Synthesis of novel Au@Void@Nb2O5 core–shell nanocomposites with enhanced photocatalytic activity
| Autor: | Jiao Xue, Zongtao Zhang, Jiaquan Bai, Shilun Qiu, Runwei Wang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Nanostructure Nanocomposite Nanoparticle 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound chemistry Chemical engineering Photocatalysis engineering Rhodamine B Noble metal 0210 nano-technology Photodegradation Visible spectrum |
| Zdroj: | Dalton Transactions. 47:3400-3407 |
| ISSN: | 1477-9234 1477-9226 |
| Popis: | Nb2O5 as a semiconductor material has attracted significant attention in recent years due to its outstanding advantages. In this article, novel Au@Void@Nb2O5 core–shell nanocomposites have been fabricated through a facile sol–gel method. The construction process of this core–shell nanostructure has been presented in detail. The as-prepared core–shell nanostructure exhibits nanosphere morphology with Nb2O5 acting as the shell and Au nanoparticles acting as the core, which was proved using SEM and TEM. The noble metal Au core protected by the Nb2O5 shell promotes an interfacial charge-transfer process. The core–shell nanocomposites demonstrate excellent visible light absorption, as shown by the UV-Vis diffuse reflectance spectra. The as-prepared photocatalyst Au@Void@Nb2O5-2 calcined at 300 °C exhibits higher photocatalytic efficiency than Au@SiO2@Nb2O5-2-300 °C, Nb2O5 and P25, as evaluated by the degradation of rhodamine B (Rh B) under visible light. In the photodegradation process of the Rh B solution, holes (h+) play a more important role than hydroxyl radicals (˙OH) over the as-prepared photocatalyst, which was analyzed using active species trapping experiments and photoluminescence (PL) spectroscopy. Moreover, the photocatalyst Au@Void@Nb2O5-2 calcined at 300 °C exhibits excellent durability of its photocatalytic activity even after five successive cycles. This contribution gives a new perspective for designing and preparing novel metal-Nb2O5 nanostructure catalysts applied in environmental treatments. |
| Databáze: | OpenAIRE |
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