Metal-Free Carbon Quantum Dots Implant Graphitic Carbon Nitride: Enhanced Photocatalytic Dye Wastewater Purification with Simultaneous Hydrogen Production
| Autor: | Hong Chen, Xia Yin, Xianghui Liu, Menghan Xun, Lilei Zhang, Jingxiao Zhang, Yuanyu Xia |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
hydrogen production
carbon quantum dot Electrons 02 engineering and technology Wastewater 010402 general chemistry 01 natural sciences Article wastewater purification Catalysis lcsh:Chemistry Inorganic Chemistry chemistry.chemical_compound Quantum Dots Rhodamine B Physical and Theoretical Chemistry Nitrogen Compounds Photodegradation lcsh:QH301-705.5 Molecular Biology Spectroscopy Hydrogen production Organic Chemistry Graphitic carbon nitride Prostheses and Implants General Medicine 021001 nanoscience & nanotechnology graphitic carbon nitride Carbon 0104 chemical sciences Computer Science Applications lcsh:Biology (General) lcsh:QD1-999 chemistry Chemical engineering Metals Hydrogen fuel Photocatalysis Graphite 0210 nano-technology photocatalysis Hydrogen |
| Zdroj: | International Journal of Molecular Sciences International Journal of Molecular Sciences, Vol 21, Iss 3, p 1052 (2020) Volume 21 Issue 3 |
| ISSN: | 1422-0067 |
| DOI: | 10.3390/ijms21031052 |
| Popis: | The use of photocatalysts to purify wastewater and simultaneously convert solar energy into clean hydrogen energy is of considerable significance in environmental science. However, it is still a challenge due to their relatively high costs, low efficiencies, and poor stabilities. In this study, a metal-free carbon quantum dots (CQDs) modified graphitic carbon nitride photocatalyst (CCN) was synthesized by a facile method. The characterization and theoretical calculation results reveal that the incorporation of CQDs into the g-C3N4 matrix significantly improves the charge transfer and separation efficiency, exhibits a redshift of absorption edge, narrows the bandgap, and prevents the recombination of photoexcited carriers. The hydrogen production and simultaneous degradation of methylene blue (MB) or rhodamine B (RhB) in simulated wastewaters were further tested. In the simulated wastewater, the CCN catalyst showed enhanced photodegradation efficiency, accompanied with the increased hydrogen evolution rate (1291 µmol·h−1·g−1). The internal electrical field between the g-C3N4 and the CQDs is the main reason for the spatial separation of photoexcited electron-hole pairs. Overall, this work could offer a new protocol for the design of highly efficient photocatalysts for dye wastewater purification with simultaneous hydrogen production. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |