Preparation of three-dimensional Ag3PO4/TiO2@MoS2 for enhanced visible-light photocatalytic activity and anti-photocorrosion
| Autor: | Ning Shao, Philippe Corvini, Jinnan Wang, Dadao Wang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Chemical substance
Process Chemistry and Technology Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences law.invention chemistry.chemical_compound Magazine chemistry law Oxidizing agent Photocatalysis Methyl orange 0210 nano-technology Science technology and society Photodegradation Methylene blue General Environmental Science Nuclear chemistry |
| Zdroj: | Applied Catalysis B: Environmental. 203:964-978 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2016.11.008 |
| Popis: | We synthesized novel three-dimensional photocatalyst (Ag3PO4/TiO2@MoS2) with various content of TiO2@MoS2 by electrospining, sequential hydrothermal reaction and chemical deposition. The optimal content of TiO2@MoS2 in Ag3PO4/TiO2@MoS2 composites is 3.5 wt%, and the bandgap of Ag3PO4/TiO2@MoS2 (3.5 wt%) (1.85 eV) was much lower than that of pure Ag3PO4 (2.45 eV). Due to high conductivity of TiO2@MoS2 heterostructure, the separation efficiency of electron-hole pairs of Ag3PO4 was significantly improved so that Ag3PO4/TiO2@MoS2 (3.5 wt%) presented higher photocatalytic activity. More than 92% Methyl orange and Methylene blue were photodegraded over Ag3PO4/TiO2@MoS2 (3.5 wt%) in 12 min and 5 min, respectively. More importantly,TiO2@MoS2 could play the role of ‘wire’ to guide electrons captured by MoS2 and quickly transferred electrons into solution so that the recombination of electron-hole pairs and the reduction of silver irons were effectively restrained. Thus, Ag3PO4/TiO2@MoS2 (3.5 wt%) exhibited excellent anti-photocorrosion performance. Even after 10 cycling runs, Ag3PO4/TiO2@MoS2 (3.5 wt%) could degrade 75% and 92% of oxytetracycline and enrofloxacin, respectively, whereas Ag3PO4 degraded 23% and 44%. In addition, the possible photodegradation pathways of oxytetracycline and enrofloxacin were proposed, demonstrating that the photodegradation mechanisms involving oxidizing/shedding of functional groups firstly and opening the ring sequentially. Further detection of reactive oxidative species indicated that holes were the main active oxidizing species involved in the photocatalytic reaction process. Thus, Ag3PO4/TiO2@MoS2(3.5 wt%) is a promising photocatalyst for photodegradation of organic pollutants in the environmental protection. |
| Databáze: | OpenAIRE |
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