Abstract
The Ag-TiO2 hollow nanospheres with different wall thickness (Ag-TiO2-1 with a thick wall and Ag-TiO2-2 with a thin wall) were successfully prepared using polydopamine nanospheres as template. The morphologies, microstructures, crystalline structure and optical properties of the Ag-TiO2 hollow nanospheres are investigated by TEM, SEM, XRD and UV–vis spectroscopy techniques. The as-obtained Ag-TiO2 hollow nanospheres were employed as the catalysts for the photocatalytic degradation of methylene blue (MB) under visible light irradiation, indicating that such Ag-TiO2 nanocomposites exhibit better photocatalytic activity performance than pure TiO2. The enhanced photocatalytic activity of Ag-TiO2 hollow nanospheres is attributed to the effective separation of photo-generated electron-hole pairs and the efficient utilization of photons because of the long-time trapping of light in hollow structures. Importantly, the photocatalytic activity of Ag-TiO2-2 is better than that of Ag-TiO2-1. This result may be ascribed to more light absorption and faster material transfer in Ag-TiO2-2 with thin walls.
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