One-step mechanochemical synthesis of plasmonic Ag/Zn–Al LDH with excellent photocatalytic activity
| Autor: | Qiwu Zhang, Xinzhong Liu, Huimin Hu, Lei Wu, Zhao Li, Yue Zhao |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Mechanical Engineering Schottky barrier 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Metal chemistry.chemical_compound Adsorption Chemical engineering chemistry Mechanics of Materials visual_art visual_art.visual_art_medium engineering Methyl orange Photocatalysis Hydroxide General Materials Science Noble metal Surface plasmon resonance 0210 nano-technology |
| Zdroj: | Journal of Materials Science. 53:12795-12806 |
| ISSN: | 1573-4803 0022-2461 |
| Popis: | A series of Ag/Zn–Al layered double hydroxide composites were successfully synthesized by a mechanochemical method, and their photocatalytic activity as methyl orange (MO) degradation was investigated. The nanoscale composites showed excellent photocatalytic activity and enabled simply over 95% degradation of MO under visible light irradiation in 180 min. Based on the results from EIS and PL analyses, the enhancement of photocatalytic efficiency was mainly attributed to the surface plasmon resonance effect of Ag nanoparticles and the Schottky barrier between Ag and LDH, with efficient adsorption of resonant photons on the composites and subsequent electron transfer to the conduction band of LDH to promote the separation efficiency of photogenerated electrons and holes. 4%Ag/LDH exhibited the highest photocatalytic activity with high stability after multiple running cycles. The electron spin resonance revealed that ·OH was the dominant active species in the photocatalysis process. Considering the limited choice of soluble noble metal salts to serve as starting samples for loading preparation, this work allowed the direct use of Ag metal instead of very expensive soluble salts for sample preparation, providing a facile novel green and nonthermal method to assemble metal–semiconductor combination by co-grinding metal element with semiconductor raw materials. |
| Databáze: | OpenAIRE |
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