Electron beam irradiation treatment of Ag/Bi2WO6/CdWO4 heterogeneous material with enhanced photocatalytic activity
| Autor: | Lin Wang, Tianli Yang, Renrui Sun, Kehui Xue, Wenlei Wang, Jing Wang, Xianglin Yu, Ren He, Juntao Wang, Ting Yang |
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| Rok vydání: | 2019 |
| Předmět: |
Heterojunction
02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Silver nanoparticle 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering X-ray photoelectron spectroscopy Specific surface area Materials Chemistry Rhodamine B Photocatalysis 0210 nano-technology Ternary operation |
| Zdroj: | New Journal of Chemistry. 43:13764-13774 |
| ISSN: | 1369-9261 1144-0546 |
| Popis: | An efficient ternary heterostructure material Ag/Bi2WO6/CdWO4 was prepared via a facile hydrothermal route. The in situ loading precisely regulated the distribution of silver nanoparticles on the heterojunction surface. Besides, electron beam irradiation was used for artificially creating interface defects in the material, so the specific surface area of the material was increased. The introduction of defects was conducive for the migration of catalytically active substances towards the surface of the material. Under visible light irradiation, the degradation efficiency of the heterostructure material was improved significantly. Within 20 min, the removal efficiency of the treated material for carmine could reach about 100% (50 mL, 50 mg L−1), while that for hexavalent chromium (Cr6+), it could reach about 100% (50 mL, 10 mg L−1) within 90 min. In addition, the results showed that 4% Ag load rate had the best improvement on the photocatalytic performance of the ternary heterostructure material, irrespective of the degradation process of carmine, Cr6+ or rhodamine B (RhB). Optimum amount of supported in situ nano-silver induced resonance of the plasma on the catalytic interface and synergized with Bi3+ to improve the catalytic efficiency. PL, DRS and XPS results proved that the ternary heterostructure could effectively inhibit the rapid recombination of electron hole pairs of Ag/Bi2WO6/CdWO4. As for the role of electron beam irradiation, it could improve the content of free hydroxyl groups on the material surface and enhance the catalytic capacity of the Ag/Bi2WO6/CdWO4 heterogeneous material. A feasible reaction pathway and photocatalytic mechanism for the degradation of carmine was investigated by gas chromatography-tandem mass spectrometry (GC-MS), and the main role of ˙OH in the catalytic process was obtained by using different scavengers. |
| Databáze: | OpenAIRE |
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