/RGO+Lactic acid/30 | 100/10 | 80 | 100 | 2016 | [72] |
Bi2WO6/Bi2S3/MoS2/20 | 50/40 | 75 | 100 | This work |
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Ren, J.; Hu, T.; Gong, Q.; Wang, Q.; Sun, B.; Gao, T.; Cao, P.; Zhou, G. Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity. Nanomaterials 2020, 10, 1813. https://doi.org/10.3390/nano10091813
Ren J, Hu T, Gong Q, Wang Q, Sun B, Gao T, Cao P, Zhou G. Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity. Nanomaterials. 2020; 10(9):1813. https://doi.org/10.3390/nano10091813
Chicago/Turabian StyleRen, Jing, Tingting Hu, Qinghua Gong, Qian Wang, Bin Sun, Tingting Gao, Pei Cao, and Guowei Zhou. 2020. "Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity" Nanomaterials 10, no. 9: 1813. https://doi.org/10.3390/nano10091813