Fe3O4/ZnO/CoWO4 nanocomposites: Novel magnetically separable visible-light-driven photocatalysts with enhanced activity in degradation of different dye pollutants |
| |
| Affiliation: | 1. School of Science, Tianjin University, Tianjin 300072, China;2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China;1. Department of Chemistry, National Institute of Technology Karnataka Surathkal, Mangalore 575025, India;2. Department of Chemistry, College of Engineering and Technology, Srinivas University, Mukka, Mangalore 574146, India;1. Solid State Ionics and Energy Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641 046, India;2. Defence Metallurgical Research Laboratory, Hyderabad 500 058, India;1. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, PR China;2. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, PR China;3. Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China |
| |
| Abstract: | A series of novel magnetically separable Fe3O4/ZnO/CoWO4 nanocomposites with different contents of CoWO4 were fabricated using a facile refluxing method at 96 °C followed by a calcination step. The structure, purity, morphology, spectroscopic, and magnetic properties of the prepared samples were characterized by XRD, EDX, SEM, TEM, UV–vis DRS, FT-IR, PL, and VSM techniques. Photocatalytic activity of the nanocomposites was investigated by degradation of rhodamine B, methylene blue, methyl orange, and fuchsine under visible-light irradiation. The results showed remarkably enhanced activity for the Fe3O4/ZnO/CoWO4 (30%) nanocomposite relative to the Fe3O4/ZnO and Fe3O4/CoWO4 samples. The degradation rate constant of RhB over the optimal nanocomposite is nearly 24 and 5 times higher than those of the Fe3O4/ZnO and Fe3O4/CoWO4 samples, respectively. The intensive absorption of visible light and separation efficiency of the photogenerated electron–hole pairs in the ternary nanocomposites were confirmed by UV–vis DRS and PL techniques, respectively. In addition, a plausible mechanism for separation of the electron–hole pairs based on p–n heterojunction was proposed. |
| |
| Keywords: | Magnetic photocatalyst p–n Heterojunction Nanocomposite |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
