Separable Magnetic Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> Composite for Adsorption and Piezo-Catalytic Degradation of Dye
Well-designed composite catalysts are of increasing concern due to their improved performance compared to individual components. Herein, we designed and synthesized an Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> composite via a simple hydrothermal method. As for t...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/79dffb21185d4b21b9507e8eee9d6217 |
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| Sumario: | Well-designed composite catalysts are of increasing concern due to their improved performance compared to individual components. Herein, we designed and synthesized an Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> composite via a simple hydrothermal method. As for the resultant composite, the MoS<sub>2</sub> nanolayers presented a novel piezo-catalytic effect, while the Fe<sub>3</sub>O<sub>4</sub> core provided a magnetic separation property. The structure and properties of Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> were determined by relevant experiments. It was found that Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> exhibited enhanced piezo-catalytic degradation of rhodamine B and good magnetic recovery/recycling features. The <i>k</i><sub>obs</sub> for rhodamine B degradation over Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> was 0.019 min<sup>−1</sup>—a little longer than that over MoS<sub>2</sub> (0.013 min<sup>−1</sup>). Moreover, Fe<sub>3</sub>O<sub>4</sub>@MoS<sub>2</sub> also showed a favorable ability to adsorb rhodamine B in solution, with a saturation adsorption of 26.8 mg/g. Further studies revealed that piezo-electrons, holes, and superoxide anions were key species in the piezo-catalytic degradation of rhodamine B. Notably, the step where oxygen trapped electrons to produce superoxide anions had a significant impact on the degradation of the dye. This work, not limited to the development of a high-performance MoS<sub>2</sub>-based piezo-catalyst, is expected to provide new insights into the working mechanisms and process profiles of composite piezo-catalysts. |
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