Facile synthesis and photocatalytic activity of hierarchical WO3 core–shell microspheres
| Autor: | Lianxing Li, Liang Zhang, Xincun Tang, Zhimin Wang, Yuanhua Xiao, Zhouguang Lu |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Precipitation (chemistry) Scanning electron microscope General Physics and Astronomy Nanoparticle Nanotechnology Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Thermogravimetry chemistry.chemical_compound Differential scanning calorimetry Chemical engineering chemistry Transmission electron microscopy Photocatalysis Rhodamine B |
| Zdroj: | Applied Surface Science. 258:1719-1724 |
| ISSN: | 0169-4332 |
| Popis: | In this work, we present a facile template-free precipitation method for the large-scale preparation of hierarchical WO3 core–shell microspheres in which the core was composed of aggregated nanoparticles encapsulated by a hierarchical shell layer self-assembled by ultrafine nanoplates with a thickness of about 15 nm. The products are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), differential scanning calorimetry and thermogravimetry (TG/DSC). The experimental parameters affecting the morphology were discussed in detail. We found that the concentration of citric acid and pH value of the reaction solution had profound effects on the morphology of the products. In addition, a formation mechanism was proposed for producing hierarchical WO3 core–shell microspheres. Furthermore, the obtained hierarchical WO3 core–shell microspheres showed superior photocatalytic activities for the degradation of rhodamine B (RhB) under visible light irradiation. |
| Databáze: | OpenAIRE |
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