| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5366786 | Applied Surface Science | 2011 | 6 Pages |
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 15Â 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.
⺠Hierarchical WO3 core-shell microspheres was prepared by a facile template-free precipitation method. ⺠It eliminated disadvantages related to high cost and tedious synthetic procedures for usage of templates. ⺠The core was composed of aggregated nanoparticles encapsulated by a hierarchical shell layer self-assembled by ultrafine nanoplates. ⺠The photocatalytic activity of WO3 was explored. ⺠It shows superior photocatalytic activities for the degradation of the rhodamine B (RhB) aqueous.
